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techtalk:ih:oil06 [2024/01/01 22:52]
– hippysmack |
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techtalk:ih:oil06 [2024/01/02 03:05] (current)
– hippysmack |
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| ====== Oil Leaks ====== |
| ===== Sub Documents ===== |
|
| * [[techtalk:ih:oil06a|Click Here]] for the article "Dr Dick on Oil Leaks". |
|
|
|
| ====== Diagnosing Oil Consumption ====== |
|
| * **The service manuals say to use the proper grade of oil for the lowest temperature expected until the next oil change**. |
| * The FSMs assume a lot of oil is going out thru the chain oiler. That's why some people simply plug it. |
|
|
| ====== Visual Inspection ====== |
| \\ |
| ===== Rocker Box / Gaskets ===== |
|
| * **Rocker shaft bolt heads**: |
| * These are very short bolts. Each has an O-ring behind it which needs to be replaced if leaking. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/79523-help-with-an-oil-leak?t=578087)) |
|
|
| ===== Rocker Oil Lines ===== |
|
| * **Leaky rocker box oil line fittings**. |
| * You may not have to replace any parts to fix a leak at the fittings. You can un-install the fittings, clean, inspect, re-install and see what happens. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/183535-earl-leak?t=1974660)) |
|
|
| ===== Air Cleaner / Filter ===== |
|
| * **Oil puking and oil seepage out the air cleaner are different conditions**. |
| * You'll know it if it pukes as there will be a good puddle of oil on the shop floor or gobs of oil running rearward of the A/C all over the bike. \\ This is a sign of too much oil added to the system or wetsumping. |
|
|
| ===== Pushrod Tubes ===== |
|
| * **Verifying a pushrod tube leak and what portion**. |
| * Make a sandwich: ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/190246-can-t-stop-front-exhaust-pushrod-tube-leak/page3?t=2027963&page=3)) |
|
|
| ===== Head Gaskets / Bolts ===== |
|
| * DO NOT try to simply tighten the head or rocker bolts that may be loose. \\ All multiple bolt fasteners are required to be torqued in a cross pattern. \\ Likewise, simply tightening only the bolts that are loose will change the clamp load on the ones that are tight and not touched. \\ If you feel it's simply a loose bolt, loosen all the bolts on the rocker box / head / etc. \\ Then torque them back using the correct specs and tightening sequence. \\ |
|
| ===== Cylinders / Rings / Base Gaskets ===== |
|
| * **Piston ring material**. |
| * Ductile, Cast, Moly faced, etc. |
* A cast oil ring causes wall wear and is terrible at oil control. The 3 piece oil rings are better. ((Dr Dick of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.php?p=5106190sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/173895-xlch-vs-xlh-piston/page2#post5106190post3726322)) |
| * **Honing the cylinders**. |
| * You need a 45° or 60° cross hatch pattern on the cylinder walls (400 or 600 stone). |
|
| ===== Engine Case Seam ===== |
|
| * **Installation error**. |
| * The case halves are put together with sealant (not gaskets). \\ It is possible, when mating the left and right case halves, to not spread the sealant evenly and create a future leak. \\ Too thin in some places and too thick in others. If the bolts are not properly torqued, this could leave gaps in the sealing surfaces. |
| * **Motor mount bolts may appear to be leaking oil when the oil is actually coming from the case seam around the bolts**. |
* The bolts don't actually enter the case but rather through bosses on the outside of the case. \\ One practice to seal up old case seam leaks at the bolt holes has been to remove the bolts, add silicone to the threads and reinstall the bolts. ((steelworker of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/124905-can-eng-oil-leak-from-eng-mount-bolt-on-evo/page2?t=1250708&page=2)) \\ So if you are leaking out the bolt holes, someone may have smeared sealant on the bolt to make up for the failure of the case seam there. \\ This patch will not in itself cause any harm and may well hold up, but it is not right. \\ The alternative is to completely strip the engine and re-seal the cases. |
| * Officially, the cases need to be split and the joint re-sealed. |
| * **Make sure it's the case seam leaking before making any repairs**. |
|
|
| ===== Oil Pump ===== |
|
| \\ |
| ===== Oil Tank / Lines and Connections ===== |
|
| * **If you have an oil leak from anywhere, the oil tank is subject to having oil all over it**. |
| * It is an accumulation of spills from filling, blowback from engine gaskets / seals / breathers and road grunge. |
| * **The best way to find out if the oil tank is leaking is to clean it up** (try some blue dawn and a nylon brush). \\ (and use some spray SOFT-N-DRI or talcum powder in the area) See [[techtalk:ih:oil06#leaking_with_engine_running_weeping_gaskets|Leaking with Engine Running]] below. |
| * **83-93 oil tanks are prone to cracking and leaking where the oil tank and battery tray are connected**. |
* Fractures were due to poorly supporting the weight of the battery. ((Four Speed of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/frame-mount-evo-sportster-talk-1986-2003-models/183021-1986-90-evo-sportsters-what-every-owner-should-know-but-were-afraid-to-ask?t=1971026)) \\ Harley offered 62472-93A and 62482-93A oil tank upgrade kits for replacement (94-96 tank assembly). \\ However, the original oil tank can be reinforced and welded. |
| * **Periodically inspect all oil hose connections for leaks or cracks / deteriation, especially before long rides**. |
| * Replace any lines that are cracked. |
* They have been known to have the inner rubber come loose and form a sort of flap valve inside the oil line. ((Hopper of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/153442-breather-spitting-too-much-oil/page2?t=1651226&highlight=slinger&page=2)) |
| * **Restricted oil tank vent line**. |
* Our bikes have 2 oil pumps. A supply pump (the skinny gear set) & a return pump (the thicker gears). ((Dr Dick of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/124646-oil-pump-vent-purpose-function/page2?t=1244538&page=2)) \\ The return pump has a larger flow than the supply pump. This is to make sure any oil that get pumped in definitely gets pumped back out. \\ If you watch the return oil as it goes back to the tank you will see it returns in "spurts". \\ The oil part of the spurts matches the amount that the feed is pulling from tank. \\ That's why the oil level in the tank remains the same while the bike is running. \\ The air part of the spurts is the extra cap of the return pump over the supply. \\ So the return would pressurize the tank because it's pumping this extra air back. \\ Air pressure in the tank is relieved thru the vent line back to the camcase where it came from in the 1st place. \\ That's why the vent line is always the highest one on the tank so it's above the oil level. \\ If it was below the oil level, oil would be forced into the camcase causing wetsumping. |
| * Oil carry over may occur while driving the vehicle at highway speeds. The amount of carry over is directly related to the amount of restriction. ((HD Tech Tips dated November 8, 1985)) \\ More restriction equals more carryover. \\ In most cases the restriction is minor and translates to a small amount of carry over, which if left alone creates a bothersome mess. \\ Start looking for pinched hoses or a restrictive oil filter. \\ Pull the line off at the tank and make sure you can blow through it into the cam gear case. \\ Then blow through the oil tank fitting with the lid off and make sure that path is clear. |
|
| ===== Chain Oiler (57-76) ===== |
|
| The chain oiler is a designed leak to keep the chain from rusting up. \\ |
| Most will either plug the oiler fitting with a bolt / screw or remove the oiler fitting and install an 1/8"x27 NPT plug there and oil the chain by other means. \\ |
|
| ===== Cam Cover or Primary Cover ===== |
|
| * **Loose bolts or a worn gasket**. \\ Caution, tightening loose bolts on the cover without using the proper torque sequence can warp the cover. \\ If you find loose bolts, loosen all of them and re-torque the entire set using the correct sequence and torque specs. |
| * **Remove the cover and check it for warpage**. |
|
| * You may be able to file down slight warped areas. If not, you may need to replace the cover. |
| * **Inspect the cover for hairline cracks**. |
* These are notorious for hairline fractures where the bolts go that can produce a leak. ((gunterjaeger of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/103214-oil-leak-coming-from-engine-case?t=905055)) \\ Even the primary chain, prior to needing adjustment, can hit those areas and create a leak. \\ If there is a crack evident, you may be able to fill the bolt hole with gasket maker (not silicone) or have it brazed. |
* If it is a top bolt, it is not sitting in oil. ((wedge of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/103214-oil-leak-coming-from-engine-case?t=905055)) \\ So it is leaking oil that has been flung on it, which means it's coming from a place that is less likely to leak. \\ Leaks up top are more likely to be seepage rather than dripage. \\ So a crack is good possibility if the bolts up top are tight and the gasket is good. \\ If it's not coming out of the gasket joint, but rather the bolt; \\ The leak is coming through the part of the gasket that wraps around the inside edge of the bolt. \\ (rather than the side that is visible as you look at the edge of the gasket) \\ Or through the bolt threads if that hole is not a blind hole but rather a hole that goes all the way into the primary. \\ Also, check the transmission vent (77-up) line before doing anything else. A clogged vent can force oil out of places that you wouldn't believe. |
| * **Modifications to the cover**. |
| * If your cam cover has been modified on the bottom, there is a rifling hole there for a drilled oil passage running vertically thru the cover. \\ If the cover was cut / sanded close to this factory welded up hole, it could break thru and leak. \\ If it was cut thru and siliconed / epoxied shut, the sealant could be leaking oil. \\ See also [[techtalk:ref:engmech03e|Chopping the Cam / Gearcase Cover]] in the Sportsterpedia. |
|
| * Oil can appear to be coming from the primary or case seam when it's actually leaking from the starter mount gasket. |
| * **Shifter Shaft Seal**. |
* There is a thrust washer (35404-74) (VTwin #10-1259) on the shifter shaft (washer is .030" thick). ((IronMick of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/179201-late-84-question?t=1925445&highlight=shift+leak)) \\ It often gets lost (overlooked) because it oil-sticks to the primary cover and goes unnoticed. |
| * **#2 cam seal in cover**. |
| * There's a seal (11124) pressed into the cam cover that seals the nosecone behind the points or ignition plate. \\ It can seep leaving oil just in the nosecone or leak out the cover. |
* __Look for ID leaks__; a marred cam journal, seal lip not getting up on the full journal diameter or a missing dog bone thrust plate on far side of cam. ((Dr Dick of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/128889-points-cover-seal-leak/page2?t=1341815&page=2)) \\ Also look for a blocked drain hole (putting the seal in too far can do this). The seal goes flush to outer surface. \\ A new bushing too long hitting the seal lip when the seal was installed would do it also. \\ Same as the seal bore not concentric to the cam bushing (holds seal off center). \\ __Look for OD leaks__; the seal bore nicked, tearing the seal OD when installing it. |
| * **Seal removal / installation**. |
* The seal can be a bit tedious to remove. ((IronMick of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/179404-oil-in-point-cavity?t=1927721&highlight=shift+leak)) The seal itself will get wrecked as you remove it. \\ Just need to be careful to not scratch the sealing surface as you work. |
* You force it out with a pointed tool, an oil seal remover tool or a flat blade screwdriver. ((IronMick of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/52709-main-cam-seal-leak-help?t=237296)) |
| * Look for scratches, gouges or wear marks on the cam shaft where the seal seats. If there are any, they need to be removed or the shaft changed. \\ Also check if there are any gouges or cracks around the outside diameter of where the seal fits in (bore). \\ These can be put there during seal removal and let oil seep out around the outside of the seal. They can usually be scraped or filed back flat. \\ You can make a scraper by grinding the teeth off the end of a three-sided file. |
* Lightly grease the lip that surrounds the cam. However, the seal OD should be installed rather dry or with an appropriate sealer (not RTV). \\ A thin layer of non hardening aviation gasket sealer etc. around the seal OD lubricates the installation. ((Hopper of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/52709-main-cam-seal-leak-help?t=237296)) \\ (and helps stop leaks around imperfections in roundness) \\ |
| * Then you can tap a new one in with either an oil seal installation tool or a socket of appropriate diameter. |
* If you decide to pull the cover to change the seal (better idea), remove the push rods FIRST. ((8ball of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/179404-oil-in-point-cavity?t=1927721&highlight=shift+leak)) |
|
| Pulling oil seal gently with small bicycle tire iron. ((photo by Hopper of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/50355-and-yet-another-77-ground-up-rebuild/page11?t=209347&page=11)) | |
| |{{:techtalk:ih:oil:removing_cam_seal_in_cover_by_hopper.jpg?direct&300|}}| |
|
| ===== Breather Vent / Tube ===== |
|
| Oil leaking out the breather vent (or oil carry-over) can happen for many reasons. \\ |
| First, the air leaving the engine can carry oil mist with it which is normal. There will be a drop or two but not a lot to be concerned with. \\ |
|
|
| * **Oil slinger issues**: |
* A warped or bent oil slinger washer would fling oil into the vent. ((randy3934 of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/153442-breather-spitting-too-much-oil/page3?t=1651226&highlight=slinger&page=3)) |
| * Over-tightening the washer locknut can warp the washer and caused it to drag against the bushing in the cover. \\ This wouldn't classify as a crankcase pressure problem but rather a mechanical problem that can be fixed. |
* If the oil slinger on the generator gear is loose and spinning or missing on the shaft, oil may gather in the gearcase and puke. ((MDT of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.php?p=746961sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/33613-74-xlch-oil-blowing-out-of-breather#post719364)) |
| * In theory, it spins really fast with the generator shaft and slings oil away from the breather tube so that only vapor is going out the tube. \\ It would be a simple check to pull off your generator and make sure the slinger washer is tight to the generator shaft. |
* Sometimes people remove the oil slinger washer from the generator or never install one if they went to an alternator. ((72 Ironhead XLH of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/50376-cam-cover-breather-vent-tube-question?t=209369)) \\ This cause`s a bit more mist to exit the tube. \\ However, there is no good reason to leave the flat oil slinger washer off when fitting an alternator. ((Hopper of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/136499-crankcase-breather-system?t=1481155)) \\ It is an ESSENTIAL part of the breather system and doesn't affect the operation of the alternator at all. \\ The inner bearing deflector maybe, but not the oil slinger on the end of the shaft. \\ Trick to removing the generator: Lift up on the inner end and hold down on the outer end, and remove it. \\ {{:techtalk:ih:oil:bent_oil_slinger_washer_by_rochesteriron.jpg?direct&300|}} ((photos by RochesterIron of the XLFORUM, edited by Hippysmack httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/154517-glittery-oil-continued-pulled-cam-cover-today?threadid=1659747)) |
| * **Breather valve issues**: \\ [[techtalk:ih:engmech07|Click here]] to see the different configurations of breather valves per year model. |
| * **On 57-76 engines**, the engine breather is a rotary breather valve on top of the oil pump. It has to be timed to open and close correctly. \\ If it is timed incorrectly, it can pump too much air out the breather vent, carrying oil mist with it. \\ You're timing the engine crankcase breather tower on top of the oil pump. It has to open on downstroke and close on upstroke. |
|
| * Due to their construction, either needs to be periodically maintained for proper operation. \\ You can't just ignore these breather valves and never have a problem with them. |
| * **Oil screen in the gearcase (57-76)**: |
* Inside the timing chest there is a brass screen on the inlet to the return side of your oil pump. ((BuckIRyder of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.php?p=746961sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/33613-74-xlch-oil-blowing-out-of-breather#post719364)) \\ If this screen gets blocked (by say, pieces of cam shims), the timing chest will fill with oil which will puke out the breather tube. \\ Only way to check is pull the cam cover and inspect the screen. |
| * **Scavenge side of the oil pump not working / not working properly**. |
* This leads to too much oil building up in the crankcase. (air leak in oil pump connections, worn gears, sheared shear pin, clogged inlet) ((Hopper of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/50376-cam-cover-breather-vent-tube-question?t=209369)) |
| * **Check for a pinched breather hose or a stopped up tube that could cause high crankcase pressure**. \\ If you've zip tied the hose to the frame or added a filter on the end of the breather hose, pressure will be affected. |
| * **Check the breather hose routing**. \\ The hose should run verticle from the cover to the A/C or out and down maybe toward the chain as some do. \\ There should not be a bend in the line routing to allow oil to collect in the hose, accumulate and blow out in gulps. |
| * **Crankcase pressure problems can cause oil weeping or leaking from the breather tube**. \\ See [[techtalk:ih:oil06#crankcase_pressure_problems|Crankcase Pressure Problems]] below. |
| * **79-85 cam covers can be modded to accept a secondary breather vent hose**. |
* 79-up Ironheads can benefit from removing the 6 o'clock plug from the cover and adding an additional breather hose there. \\ It allows the crankcase pressure to evacuate faster, which results in the motor being a little more free-revving. \\ A side benefit is that it will largely eliminate the "oil in the air cleaner" syndrome, assuming the original breather is left in place. \\ You can terminate the extra breather hose under the engine. However, it will drip a spot or two of oil there when parked. \\ [[techtalk:ref:engmech05|Click here]] to see more about this mod. \\ {{techtalk:ref:engmech:secondary_breather_vent_by_83xlx.jpeg?direct&300|}} ((photo by 83XLX of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/128453-crankcase-breathing-cycle/page3?t=1332902&page=3)) |
|
| ===== Primary / Transmission Vent ===== |
|
| * **Check the tranny vent hose for kinks or a blockage**. |
| * Blow on the hose end to make sure you can push air thru it. Do not used compressed air as that can damage the sprocket shaft seal. \\ |
* The hose can be blocked from gunked up oil/dirt and in some cases has been known to be blocked by creatures (think Wasps and Dirt Dobbers). ((Gone of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-drivetrain/sportster-motorcycle-transmission-clutch-primary-secondary-drive/95798-transmission-vent?t=801718)) |
| * **Transmission Vent Hose Routing**: |
| * On late 1981 XLH/XLS models, the transmission vent hose routing was changed to reduce excessive oil leakage from the transmission. ((HD TSB #M-813 dated January 30, 1981)) \\ [[techtalk:miscres:miscres05|Click here]] to go to the TSB page in the Sportsterpedia and download the full TSB PDF. \\ Early 1981 models can be changed to the new routing. The transmission vent hose should be routed; |
|
| * Reroute the hose if it is showing a kink in placement or replace it if you can't blow through it. \\ There should be no sags in the hose between the attachment to the engine and the open end of the hose. \\ There is also a Service Bulletin, M-1143, discussing proper vent hose routing with illustrations for rigid Evos. \\ [[techtalk:miscres:miscres05|Click here]] to go to the TSB page in the Sportsterpedia and download the full TSB PDF. |
|
| Primary / chain inspection plug vent hole on 76 XLH | 1977-up transmission / primary vent location. ((photo by Hopper of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/50355-and-yet-another-77-ground-up-rebuild/page11?t=209347&page=11)) | |
| |{{:techtalk:ih:oil:chain_inspection_plug_on_76_xlh.jpg?direct&400|}}|{{:techtalk:ih:oil:1977_transmission-primary_vent_by_hopper.jpg?direct&300|}}| |
===== Timing Inspection Plug / Drain Plugs ===== |
|
| ===== Timing Inspection Plug / Drain Plugs ===== |
| * **These have been common areas for an oil leaks**. |
| * Over-torque during installation and heat / expansion during use seems to be the primary cause of distorting the threads. |
|
| * [[techtalk:ref:engmech01d|Drain Plug Sealing and Temporary Fixes]] |
|
| On 57-76 engines, look for a crack at the primary drain plug. ((photo by Shadowdog500 of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/96156-drilling-and-tapping-sump-plug-in-place-73xlch/page2?t=806833&highlight=drilling+tapping+drain&page=2)) ((photo by ss396 of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/173827-crankcase-drain-plug?t=1864035&highlight=Ironhead+Crankcase+Drain+Plug)) || |
| |{{techtalk:ih:oil:ih_drain_plugs_by_shadowdog500.jpg?direct&300|}}|{{techtalk:ih:oil:ih_oil_drain_plug_2_by_ss396.jpg?direct&300|}}| |
|
| ===== Clutch Cable or Connection to the Primary Cover ===== |
| \\ |
| ===== Leaking with Engine Running (weeping gaskets) ===== |
| See also [[techtalk:ref:oil10|Wet Sumping]] in the Sportsterpedia. \\ |
|
| * Running the bike hard shouldn't be an issue. \\ However, running the bike hard compounds the problem if there are any issues listed above. \\ High RPM makes these issues worse. |
| * **Using powder to detect a leak**: |
* Degrease the bike until there's no oil remaining. \\ Then take some Soft n Dri (women's antiperspirant spray), talcum powder etc. and spray it around the rocker gaskets (or other suspected leaking area). ((ReddTigger of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/161350-rocker-covers-leaking-argh?t=1732579&highlight=rocker+box+inserts)) \\ It will go on clear but when it gets heated will turn to a white powder. Just a light film is all it takes. \\ Whenever it starts leaking it'll show up exactly where the leak is. \\ |
* Clean the engine, then start it and use a bright light to see where the leak is coming from. ((Bob F of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.php?p=5774586sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/197800-oil-leak#post4335162)) \\ The light should make the liquid oil shine. You may only have to run your scoot for a few seconds to start leak. |
|
|Rocker boxes sprayed with powder antiperspirant to detected oil leaks. ((photos by CitySlicker of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/161350-rocker-covers-leaking-argh/page2?t=1732579&highlight=rocker+box+inserts&page=2))|| |
| |{{:techtalk:evo:oil:diagnosing_oil_leak_1_by_cityslicker.jpg?direct&300|}}|{{:techtalk:evo:oil:diagnosing_oil_leak_2_by_cityslicker.jpg?direct&300|}}| |
|
| ===== Leaking with Engine Shut Off ===== |
|
| Sit Sumping. See more about [[techtalk:ref:oil10#sit_sumpimg|Sit Sumping]] in the Sportsterpedia. \\ |
|
* Clean the area thoroughly (like with rake cleaner and air blow dry). ((Ferrous Head of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.php?p=5774586sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/197800-oil-leak#post4335162)) \\ Let it sit long enough to begin leaking and blow some talcum powder over the area. \\ The talc will stick to the oil and pinpoint the origin. \\ |
* Take an old bike tube and cut a piece while retaining the valve stem. ((ezmerf of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.php?p=5774586sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/197800-oil-leak#post4335162)) \\ Use a hose clamp to tighten it over the filler neck on the oil tank. \\ Then put a lb are two of air pressure on it and see if that helps you locate where it's coming from. |
|
| ===== Leaking From the Primary Chain Inspection Cover ===== |
| \\ |
| ===== Leaking From Primary Tensioner Bolt ===== |
|
The chain adjuster is the lowest point so leaks from anywhere often end up there. ((IronMick of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/179037-84-primary-oil-leak-from-chain-tensioner-bolt?s=4c72b9196b3bbb5eba4dd0f61f777757&t=1923876)) \\ |
| There is a good chance the actual leak is elsewhere. Clean up the area, tape a paper towel over the adjuster stud, ride or let sit overnight and see what you get. \\ |
|
If it indeed is leaking from the stud / nut, you can try some Permatex Form-A-Gasket #2 on the threads and a skinny nut with a copper washer. ((78ironhead of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/179037-84-primary-oil-leak-from-chain-tensioner-bolt?s=4c72b9196b3bbb5eba4dd0f61f777757&t=1923876)) \\ |
| (not just a flat washer, one like a spark plug washer that will conform to uneven surfaces) \\ |
| If that doesn't work, start looking for a crack in the case near the hole. If the nut has been over tightened, the primary cover may be damaged. \\ |
| A copper washer and a new nylock to seal the threads is usually all that is required unless you have further issues. |
|
{{:techtalk:ih:oil:leaky_primary_chain_tensioner_bolt_by_akeemking.jpg?direct&300|}} ((photo by Akeemking of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/179037-84-primary-oil-leak-from-chain-tensioner-bolt?s=4c72b9196b3bbb5eba4dd0f61f777757&t=1923876)) \\ |
|
| ===== Leaking from the Sprocket Cover ===== |
|
'77-up models have a bolt hole drilled all the way into the tranny cavity from the bottom attaching hole in the sprocket cover. ((ericfreeman of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/123207-79-xlh-oil-leak-help?s=4c72b9196b3bbb5eba4dd0f61f777757&t=1220467)) \\ |
| It doesn't leak if the bolt is removed while on the side stand if you have the correct amount of lube in there. \\ |
| If you develop a leak there, you can use some thread sealant on the bolt to ensure no leaks once tightened. \\ |
|
{{:techtalk:ih:oil:sprocket_cover_thru_hole_1_by_ericfreeman.jpg?direct&300|}} ((photo by ericfreeman of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/123207-79-xlh-oil-leak-help?s=4c72b9196b3bbb5eba4dd0f61f777757&t=1220467)) {{:techtalk:ih:oil:sprocket_cover_thru_hole_2_by_ericfreeman.jpg?direct&300|}} ((photo by ericfreeman of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/123207-79-xlh-oil-leak-help?s=4c72b9196b3bbb5eba4dd0f61f777757&t=1220467)) {{:techtalk:ih:oil:sprocket_cover_thru_hole_1_by_hopper.jpg?direct&300|}} ((photo by Hopper of the XLFORUM, labeled by Hippysmack httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/50355-and-yet-another-77-ground-up-rebuild/page10?t=209347&page=10)) \\ |
|
| ===== Final Drive Sprocket ===== |
|
* **The gasket at the mainshaft behind the sprocket cover is a common leak area**. ((brucstoudt of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/194286-%6083-xlx-rebuid-and-questions-thread/page36?t=2070501&page=36)) |
| * The main ones available are a thin red material and easily torn when installing. |
| * It could be the main shaft seal or counter shaft bearing that's leaking also. |
| * Too much torque on the retainer bolts can split the gasket. |
* Inside the case there is a trough along the roof of the trans compartment that catches oil to drip thru the arbitrary hole behind the seal. ((mrmom9r of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/136182-moderate-leak-behind-drive-sprocket-from-unknown-hole-83-xlx/page2?t=1477118&page=2)) \\ It's an oiler hole to let oil gravity feed to oil outer half of bearing. |
* Check that the surface where the seal runs on your drive sprocket isn't rough. ((russzx6 of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/136182-moderate-leak-behind-drive-sprocket-from-unknown-hole-83-xlx/page2?t=1477118&page=2)) They can be rough from new and will chew a seal up in no time. \\ Also put a little sealant on the splines when you put the sprocket on. |
| * **Welch plug**. |
* The welch plug for the shift fork shaft hole can leak. ((mrmom9r of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/136182-moderate-leak-behind-drive-sprocket-from-unknown-hole-83-xlx/page2?t=1477118&page=2)) |
| * This hole supports the outer end of the shaft that the shift forks ride on and a small plug is pressed in the hole on the outside of the case. \\ Very common leak, sometimes the plug is knocked out by accident during trans. assembly. Sometimes they just weep on their own. \\ It's located at about 4 o'clock from the mainshaft yet still hidden behind the sprocket. You can use JB Weld if the plug is still present - replace the plug if it's not present. |
|
| Oiler hole behind seal is blocked off by the seal. ((photo by Ironhead_Ed of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/136182-moderate-leak-behind-drive-sprocket-from-unknown-hole-83-xlx?t=1477118)) | |
| |{{:techtalk:ih:oil:oiler_hole_behind_sprocket_seal_by_ironhead_ed.jpg?direct&300|}}| |
|
| Mainshaft sprocket gasket leak. ((photo by Roane of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/200009-oil-leak?t=2076964)) | Gasket split from tightening too much. ((photo by IronMick of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/194286-%6083-xlx-rebuid-and-questions-thread/page37?t=2070501&page=37)) | |
| |{{:techtalk:ih:oil:mainshaft_sprocket_gasket_leak_by_roane.jpg?direct&300|}}|{{:techtalk:ih:oil:split_sprocket_gasket_by_ironmick.jpg?direct&300|}}| |
|
|
| ====== Diagnosing the Cause of Oil Leaks ====== |
|
| Do the detective work before you do the wrenching. ((Dr Dick of the XLFORUM)) \\ |
|
Obviously you must find exactly what is leaking before you can determine what will be needed to fix it. ((santis5 of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/frame-mount-evo-sportster-talk-1986-2003-models/82747-oil-leaks?t=615245)) \\ |
| Degrease the area in question and run the bike a little and watch the area for the beginning signs of seepage. \\ |
| Check torque on the bolts on covers and parts with gasket/seals but do not tighten more than the specs in the FSM to stop a leak. \\ |
|
| In some cases, a considerable amount of the engine has to be disassembled just to get to the problem. Refer to your FSM for the proper procedures. \\ |
| Always keep a close watch on oil levels if you know you have a leak. \\ |
|
|
| ===== Crankcase Pressure Problems ===== |
|
| See also in the Sportsterpedia: \\ |
| * [[techtalk:ref:oil04#crankcase_pressure_venting_in_the_oil_tank|Crankcase Pressure / Venting in the Oil Tank]] \\ |
|
| * You can buy or make your own manometer (slack tube, U-tube) for testing. \\ Once you have the apparatus, bolt it to wall where you normally do maintenance. \\ It only takes a few minutes to hook it up and get a reading and it helps to spot trouble before trouble happens. \\ See [[techtalk:ref:genmsr04|Using / Diagnosing with a Slack Tube (Manometer)]] for testing crankcase pressure. |
|
| L82-90 cap, tube and umbrella ((photo by norseXL of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/36799-installing-the-ultimate-crankcase-vent-%C2%93how-to%C2%94/page25?t=72099&page=25)) | Breather baffle tube installed ((photo by Bryan350 of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/frame-mount-evo-sportster-talk-1986-2003-models/159628-cam-cover-question?t=1712011)) | |
| |{{:techtalk:evo:oil:86_crankcase_vent_3_by_norsexl.jpg?direct&300|}}|{{:techtalk:evo:oil:89_cam_cover_3_by_bryan350.jpg?direct&200|}}| |
|
|Homemade manometer using a ruler as a scale. ((photo by Hippysmack of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.php?p=5784790sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-bottom-end/197307-sportster-crankcase-pressure-engine-breathing-wetsumping-and-mods/page52#post5784790post4349847))| Compression test. ((photo by MatHormell of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/183888-hammerperf-90-in-the-works/page71?t=1976997&page=71)) | |
| |{{:techtalk:ref:engmech:homemade_slack_tube_5_by_hippysmack.jpg?direct&300|}}|{{techtalk:ref:svcproc:checking_compression_1_by_mathormell.jpg?direct&150|}}| |
|
|
| ===== Inspecting the Oil Tank ===== |
|
| \\ |
| ==== Overfilled Oil Tank ==== |
|
| [[techtalk:ref:oil01#overfilling_the_oil_tank|Read more on Overfilling the Oil Tank here]] in the REF section of the Sportsterpedia. \\ |
|
|
|
| ==== Damaged or Flooded Oil Tank Vent / Return Tube ==== |
|
| Vehicles with oil tanks, that have all the fittings on the bottom of the tank, use a stand tube inside the tank for the vent line. ((HD Tech Tips dated November 8, 1985)) \\ |
| * Short, damaged or tilted stand tubes: |
|
|
| ==== Loosing Oil Level in the Tank ==== |
| \\ |
| === (57-85) === |
|
|
|
| === (57-76) === |
|
| Oil can seep into the crankcase and spill into the primary compartment thru the transfer valve. \\ |
| See [[techtalk:ih:oil06#check_the_oil_transfer_valve_57-76|Check the oil transfer valve below]]. \\ |
|
| ===== Inspecting the Engine Oil Return System ===== |
| \\ |
| ==== Restricted Oil Return Hose ==== |
|
| * Oil carry over will occur while driving the vehicle at highway speeds. The amount of carry over is directly related to the amount of restriction. ((HD Tech Tips dated November 8, 1985)) |
| * More restriction, more carryover. In most cases the restriction is minor and translates to a small amount of carry over, which if left alone creates a bothersome mess. |
|
|
| ==== Restricted Tappet Guide Drain Channel ==== |
|
| Oil from the rocker boxes drains down the pushrod tubes and enters holes in the tappet block to drain down into the gearcase. \\ |
| The drain channels can stop up sometimes. This backs up oil in the tubes and can cause a leak to form at the tube base. \\ |
It could be the gasket or sometimes particles that have lodged in the holes. Try removing the tappet guide, clean / replace them and install new gaskets. ((ironheadjunkie of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/130686-excessive-oil-accumulating-in-pushrod-tube-74-xlh?t=1379395)) \\ |
| Some guides have one channel, some two, and there are some that have a spiral. \\ |
| Over the course of the motors lifetime, there's no telling what year or type of guides they may be since one fits all. \\ |
| But you do need to get it right, since the oil return thru the guide also lubricates the tappets. \\ |
|
To remove them, some will tap the guides gently to rotate them a little to break the hold then just pull them out by hand. ((Hopper of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/130686-excessive-oil-accumulating-in-pushrod-tube-74-xlh?t=1379395)) \\ |
| It will then need a new seal or gasket under the tappet block. |
|
Fairly common with some jugs is the tappet guide hanging up on the cylinder fins when trying to remove it. ((ironheadjunkie of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/130686-excessive-oil-accumulating-in-pushrod-tube-74-xlh?t=1379395)) \\ |
| You may need to clearance the base of the jug before you remove the tappet. \\ |
Alternately, if you can lift the guide high enough, you may be able to clean the drain channel with the tappet guide still in place. ((The Doctor71 of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/130686-excessive-oil-accumulating-in-pushrod-tube-74-xlh?t=1379395)) \\ |
| Try and use compressed air to blow down the drain channel. \\ |
|
| The pushrod tube below was holding oil and leaking after the engine was shut off. \\ |
{{:techtalk:ih:oil:pushrod_tube_oil_leak_by_the_doctor71.jpg?direct&250|}} ((photo by The Doctor71 of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/130686-excessive-oil-accumulating-in-pushrod-tube-74-xlh?t=1379395)) \\ |
|
|
| ===== Leaking From / Near Primary ===== |
|
| **57-76**: \\ |
| Check the primary oil level to see if it's too high. Sumped oil from the engine can spill over into the primary compartment thru the transfer valve. \\ |
|
| With the primary cover off, you may see this happening as oil spills in from the (now oil laden) crankcase. \\ |
| If pressure is building and blowing out the gasket or the transfer valve isn't sending the oil back, see [[techtalk:ih:oil06#check_the_oil_transfer_valve_57-76|Check the oil transfer valve below]]. \\ |
|
|
| ==== Transmission Vent Hose (77-85) ==== |
|
| Check the tranny vent hose for kinks or a blockage. \\ |
| Blow on the hose end to make sure you can push air thru it. Do not used compressed air as that can damage the sprocket shaft seal. \\ |
| Reroute the hose if it is showing a kink in placement or replace it if you can't blow through it. \\ |
| You can also take off the primary chain inspection cap and blow air into the primary compartment. \\ |
You should hear and feel the air come out of the inspection hole and with the cap off, you are not pressurizing anything too much. ((IronMick of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/105711-84-leaking-bad-from-tranny-vent/page2?t=944018&page=2)) \\ |
| There should be no sags in the hose between the attachment to the engine and the open end of the hose. \\ |
| The hose should route up from the engine and loop down open ended to allow air to escape and oil to separate from the air and drop back down into the tranny compartment. \\ |
|
| If you've verified the hose is in good order and oil is still coming out the vent hose, then the engine sprocket seal is suspect of leaking engine oil into the primary. \\ |
| See Engine Sprocket Shaft Seal below. \\ |
|
| ==== Engine Front Sprocket Shaft Seal ==== |
|
| \\ |
| ==== Test for Excess Primary Compartment Vacuum (77-85) ==== |
|
| You can test for too much vacuum in the primary with the engine running / transmission in neutral. ((HD Tech Tip #36 dated October 1993)) \\ |
| You can make your own slack pretty cheap out of some 2x4 pieces, a 2-3 ft ruler and a clear tube. \\ |
|
|
| ==== Leaking From Around the Starter ==== |
|
There should be a paper (or cork) gasket between the OEM starter motor and the case. ((IronMick of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/102268-oil-leaking-from-electric-starter-help?t=891706) \\ |
If the oil level is too high in the primary, especially if using an aftermarket starter, many of them like Tech Starters and Spyke have poor shaft seals. ((Jorgen of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/102268-oil-leaking-from-electric-starter-help?t=891706)) \\ |
| They often leak from day 1 on a Sportster. When the seal is leaking, oil starts dripping from the drain hole under the starter. \\ |
|
| ==== Primary Oil Smell Like Gas? ==== |
|
| Where did the gas smell come from? \\ |
| See also [[techtalk:ref:oil01#why_does_the_oil_smell_like_gas|Why Does the Oil Smell Like Gas]] in the Sportsterpedia. \\ |
|
|
| ====== Internal Inspection ====== |
|
| \\ |
| ===== Check the spark plugs for oil fouling ===== |
| Worn rings or an imbalance in crankcase pressure can send oil up into the combustion chamber and foul the plugs. \\ |
| Check the plugs for wet oil saturation. \\ |
|
|
{{:techtalk:evo:oil:hunting_for_oil_leaks_7_by_cjburr.jpg?direct&300|}} ((photo by cjburr of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpvendors/nrhs-high-performance/32415-oil-usage-and-timing/page14?t=53769&highlight=valve+guide&page=14)) {{:techtalk:evo:oil:hunting_for_oil_leaks_8_by_cjburr.jpg?direct&300|}} ((photo by cjburr of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpvendors/nrhs-high-performance/32415-oil-usage-and-timing/page14?t=53769&highlight=valve+guide&page=14)) \\ |
|
| ===== Check the oil transfer valve (57-76) ===== |
|
| Or, many have weld the transfer valve shut so oil from the crankcase can't get into the primary to begin with. |
|
| Leaky transfer valve. ((photo by CanadianTux of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/154825-1971-xlch-wont-accelerate-help/page6?t=1661718&page=6)) | |
| |{{:techtalk:ih:oil:leaky_transfer_valve_pic1_by_canadiantux.jpg?direct&300|}}| |
|
| ===== Engine Sprocket Seal ===== |
|
| Leak from bad sprocket seal. ((photos by Captain Johnny of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.php?p=5847905sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/200677-engine-output-shaft-oil-seal#post5847905post4434741)) || |
| |{{:techtalk:ih:oil:engine_sprocket_seal_pic1_by_captain_johnny.jpg?direct&300|}}|{{:techtalk:ih:oil:engine_sprocket_seal_pic2_by_captain_johnny.jpg?direct&300|}}| |
|
| ===== Inner Primary - Chain Tensioner Bolts ===== |
|
| * The bolt holes for the chain tensioner go through to the crankcase. |
| * If the crankcase fills with oil (wetsumps), oil can weep around bolt threads and into the primary compartment. \\ Especially if the bolt is loose or if the threads have been worn bigger. |
|
{{:techtalk:ih:oil:chain_tensioner_threaded_hole_by_captain_awesome.jpg?direct&300|}} ((photo by captain awesome of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/166530-countershaft-bearing-hack-fix-need-opinions/page4?t=1789169&page=4)) \\ |
| ===== Check intake and exhaust ports in the heads ===== |
|
| * You can pull your exhaust pipes and intake manifold and look at the valves to see if the oil is leaking past the valve stem seals. |
|
| ===== Check oil smudge marks when removing the heads ===== |
|
When dismantling the top end (or to bring parts to your mechanic)and before cleaning the head gaskets / surfaces, check them for oil smears. ((IronMick of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/180459-oil-leak-on-my-77-sportster/page2?t=1940586&page=2)) \\ |
| Smudge marks can be a give away as to where any leaks might occur. Also take a few pics of them (no flash, direct light and a steady hand). \\ |
| The gasket has been known to raise around the head oil drain and only on the inside edge of the gasket. \\ |
|
|
| ===== Transmission Sprocket Splines ===== |
|
| A service replacement mainshaft sprocket nut (35049-71) was made available to prevent transmission oil leakage from the sprocket splines on 1971-E1984 models. \\ |
| The new sprocket nut encloses the end of the mainshaft and provides a metal to metal seal between the sprocket, lockwasher and nut. \\ |
|
|
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| \\ |
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\\ |
| [[:techtalk:menu|{{:techtalk:gototechnicalmenu.jpg|}}]] |
