IH: Oiling & Lubrication - Sub-03A

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.
[[:techtalk:menu|{{  :techtalk:gototechnicalmenu.jpg|}}]]
====== IH: Oiling & Lubrication - Sub-03A ======
====== 77-85 Oil Pump ======
See also [[techtalk:ih:oil03b|77-85 Oil Pump and Parts (app.) Dims]]
\\

|{{:techtalk:ih:oil:83_xlx_oil_pump_by_gc5444.jpg?direct&300|}}|
|  Oil Pump on 83 XLX ((photo by GC5444 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1704016))  |

====== Individual Parts and Pics ======
====== Oil Pump Body and Cover ======

**E77**: \\
Special "1600" oil pump stamped with an "O": \\
(26484-75) Oil pump body \\
(26486-75) Pump cover \\

**Late 77-81**: \\
(26484-75) Oil pump body \\
(26486-75) Pump cover \\

**82-E83**: \\
(26484-83) Oil pump body \\
(26486-83) Pump cover \\

**L83-85**: \\
(26484-75A) Oil pump body \\
(26486-75A) Pump cover \\

===== Oil Pump Body =====

|{{:techtalk:ih:oil:77-85_oil_pump_body_9_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_body_10_by_hippysmack.jpg?direct&300|}}|

|{{:techtalk:ih:oil:77-85_oil_pump_body_11_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_body_8_by_hippysmack.jpg?direct&300|}}|

|{{:techtalk:ih:oil:77-85_oil_pump_body_5_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_body_6_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_body_7_by_hippysmack.jpg?direct&300|}}|

===== Oil Pump Cover =====
|{{:techtalk:ih:oil:77-85_oil_pump_cover_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_cover_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_cover_3_by_hippysmack.jpg?direct&300|}}|

|{{:techtalk:ih:oil:77-85_oil_pump_cover_4_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_cover_5_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_cover_6_by_hippysmack.jpg?direct&300|}}|
====== Gearshaft ======
See also [[techtalk:ih:oil03b#gear_shaft_dims|Gear Shaft Dims]]. \\
The gear shaft (26488-75) was used from 77-90. \\

The gear dims and teeth pitch are all the same nominally from 77 to present oil pumps. \\
However, there are variations of the exact length of the shaft. \\

|{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_2.0_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_comparison_1_by_dirtycory.jpg?direct&300|}}|
|  All have 20 teeth gears ((photo by Hippysmack))  |Longer shaft (L), Shorter shaft (R) with hash marks \\ on the top. Reason for the hash marks presently \\ unknown. ((photo by DirtyCory of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071153&page=8))|

|{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_comparison_2_by_dirtycory.jpg?direct&300|}}|
|  This shows where the wear occurs. ((photo by Hippysmack))  |  Lengths slightly different. ((photo by DirtyCory of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071153&page=8))  |

====== Gear Shaft Retaining Ring ======

|{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_retaining_ring_by_hippysmack.jpg?direct&300|}}|
====== Gearshaft Pins ======
See also [[techtalk:ih:oil03b#section2648875|Gearshaft Pin Dims]] \\

(26430-76) Gear shaft pin. \\
These are solid pins (not to be confused with a roll pin with a hollow core) ((brucstoudt of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071153&page=5))


|{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_pins_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_pins_3_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_gearshaft_pin_location_5_by_hippysmack.jpg?direct&300|}}|
====== Separator Plates ======
===== Inner Plate =====
See also; \\
[[techtalk:ih:oil03b#inner_plate|Inner Plate Dims]] \\

The inner plate (26463-77) is the top plate (with the pump installed). \\
The return gerotors sit on this plate. \\
It was used in all 77-90 oil pumps. \\

|{{:techtalk:ih:oil:77-85_oil_pump_inner_separator_plate_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_inner_separator_plate_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_inner_separator_plate_3_by_hippysmack.jpg?direct&300|}}|
|  Inner plate (26463-77). Hole for the gearshaft is off center. Machined step is to locate the spring washer between the two plates. ((photos by Hippysmack))  |||  

|{{:techtalk:ih:oil:77-85_inner_plate_installed_position_by_hippysmack.jpg?direct&300|}}|
|Inner separator plate installed position. \\ (pump upside down) ((photo by Hippysmack))|
===== Outer Plate =====
See also; \\
[[techtalk:ih:oil03b#outer_plate|Outer Plate Dims]] \\

The outer plate is the bottom plate (with the pump installed). 
The feed gerotors sit under this plate. \\

  * (26493-75) was used in 77-82 oil pumps.
  * (26493-75A) was an upgrade for the E83 pump assembly. \\ It also was used in the re-designed L83-85 assemblies as well as all 86-90 oil pumps.

Either will fit 77-90 oil pumps with their respective seals. \\

|{{:techtalk:ih:oil:outer_plates_-_as_annotated_-_by_dirtycory.jpg?direct&500|}}|
|  Outer plate comparison ((photo by DirtyCory of the XLFORUM, annotated by Hippysmack http://xlforum.net/forums/showthread.php?t=2071153))  |

77-82 outer plate (26493-75) I.D. 0.518" \\

|{{:techtalk:ih:oil:77-82_oil_pump_outer_separator_plate_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-82_oil_pump_outer_separator_plate_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_outer_separator_plate_4_by_hippysmack.jpg?direct&300|}}|
|  77-82 oil pump outer separator plate top view  ((photo by Hippysmack))  |  77-82 oil pump outer separator plate bottom view  ((photo by Hippysmack))  ||

83-90 outer plate (26493-75A) I.D. 0.683" \\

====== Outer Separator Plate Seal ======
**Seal 1** \\
|{{:techtalk:ih:oil:77-85_oil_pump_outer_plate_seal_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_outer_plate_seal_2_by_hippysmack.jpg?direct&300|}}|

**Seal 2** \\
|{{:techtalk:ih:oil:12036a_outer_plate_seal._by_dirtycory.jpg?direct&600|}}|

====== Spring Washer ======

|{{:techtalk:ih:oil:77-85_oil_pump_spring_washer_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_spring_washer_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_spring_washer_3_by_hippysmack.jpg?direct&300|}}|

|{{:techtalk:ih:oil:77-85_oil_pump_spring_washer_4_by_hippysmack.jpg?direct&300|}}|


====== Gerotors ======
See also; \\
[[techtalk:ih:oil03b#gerotor_dims|Gerotor Dims]] \\
 
    * There were 2 different sets of gerotors used in Sportster oil pumps from 77-85.
      * 77-E83; Return set (26491-75), Feed set (26492-75). \\ Discontinued for production models by November of 1982. ((HD Service Bulletin #M860 dated November 12, 1982 pg 2)) \\ Sold for 77-E83 oil pumps through 1984.
      * L83-85; Return set (26491-83), Feed set (26492-83).
    * The -78B parts book lists the original gerotors. \\ (even though that catalog was written in 1989 after the design change).

The outside gear in each 77-E83 gerotor set was chamfered. \\
The outside gear in each L83-85 gerotor set was straight cut. \\
|{{:techtalk:ih:oil:77-e83_outside_gerotor_edge_by_dirtycory.jpg?direct&200|}}|{{:techtalk:ih:oil:l83-85_outside_gerotor_edge_by_dirtycory.jpg?direct&200|}}|
|  77-E83 gerotor outside edge ((photo by DirtyCory of the XLFORUM  http://xlforum.net/forums/showthread.php?t=2071153&page=3))  |  L83-85 gerotor outside edge ((photo by DirtyCory of the XLFORUM  http://xlforum.net/forums/showthread.php?t=2071153&page=3))  |

===== Late 1983 oil pump assembly design modification =====
 
  * The late 83 oil pump assembly (26197-83) gerotor gears are fabricated without the chamfered top and bottom on the outer diameters as was in the 77-E1983 gerotors. \\ This new assembly will retrofit to 77-E83 engines ((HD Service Bulletin #M860 dated November 12, 1982 pg 2)) ((HD Service Bulletin #M-892 dated June 22, 1984)) \\ The new gerotors will retrofit to the 82 model pump body and cover. ((79-85 HD XL models Parts Catalog -85A pg 21))
  * Late 1983 pump bodies and covers were also under-cut or relieved to accommodate for clearances with the new gerotors. 
  * The 77-E83 chamfered gerotors have a (.020" x 45° chamfer or .020") radius and the same radius is designed into their respective oil pump body / cover. 
  * The Late 83 pump body and cover has a (.010" max. radius) undercut for clearance designed into them.
  * These modifications limit interchangeability and affect the installation of repair parts:
    * Either early style or late style gerotor gears may be used with late style (under-cut) oil pump bodies and covers.
    * Only early style chamfered gerotor gears may be used with early style oil pump bodies and covers \\ (Use of  late style gerotor gears in early style oil pump bodies and covers could cause the oil pump to bind up and possible pump failure).

===== Feed Gears =====
===== 77-E83 =====
(26492-75)
These can also be used on L83-85 oil pumps. ((HD Service Bulletin #M860 dated November 12, 1982 pg 2)) \\
|{{:techtalk:ih:oil:77-85_oil_pump_feed_gerotors_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_feed_gerotors_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_feed_gerotors_5_by_hippysmack.jpg?direct&300|}}|

===== L83-85 =====
(26492-83) Straight cut feed gerotors. 

===== Return (scavenge) Gears =====
===== 77-E83 =====
(26491-75) Chamfered return gerotors
These gerotors can also be used in L83-85 oil pumps. ((HD Service Bulletin #M860 dated November 12, 1982 pg 2)) \\
|{{:techtalk:ih:oil:77-e83_oil_pump_gerotors_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-e83_oil_pump_gerotors_2_by_hippysmack.jpg?direct&300|}}|

|{{:techtalk:ih:oil:77-85_oil_pump_scavenger_gerotors_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_scavenger_gerotors_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_scavenger_gerotors_3_by_hippysmack.jpg?direct&300|}}|

===== L83-85 =====
(26491-83) Straight cut return gerotors. 
====== Check Valve ======
See also; \\
[[techtalk:ih:oil03b#check_valve_dims|Check Valve Dims]] \\
[[techtalk:ih:oil01#oil_pump_check_valve|More on how the check valve works]] \\

Made by Circle Seal. \\
Manufacturer Part# P106-376.\\
HD Part# (26435-76A). \\
Patent #3626977. \\

The check valve has an arrow pointing up with FC to the bottom left of the arrow. \\

    * The oil pump check valve plays a role in the operation of the oil pressure switch.
    * It also stops oil from entering the engine when the engine is shut off (in theory).
    * The check valve had 2 different part numbers.
      * The original was (26435-76) in 1977. 
    * The part number was upgrade (26435-76A)  for L77-78 models ((1954-1977 HD Sportster XLH/XLCH-1000 Parts Catalog Supplement (99451-77A) )) ((1954-1978 HD Sportster XLH/XLCH-1000 Parts Catalog Supplement (99451-78) )) ((1954-1977 HD Sportster XLH/XLCH-1000 Parts Catalog pg 23 (99451-78A) )) 
    * Speculation could say...,
      * The original check was for the special "1600" pump (discontinued L77).
      * And the upgraded check was for installation in a newer, non publicized, pump casting not cataloged.
    * Either way, the upgraded check valve was used through 1985 on IHs.

|{{:techtalk:ih:oil:26435-76a_check_valve_-cropped-_by_dirtycory.jpg?direct&200|}}|{{:techtalk:ih:oil:77-85_oil_check_valve_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_check_valve_6_by_hippysmack.jpg?direct&300|}}|
|  26435-76A check valve ((photo by DirtyCory of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071153&page=2))  |  With the O-ring removed, you can see the crimped 2-piece body design ((photos by Hippysmack))  ||

|{{:techtalk:ih:oil:77-85_oil_pump_check_valve_bore_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_check_valve_installed_by_hippysmack.jpg?direct&300|}}|
|  The check valve sits inside the bore in the pump body as shown. Installed position (R)((photo by Hippysmack))  ||


===== In search of a comparable check valve =====
**The closest on the Circle Seal website** is a [[http://www.circle-seal.com/products/check_valves/c2900/index.html|2900 series cartridge check valve]]. \\
Click on the 2900 series in the catalog section to the left on the their site.

In the Products-Engineering-Terminology PDF; \\ 
<blockquote>Flow capability (Cv=0.55).
Flow capability indication commonly accepted by the valve industry.
The literal definition is that a component with a Cv of one (1); \\
Can flow one (1) gallon of water with a ΔP of one (1) PSI. \\
The calculated results from Cv equations must be considered reasonable approximations only.</blockquote>

**Link to the Circle Valve site with comparable dims and specs**: \\
[[https://catalog.circlevalve.com/item/check-valves/c2900-series-cartridge-check-valve-0-to-3000-psig/cs-c2949b-4q]] \\
This one has a back-up O-ring on the valve. \\
That link came from this XLF thread: \\
[[http://xlforum.net/forums/showthread.php?t=1979566&highlight=gerotor&page=2]]


====== Oil Pressure Switch ======
See also; \\
[[techtalk:ref:trouble07|Tesing the Oil Pressure Switch]] \\
[[techtalk:ih:oil01#oil_pressure_switch|More on How the Ironhead Oil Pressure Switch Works]] \\

(26554-77) Oil pressure switch was used on L-77 to 90 models. \\

On 77-85 models, it was mounted at the oil pump and later mounted to the filter pad on 86-90 models. \\
The oil pressure switch was listed in the -77A parts supplement catalog. \\
However, it was listed as a L77 addition in the -78 parts supplement. \\
The circumstance of this switch being a late addition is unclear. \\
However, there was a wiring harness upgrade in 78 and an oil pressure gauge available for 77-78 models. \\
Double nuts (7638) for the oil pressure switch were also a late addition part #. \\
(retainer for the wire to the oil light) \\

|{{:techtalk:ih:oil:oil_pressure_switch_0_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:oil_pressure_switch_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:oil_pressure_switch_3_by_hippysmack.jpg?direct&300|}}|
|  Oil pressure switch (26554-77) ((photos by Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071153&page=8))  |||





\\


[[:techtalk:menu|{{:techtalk:gototechnicalmenu.jpg|}}]]
Trace: • IH: General Technical Information • REF: General-MSR 11 • MiscRes: Magazine Articles • EVO: Carburetor, Intake Manifold & Exhaust - Sub-02B • REF: Carburetor, Intake Manifold & Exhaust - Sub-01J • W E L C O M E ! • REF: Tools - 155 • EVO: Oiling & Lubrication - Sub-04K • REF: Tools - 167 • REF: Service Procedures 9P