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| techtalk:evo:oil03i [2018/12/23 14:18] – [Oil Pump Body] hippysmack | techtalk:evo:oil03i [2024/01/05 03:43] (current) – hippysmack | ||
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| ====== EVO: Oiling & Lubrication - Sub-03I ====== | ====== EVO: Oiling & Lubrication - Sub-03I ====== | ||
| ====== 86-90 Oil Pump (26204-86) Individual Parts and Pics ====== | ====== 86-90 Oil Pump (26204-86) Individual Parts and Pics ====== | ||
| + | See also See also [[techtalk: | ||
| ====== Oil Pump Body and Cover ====== | ====== Oil Pump Body and Cover ====== | ||
| ===== Oil Pump Body ===== | ===== Oil Pump Body ===== | ||
| - | * The HD catalog part number | + | * The pump body is HD catalog part number (26484-86) |
| * The body casting number is (26485-) | * The body casting number is (26485-) | ||
| * The casting number is in return cavity. | * The casting number is in return cavity. | ||
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| ===== Oil Pump Cover ===== | ===== Oil Pump Cover ===== | ||
| - | |||
| * The bottom cover is HD catalog number (26486-86). | * The bottom cover is HD catalog number (26486-86). | ||
| * The casting number (26487-86) is in the feed cavity. | * The casting number (26487-86) is in the feed cavity. | ||
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| |{{: | |{{: | ||
| - | ===== Gearshaft ===== | + | ====== Gearshaft ====== |
| + | The gear shaft part number (26488-75) was used from 77-90. \\ | ||
| + | The gear has 20 teeth. \\ | ||
| + | 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. \\ | ||
| |{{: | |{{: | ||
| - | ===== Gearshaft Retaining Ring ===== | + | ====== Gearshaft Retaining Ring ====== |
| + | Gear shaft retaining ring (26497-75) was used on 77-90 model oil pumps. \\ | ||
| + | It keeps the inner plate, return gerotors and gearshaft locked in the pump. \\ | ||
| + | It also sets the lowest position for the inner plate and return gerotors inside the pump. \\ | ||
| |{{: | |{{: | ||
| - | ===== Gearshaft Pins ===== | + | ====== Gearshaft Pins ====== |
| + | The gear shaft solid pin (26430-76), was used in 77-90 oil pumps. \\ | ||
| + | The diameter and lengths of the pins vary. \\ | ||
| + | The shaft pins don't have to run out and touch the gerotors. \\ | ||
| + | They simply turn both gerotors at the same time. \\ | ||
| + | So, the exact length shouldn' | ||
| + | |||
| + | The installed upper pin holds the gearshaft in the pump body during disassembly. \\ | ||
| + | The length of this pin shouldn' | ||
| + | The retaining ring and return gears set the upper positioning of this pin inside the pump. \\ | ||
| + | There is a clearance between the pump bore and the gearshaft. \\ | ||
| + | The upper gearshaft bushing does reach to the end of it's bore in the housing where the pin resides. \\ | ||
| + | So, there is extra clearance between the gearshaft and pump housing bore. \\ | ||
| + | After the retaining ring comes out, the shaft can drop into this tapered bore clearance and the lower pin can scratch the aluminum sides. \\ | ||
| + | |||
| + | The installed lower pin also holds the outer plate in the pump body. \\ | ||
| + | The length of this pin could be a potential issue under the right conditions. \\ | ||
| + | Too short and it could get make it's way into the hole in the plate and upset the center of the pressed in seal. \\ | ||
| + | This could induce slop in the plate and allow it to try to spin the plate against the roll pin in the body. \\ | ||
| + | As well as create a leak from the feed side and allow oil to float up into the engine thru the gearshaft bore. \\ | ||
| |{{: | |{{: | ||
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| The plates are separated by a spring washer that puts tension against each plate in opposite directions. \\ | The plates are separated by a spring washer that puts tension against each plate in opposite directions. \\ | ||
| Thus sealing off the feed and scavenge sections. \\ | Thus sealing off the feed and scavenge sections. \\ | ||
| - | |{{: | + | |{{: |
| | Separator plate locations ((photo by Hippysmack)) | | Separator plate locations ((photo by Hippysmack)) | ||
| Line 57: | Line 86: | ||
| ====== Outer Plate ====== | ====== Outer Plate ====== | ||
| - | |||
| The outer plate is the bottom plate (with the pump installed). \\ | The outer plate is the bottom plate (with the pump installed). \\ | ||
| The feed gerotors sit under this plate. \\ | The feed gerotors sit under this plate. \\ | ||
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| Notice the difference of the cut out or recessed area of the inside diameter of the outer plates. \\ | Notice the difference of the cut out or recessed area of the inside diameter of the outer plates. \\ | ||
| - | This is for the different style of seals. ((DirtyCory of the XLFORUM | + | This is for the different style of seals. ((DirtyCory of the XLFORUM |
| Either plate will fit 77-90 oil pumps with their respective seals. \\ | Either plate will fit 77-90 oil pumps with their respective seals. \\ | ||
| |{{: | |{{: | ||
| - | | Outer plate comparison ((photo by DirtyCory of the XLFORUM, annotated by Hippysmack | + | | Outer plate comparison ((photo by DirtyCory of the XLFORUM, annotated by Hippysmack |
| |{{: | |{{: | ||
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| * It is pressed into the outer plate hole. | * It is pressed into the outer plate hole. | ||
| + | The seal below is used and partially destroyed upon removal. \\ | ||
| |{{: | |{{: | ||
| | Outer plate seal (12036A) (destroyed during removal) ((photos by Hippysmack)) | | Outer plate seal (12036A) (destroyed during removal) ((photos by Hippysmack)) | ||
| Line 95: | Line 123: | ||
| | Spring washer (26461-77) ((photos by Hippysmack)) | | Spring washer (26461-77) ((photos by Hippysmack)) | ||
| - | |{{: | + | |{{: |
| | Spring washer location between the plates ((photo by Hippysmack)) | | Spring washer location between the plates ((photo by Hippysmack)) | ||
