| Both sides previous revisionPrevious revision |
techtalk:ih:oil03b [2019/08/05 13:00]
– [IH: Oiling & Lubrication - Sub-03B] ixl2relax |
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techtalk:ih:oil03b [2024/01/01 18:23] (current)
– hippysmack |
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| ====== Roll Pin Dims ====== |
| |{{:techtalk:ih:oil:77_oil_pump_roll_pin_dim_1_by_hippysmack.jpg?direct&300|}}| |
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| ====== Gear Shaft Dims ====== |
| The same gear shaft part number (26488-75) was used from 77-90. \\ |
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| However, there are variations of the exact length of the shaft. \\ |
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**Reported Dims**: ((DirtyCory of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/194881-let-s-study-the-77-85-oil-pump-parts-and-changes-and-when/page8?t=2071153&page=8)) \\ |
| The shaft lengths reportly vary from around 4.160" to 4.205". \\ |
| The shaft diameters vary from 0.495" to 0.496". \\ |
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| Distance from drive gear to retaining ring groove 2.580". \\ |
| The only difference in markings on the 2 shaft lengths other than the length itself is the hash marks on top of the gear. \\ |
Also noticed was that some of the holes in the gearshaft for the pins are drilled to different depths. ((DirtyCory of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/194881-let-s-study-the-77-85-oil-pump-parts-and-changes-and-when/page3?t=2071153&page=3)) \\ |
| |{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_comparison_1_by_dirtycory.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_comparison_2_by_dirtycory.jpg?direct&300|}}| |
|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 httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/194881-let-s-study-the-77-85-oil-pump-parts-and-changes-and-when/page8?t=2071153&page=8))| Lengths slightly different. ((photo by DirtyCory of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/194881-let-s-study-the-77-85-oil-pump-parts-and-changes-and-when/page8?t=2071153&page=8)) | |
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| The dims in the pics below were taken on a driveshaft from a used 79 oil pump. ((photos by Hippysmack)) \\ |
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| |{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_bushing_dim_3_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_bushing_dim_5_by_hippysmack.jpg?direct&300|}}| |
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| ====== Gear Shaft Retaining Ring Dims ====== |
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| |{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_retaining_ring_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_gear_shaft_retaining_ring_2_by_hippysmack.jpg?direct&300|}}| |
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| ====== Gear Shaft Pin Dims ====== |
| Gear shaft pin (26430-76) \\ |
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| Different pins were mic'd and the dims noted as below: \\ |
| |{{:techtalk:ih:oil:gearshaft_pin_dims_by_dirtycory.jpg?direct&200|}}| |
| Various pin lengths noted using \\ NOS and used pins ((photo by DirtyCory of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/194881-let-s-study-the-77-85-oil-pump-parts-and-changes-and-when/page3?t=2071153&page=3)) | |
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| Below are more dims (parts from taken from a 79 oil pump). |
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| It's easy to rock it out of square with the gerotor. |
| |{{:techtalk:ih:oil:77-85_oil_pump_feed_gerotor-checking_tolerance_by_6_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_feed_gerotor-checking_tolerance_by_7_hippysmack.jpg?direct&300|}}| |
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| ===== Return (scavenge) Gerotors ===== |
| **77-E83 Chamfered Return Gerotors** \\ |
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| ✔ Maximum wear limit between the inner and outer gerotor set is .004" ((70-78 Sportster FSM pg 3-27)) |
| |{{:techtalk:ih:oil:77-85_oil_pump_gerotors-checking_tolerance_2_by_hippysmack.jpg?direct&300|}}| |
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| ====== Separator Plate Dims ====== |
| |{{:techtalk:ih:oil:outer_plates_by_dirtycory_-_annotated.jpg?direct&500|}}| |
| Outer plate comparison ((photo by DirtyCory of the XLFORUM httphttps://www.xlforum.net/forumsforum/showthread.phpsportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/194881-let-s-study-the-77-85-oil-pump-parts-and-changes-and-when?t=2071153)) | |
===== Inner Plate ===== |
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| ===== Inner Plate ===== |
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| |{{:techtalk:ih:oil:77-85_oil_pump_inner_separator_plate_dim_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_inner_separator_plate_dim_6_by_hippysmack.jpg?direct&300|}}| |
