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techtalk:ih:oil03c [2018/12/12 02:51] hippysmack [77-85 Oil Pump Damage Pics] |
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| - | ====== IH: Oiling & Lubrication - Sub-03A ====== | ||
| - | ====== 77-85 Oil Pump Damage Pics ====== | ||
| - | |{{:techtalk:ih:oil:83_oil_pump_by_sc72.jpg?direct&300|}}|{{:techtalk:ih:oil:77_oil_pump_gearshaft_pin_broke_by_77_iron.jpg?direct&500|}}| | ||
| - | | Oil pump from an 83 model ((photo by sc72 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1717592&page=15)) | Gearshaft pin broke off into this 77 model ((photo by 77 iron of the XLFORUM http://xlforum.net/forums/showthread.php?t=1831941&page=2)) | | ||
| - | * Many used oil pumps have scratches on both the gerotors and pump surfaces that the gerotors ride on. | ||
| - | * But, there is one certain spot that seems to be scratched more times than others. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?t=2071153&page=6)) | ||
| - | * It's on the larger of the two pads in the pump body and the cover seem to usually have more wear. | ||
| - | * Sometimes, the small pad is scratched or damaged also but not always. | ||
| - | * The gap between the inner and outer gerotors on both the feed and return sides tends to be scratched as in the pics below. | ||
| - | * Debris caught between these two gears cannot slide over and fall to the other cavity and out of the pump. | ||
| - | * It gets locked between the gears and ripped across the aluminum surface. | ||
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| - | |{{:techtalk:ih:oil:77-85_oil_pump_cover_11_by_hippysmack.jpg?direct&500|}}|{{:techtalk:ih:oil:77-85_oil_pump_cover_12_by_hippysmack.jpg?direct&500|}}| | ||
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| - | |{{:techtalk:ih:oil:77-85_oil_pump_cover_7_by_hippysmack.jpg?direct&500|}}|{{:techtalk:ih:oil:77-85_oil_pump_cover_8_by_hippysmack.jpg?direct&500|}}| | ||
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| - | * The inner gerotor spins in this same position as it is mounted to the gearshaft. | ||
| - | * The outer gerotor spins by way of the gears inside the cover but also in the same position to the inner gear as below in operation. | ||
| - | * The gearshaft is off center to the outside gerotors on both feed and return. | ||
| - | * There are 8 teeth on the inner and 9 on the outer gerotor in each set. | ||
| - | * This allows for the cavity between the inner and outer gears for oil transfer. | ||
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| - | In theory, no particles of any size should be able to spin around to the small pad due to the pressure generated by the spring washer and the gerotor spacing there. | ||
| - | The side toward the motor is where oil is transferred to and from the pump. | ||
| - | The inner and outer gears come together on the other side (right side). | ||
| - | This spacing relationship doesn't change between the motor side or the outside of the pump due to the offset gearshaft. | ||
| - | Left side of 1st pic below goes toward the motor. | ||
| - | |{{:techtalk:ih:oil:77-85_oil_pump_cover_9_by_hippysmack.jpg?direct&500|}}|{{:techtalk:ih:oil:77-85_oil_pump_cover_10_by_hippysmack.jpg?direct&500|}}| | ||
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