Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision | Next revision Both sides next revision | ||
|
techtalk:ih:oil03c [2018/12/12 02:51] hippysmack [77-85 Oil Pump Damage Pics] |
techtalk:ih:oil03c [2018/12/12 04:02] hippysmack [77-85 Oil Pump Damage Pics] |
||
|---|---|---|---|
| Line 2: | Line 2: | ||
| ====== IH: Oiling & Lubrication - Sub-03A ====== | ====== IH: Oiling & Lubrication - Sub-03A ====== | ||
| ====== 77-85 Oil Pump Damage Pics ====== | ====== 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. | * Many used oil pumps have scratches on both the gerotors and pump surfaces that the gerotors ride on. | ||
| Line 17: | Line 15: | ||
| |{{: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|}}| | |{{: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|}}| | ||
| - | * The inner gerotor spins in this same position as it is mounted to the gearshaft. | + | * 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 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. | + | * Also, any debris picked up from the source side cavity should drop down into the feed side cavity and out of the pump. |
| - | * The gearshaft is off center to the outside gerotors on both feed and return. | + | * The side toward the motor is where oil is transferred to and from the pump. |
| - | * There are 8 teeth on the inner and 9 on the outer gerotor in each set. | + | * The inner and outer gears come together on the other side (right side). |
| - | * This allows for the cavity between the inner and outer gears for oil transfer. | + | * This spacing relationship doesn't change between the motor side or the outside of the pump due to the offset gearshaft. |
| + | |||
| + | * But in reality, debris gets caught in or between the gears and gets dragged over the aluminum flats. | ||
| + | * Some then find their way under the gerotors while the spring washer flexes from the stress. | ||
| + | * The debris spins around under the gerotors and wears scratches in the flats (pads) or worse. | ||
| + | |||
| + | |{{:techtalk:ih:oil:77-85_oil_pump_cover_9a_by_hippysmack.jpg?direct&500|}}|{{:techtalk:ih:oil:77-85_oil_pump_cover_10a_by_hippysmack.jpg?direct&500|}}| | ||
| + | | Gerotor rotation ((photos by Hippysmack http://xlforum.net/forums/showthread.php?t=2071153&page=6)) || | ||
| + | |||
| + | |{{: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)) | | ||
| - | 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. | + | * There should be some reduced pressure because of the scratches. |
| - | The side toward the motor is where oil is transferred to and from the pump. | + | * Pressure generated to the output cavity can squirt back to the input side through these scratches. |
| - | The inner and outer gears come together on the other side (right side). | + | * How much pressure loss would depend on the width, depth, length of the scratches and oil viscosity. |
| - | This spacing relationship doesn't change between the motor side or the outside of the pump due to the offset gearshaft. | + | * To make the pump inoperative or not make pressure (from the scratches alone); |
| - | Left side of 1st pic below goes toward the motor. | + | * The scratches would have to be proportional to the relative volume of all four gerotor reservoirs combined. |
| - | |{{: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|}}| | + | * Then, the check valve would have to accept less pressure flow than the backpressure from the pump. |
| + | * The gerotor surface in the cover would have to be eat up pretty bad to make the pump completely ineffective. | ||
| + | * The pump would have less pressure loss with multi-weight or straight weight oil when cold than hot. | ||
| + | * They'll both flow faster when hot. | ||
