Differences
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techtalk:evo:oil03i [2018/12/23 14:38] hippysmack [Gearshaft] |
techtalk:evo:oil03i [2018/12/24 00:35] hippysmack [Separator Plates] |
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So, the exact length shouldn't be an issue for the gerotors. \\ | So, the exact length shouldn't be an issue for the gerotors. \\ | ||
- | The installed lower pin also holds the outer plate in the pump body. \\ | + | The installed upper pin holds the gearshaft in the pump body during disassembly. \\ |
- | + | The length of this pin shouldn't be an issue for the gearshaft. \\ | |
- | The installed upper pin holds the gearshaft in the pump body. \\ | + | The retaining ring and return gears set the upper positioning of this pin inside the pump. \\ |
- | The length of this pin can be an issue. \\ | + | |
- | Too short and it won't keep the gearshaft in the pump. \\ | + | |
There is a clearance between the pump bore and the gearshaft. \\ | 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. \\ | 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. \\ | 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 pin can scratch the aluminum sides. \\ | + | 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 tear the 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. \\ | ||
|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_pins_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_pins_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_pins_3_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_pins_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_pins_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-90_oil_pump_gearshaft_pins_3_by_hippysmack.jpg?direct&300|}}| | ||
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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. \\ | ||
- | |{{:techtalk:evo:oil:86-90_oil_pump_separator_plates.jpg?direct&300|}}| | + | |{{:techtalk:evo:oil:86-90_oil_pump_separator_plates_by_hippysmack.jpg?direct&300|}}| |
| Separator plate locations ((photo by Hippysmack)) | | | Separator plate locations ((photo by Hippysmack)) | | ||