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techtalk:ih:oil03q [2021/11/11 00:16] hippysmack [IH: Oiling & Lubrication - Sub-03Q] |
techtalk:ih:oil03q [2024/05/07 03:55] hippysmack [77-85 Oil Pump General Wear and Damage Issues] |
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| **Note: Any time there is a question about the oiling system, FIRST MAKE SURE THERE IS OIL RETURNING TO THE OIL TANK**. \\ | **Note: Any time there is a question about the oiling system, FIRST MAKE SURE THERE IS OIL RETURNING TO THE OIL TANK**. \\ | ||
| If there is no oil returning, do not run the engine any longer until you've discovered why that is. \\ | If there is no oil returning, do not run the engine any longer until you've discovered why that is. \\ | ||
| - | Seeing oil returning to the tank is usually a good thing. It verifies that the return side of the pump is working. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=1974975&page=13)) \\ | + | Seeing oil returning to the tank is usually a good thing. It verifies that the return side of the pump is working. ((Hopper of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/183572-oil-light-flickering-at-55mph/page13?t=1974975&page=13)) \\ |
| (which verifies the drive gear that drives the shaft that drives both pumps is working) \\ | (which verifies the drive gear that drives the shaft that drives both pumps is working) \\ | ||
| On the old gear pumps, it is a pretty good indicator that oil is coming out, so oil must be going in. \\ | On the old gear pumps, it is a pretty good indicator that oil is coming out, so oil must be going in. \\ | ||
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| * **Possible causes of low or no oil to the motor or oil tank (discussing the oil pump only)**: | * **Possible causes of low or no oil to the motor or oil tank (discussing the oil pump only)**: | ||
| + | * **There have been reports of oil pump to case gaskets made with the feed hole punched out**. \\ This would keep feed oil from entering the motor. \\ Always check that before installing the oil pump on the motor. | ||
| * **Cracked gerotors or too much clearance between the inner and outer gerotors will lower outlet pressure / oil flow to the motor**. \\ The gerotors work by picking up oil from the inlet cavity and moving that oil to the outlet cavity. \\ As the gerotors turn, previous oil deposited in the outlet cavity is pressured to keep moving the next time the outlet cavity is filled on rotation. \\ If there is a crack in a gerotor or a wide clearance between inner and outer gerotors, pressure will be forced into these areas instead. \\ The crack may open up under pressure and let the oil out also. \\ Basically you lose some pressure on the outlet side as some oil is simply being transferred from the outlet side back to the inlet side of the pump. | * **Cracked gerotors or too much clearance between the inner and outer gerotors will lower outlet pressure / oil flow to the motor**. \\ The gerotors work by picking up oil from the inlet cavity and moving that oil to the outlet cavity. \\ As the gerotors turn, previous oil deposited in the outlet cavity is pressured to keep moving the next time the outlet cavity is filled on rotation. \\ If there is a crack in a gerotor or a wide clearance between inner and outer gerotors, pressure will be forced into these areas instead. \\ The crack may open up under pressure and let the oil out also. \\ Basically you lose some pressure on the outlet side as some oil is simply being transferred from the outlet side back to the inlet side of the pump. | ||
| * **An out of round gerotor bore in the housing or cover can reduce oil pressure**. \\ This equates to too large of clearance around the gerotor OD lessening the hydraulic seal. \\ This can be caused by the separator plates and/or gerotors getting sideways in their bores and wearing the surrounding aluminum. | * **An out of round gerotor bore in the housing or cover can reduce oil pressure**. \\ This equates to too large of clearance around the gerotor OD lessening the hydraulic seal. \\ This can be caused by the separator plates and/or gerotors getting sideways in their bores and wearing the surrounding aluminum. | ||
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| * **The roll pin in the oil pump housing can shear or pull out**. \\ This may be due to foreign matter in the feed or return cavities. \\ The feed gerotors are already under pressure due to the spring washer design alone. \\ Any foreign objects that enter the pump can increase the pressure against the outer plate. \\ From the return side, it can push the inner plate toward the feed side. From the feed side, it'll create more pressure on the feed side only. \\ If the extra pressure is enough to grab and spin the plate hard enough, that could be enough to knock the pin out of it's hole in the housing. \\ If the roll pin comes out, it will cause damage to the oil pump. \\ If it gets lodged between the inner and outer gerotors, it'll most likely crack the outer piece (weaker of the two pieces). \\ If it gets under the feed gerotors, it'll get dragged across the gerotor surface in the cover. \\ This will end up in scratches on the machined surface and lower oil pressure from the pump due to the scratches. \\ With the roll pin out, the outer plate under pressure can spin and wallow out the feed bore in the housing around the plate. | * **The roll pin in the oil pump housing can shear or pull out**. \\ This may be due to foreign matter in the feed or return cavities. \\ The feed gerotors are already under pressure due to the spring washer design alone. \\ Any foreign objects that enter the pump can increase the pressure against the outer plate. \\ From the return side, it can push the inner plate toward the feed side. From the feed side, it'll create more pressure on the feed side only. \\ If the extra pressure is enough to grab and spin the plate hard enough, that could be enough to knock the pin out of it's hole in the housing. \\ If the roll pin comes out, it will cause damage to the oil pump. \\ If it gets lodged between the inner and outer gerotors, it'll most likely crack the outer piece (weaker of the two pieces). \\ If it gets under the feed gerotors, it'll get dragged across the gerotor surface in the cover. \\ This will end up in scratches on the machined surface and lower oil pressure from the pump due to the scratches. \\ With the roll pin out, the outer plate under pressure can spin and wallow out the feed bore in the housing around the plate. | ||
| + | This roll pin was removed using electrical side cutters by XLF member, billeuze. ((https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/203361-oil-pump-split-pin-removal/page2)) \\ | ||
| + | Carefully protect the base and sides of the pump body. \\ | ||
| + | Odd parts were put inside the pump for a nice height for a fulcrum for the side cutters. \\ | ||
| + | I squeezed and pried it out. It took 4 or five pries to walk it all the way out. \\ | ||
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| + | {{:techtalk:ih:oil:1977-e1983_sportster_oil_pump_roll_pin_removal_pic1_by_billeuze.jpg?direct&400|}} {{:techtalk:ih:oil:1977-e1983_sportster_oil_pump_roll_pin_removal_pic2_by_billeuze.jpg?direct&400|}} \\ | ||
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| + | {{:techtalk:ih:oil:1977-e1983_sportster_oil_pump_roll_pin_removal_pic3_by_billeuze.jpg?direct&400|}} {{:techtalk:ih:oil:1977-e1983_sportster_oil_pump_roll_pin_removal_pic4_by_billeuze.jpg?direct&400|}} \\ | ||
