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techtalk:ih:oil03q [2021/11/11 00:29] hippysmack [77-85 Oil Pump General Wear and Damage Issues] |
techtalk:ih:oil03q [2024/05/07 20:49] (current) hippysmack [Damaged Pump Housing Roll Pin] |
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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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| * **Gerotors can crack but still work to a point**. \\ That point may be where it finally wears out the pump housing to gerotor OD clearance thus delivering less oil to the motor. \\ There is no spec for gerotor to housing clearance. \\ But even hairline cracks in a gerotor will allow it to expand when hot. \\ This will eat away at the housing bore, heat up the pump and internals causing damage to other pump parts as well. \\ Cracked gerotors will also produce less oil pressure. | * **Gerotors can crack but still work to a point**. \\ That point may be where it finally wears out the pump housing to gerotor OD clearance thus delivering less oil to the motor. \\ There is no spec for gerotor to housing clearance. \\ But even hairline cracks in a gerotor will allow it to expand when hot. \\ This will eat away at the housing bore, heat up the pump and internals causing damage to other pump parts as well. \\ Cracked gerotors will also produce less oil pressure. | ||
| * **Gearshaft pins can shear off, stopping either the feed side or return side or even both from turning**. \\ The solid pins in the side of the gearshaft are responsible for turning the gerotors. \\ The pins will wear and sometimes they will shear off. Each gerotor set has it's own pin. \\ So it's possible for the pin on the return side to shear with the pin on the feed side staying in tact or vice-versa. \\ So you could have feed oil to the motor but no oil return to the tank or vice-versa. \\ Always check for oil returning to the tank when diagnosing any suspected oiling issues (or any time after checking the oil for that matter). \\ Never check oil level without the motor being up to operating temp. \\ So before you shut the motor down to check the oil, have a look in the tank to verify that oil is returning. | * **Gearshaft pins can shear off, stopping either the feed side or return side or even both from turning**. \\ The solid pins in the side of the gearshaft are responsible for turning the gerotors. \\ The pins will wear and sometimes they will shear off. Each gerotor set has it's own pin. \\ So it's possible for the pin on the return side to shear with the pin on the feed side staying in tact or vice-versa. \\ So you could have feed oil to the motor but no oil return to the tank or vice-versa. \\ Always check for oil returning to the tank when diagnosing any suspected oiling issues (or any time after checking the oil for that matter). \\ Never check oil level without the motor being up to operating temp. \\ So before you shut the motor down to check the oil, have a look in the tank to verify that oil is returning. | ||
| - | * **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. | + | |
