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techtalk:ih:oil03q [2021/11/11 00:16] hippysmack [IH: Oiling & Lubrication - Sub-03Q] |
techtalk:ih:oil03q [2021/11/11 00:29] hippysmack [77-85 Oil Pump General Wear and Damage Issues] |
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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. | ||
