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Roger
02-03-2004 11:21:33
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Re: Quincy compressor oil pump in reply to Howard, 02-02-2004 15:06:57
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Quincy vane pumps are designed to be self-reversing, that is, no matter which way you set the pump to run, the oil pump adjusts itself to pump correctly in either direction. This is NOT the case with the later gerotor type oil pumps. If the oil pump is not working, the self-adjusting sleeve inside the pump may be stuck in place and not adjusting to the proper position. The rotor and vanes run inside this circular sleeve, which has oil ports cut into it. When the pump starts up, the friction betwen the vanes and the sleeve pulls the sleeve in the direction of rotation until the correct oil ports are lined up, and the second set of oil ports are closed. If the pump is ever reversed, the sleeve moves with the vanes until the other set of ports are uncovered. The amount of movement of the sleeve is dictated by a small roll pin inserted in the main crankcase. If this sleeve sticks in the wrong position, or does not fully rotate to the proper position, you will have no oil pressure. In this case, just remove the flat cover plate on the end of the crank and lightly tap the sleeve with a center punch to rotate it fully to the correct position. Other sources of grief are worn o rings on the oil pump shaft at the end of the crankshaft, oil pressure regulator set too low, worn bushings in the oil pump, worn o ring for the cover plate, worn o rings in the hydraulic unloader, a worn aluminum gasket behind the nut at the bottom of the crankcasecase which holds the oil screen, worn out gasket between the oil syphon tube and the rear bearing carrier, and a plugged oil intake syphon screen or line. If you have excessive crankcase vacuum, you will also have little or no oil pressure.
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