Re: Oil Pressure and...

Posted by Owen_Dyneto On 2009/6/28 17:38:59

Just so you understand shimming the spring in the relief valve of the pump only raises the maximum that the pump can produce before the relief valve opens. The amount of clearances in bearings etc. are the "leakages" and thus if shimming the pump doesn't raise the pressure, you're left with excessive bearing clearances or much less likely, a worn pump. But if the pump looks like it might have been off or serviced recently, you might remove it and check to see if too-thick a gasket was installed - this will dramaticaly drop the pressure by allowing the oil a "short circut" path across the face of the gears. At the same time, check to see if the cover plate is badly scored which would allow the same thing - if so it can be surface ground or a new one located. The gasket on the cover plate should be VERY thin.

The only pump "adjustment" was limited to the installation of a new spring.