Re: Packard TSB 56T-20 - Low Oil Pressure

Posted by PackardV8 On 2009/10/28 22:21:03

Adding another quart of oil simply covers up the open pressure relief valve port in the pump. it is a bandaid fix. It only REDUCES (NOT ELIMINATES) the air getting to the pump. Air can still get into the pump if the input shaft is worn sufficiently. But the amount of air is reduced enuf to cure the symptoms of clatter.

Effectively that is all the PMCC sump tube fix was. It was a CHEAP and dirty fix for the factory just to get around installing an expensive new pump.

THere IS enuf crankshaft clearence to allow for 1 qt. overfull. try it. Mite work. mite not. depends on other wear in the pump. it does NOT fix the pump. It only is a diagnostic or bandaid fix to get the customer out the door.