Could some of you engine experts please check out my understanding of the effects of a stuck
oil pump relief valve :
1. A relief valve stuck in the fully closed position may result in very high
oil pressure.
2. A relief valve stuck in the fully open position will result in little or no
oil pressure, since the pump flow is dumped immediately back to the sump.
3. Now the most interesting one: A relief valve that is stuck in an intermediate position that blocks part of the relief port can result in reduced, but still acceptable oil pressure. In this scenario, the partially open port acts like a small leak, but the pump is able to handle that "leak" and still supply adequate oil to the bearings, etc.
Right, wrong, somewhere in between? Thanks.
Jerry aka CWizard