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Old 03-29-2006, 06:22 PM
CWizard CWizard is offline
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Join Date: Apr 2005
Location: Near Chattanooga, TN
Cobra Make, Engine: SPF, 418 Stroker
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Default Effects of Stuck Oil Pump Relief Valve

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
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