[Healeys] Feeling Pressured

[David Nock BCS]

There are two return drains for the relief valve. One is the large pipe that will not plug up. The other is a small one that if you put silicone on the pan gasket will plug up. It is where the pan gasket has a small cut out to go around. I also have seen some of the aftermarket alloy oil pans that did not have a large enough cut out to clear the hole.



David Nock
British Car Specialists
209-948-8767
www.britishcarspecialists.com

From: Corning, Dan (D.C.) 
Sent: Wednesday, May 02, 2018 11:08 PM
To: healeys at autox.team.net 
Subject: [Healeys] Feeling Pressured

I’m trying to diagnose why my BT7s oil pressure too high after rebuilding the engine.  With the spark plugs removed, engine cranking oil pressure builds to 90 PSI.  I did install a high capacity oil pump from Healey Surgeons but I don’t think that is the root of the issue.  I’ve never started the engine after the rebuild and won’t until I get this resolved.

Looking through the archives for similar problems led to the possibility the oil pressure relief return port was covered during the rebuild, blocking the return of oil to the sump.  To test this, I pulled the oil pressure relief valve and spring, put the plug back in and cranked the engine.  The cranking oil pressure dropped significantly, low enough that it didn’t register on the gauge.  If I’m correct, that eliminates the return port as the problem because if they WERE plugged, the oil return still would have been blocked and the pressure would have still been high.  I suspect it’s now more likely the pressure relief valve is sticking in the bore or simply too much spring pressure keeping the valve closed.  

I trial fitted the pressure relief valve back in the engine bore and didn’t feel any binding although the valve did have some scoring.  Reviewing each component, I noticed the spring fits nicely inside the back side of the pressure relief valve but does not fit INTO the cavity inside the plug.  (see photo) Is it possible I have the wrong plug?  Maybe switched the oil pan plug with the pressure relief plug forcing the spring too far into the pressure relief bore?

Any ideas that might help me pinpoint the concern?

 
Best, 

Dan Corning



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