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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