Is there a plug already in the hole that did not come out?? You could be
pushing a plug in top of a plug.? It's happened before.? Don't ask me how I
know.Mike MacLean
On Thursday, May 3, 2018 4:21 AM, "Corning, Dan (D.C.)" <dcorning at
ford.com> wrote:
<!--#yiv6492519831 .yiv6492519831EmailQuote
{margin-left:1pt;padding-left:4pt;border-left:#800000 2px solid;}-->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 theroot 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 theplug 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 wouldhave 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
doesnot 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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