In reply to a message from George Parker sent Wed 11 Aug 2004:
George,
Possibly a speck of dirt got into the bypass valve seat, or else
the gasket did not make a good seal on some internal webs.
Or worse, you used silicone RTV seal on the gasket, and too much,
it has formed little balls or worms, and one of these is caught up
in the relief valve – or worse, the oil passages. This area is a
really bad place to use RTV, and it’s always a real danger to use
more than the very minimum.
Finally, there is always the possibility that the pressure sensor
decided to stay on vacation once it was out.
Could you clear up what readings you are getting? You say at 1000
RPM it reads 10-20 PSI, and that the pressure drops with RPM –
gee, how low does it get?
10-20 PSI is about right for idle, actually, but that would
generally be below 1000 RPM, 500 RPM is the specification.
Do you have a mechanical gauge? It’s always a good idea to plumb
one in to check the gauge. The factory gauge fails more often than
the oil pressure does, generally. The Jaguar Enthusiasts Club in
the UK sells a modern Smiths replacement that looks identical to
the original gauge, but has non-Rube Goldberg innards.
My strategy for your problem would be to open the block up again
and carefully clean out and check the condition of the relief
valve – the one inside the spigot that runs to the sump through
the external rubber hose. Parts are still available for this
valve, and it’s very often the cause of problems like yours. If it
still causes concern, then I’d check the gauge.–
Jerry Mouton
Palo Alto, California, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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