Steve,
good thing I stopped by my machine shop this morning. I just happen
to be working on the mod for the pressure relief valve and I wanted to
find out what the stock pring pressure was on the valve. I thought it
would be somewhat high, since it seemed to take a little effort to push
in the plunger. Not so, on both the valves I tested the PSI was less
than 10 lbs. One was around 8 lbs PSI & the other was 6. The plungers
on both move freely, with no sticky feeling.
It is my understanding that when the pressure gets too high the
plunger moves in, opening the large hole on the side of the valve,
allowing the excess pressure to dump. I would suggest, as a test of a
faulty valve, plugging the valve hole with a bolt and then testing the
oil pressure. If it reads much lower then you know the valve is the
problem. If not, then it's somewhere else.
Christopher
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