Posted by John B. on May 31, 2009 at 06:46:43 from (38.114.64.179):
In Reply to: H low oil pressure posted by CJ_1080 on May 30, 2009 at 16:29:40:
The relief valve should work the same with cold oil or when hot so I wouldn't worry too much about the relief valve.
I would be more concerned with the bottom plate bolted to the oil pump. This will get worn over the years and this creates oil bypass internally, parts also expand with heat and it doesn't take much to lower the pressure of the oil.
This is most likely the problem since the oil pressure drops after it warms up. When oil pressure drops after warming up is an indication of worn parts or excess clearence between parts. When the oil warms up and gets thinner it can escape thru these smaller clearences and cause loss of oil pressure.
The oil system is like any other hydraulic circuit, if there is a leak pressure will drop.
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