Posted by pete 23 on May 31, 2009 at 08:22:34 from (173.87.14.132):
In Reply to: H low oil pressure posted by CJ_1080 on May 30, 2009 at 16:29:40:
I noticed your max oil pressure was also low that is one reason I suggest checking the relief valve plunger. This is almost exactly the psi you will see with cold oil and wrong plunger and it will drop very low at warm low idle. An H and M carry well over 60 psi normally warm or cold at moderate engine speeds. When you are looking at the relief valve you will get a chance to check pump end clearance and shaft wear also. The relief valve I am talking about was sold during the 50's over the counter, don't know if they were mispackaged or what but they found their way into many tractors. The MD through 450 D carried about 40 psi and also used a different oil pressure gauge calibrated for that pressure.. Always check easy things first and proceed from there.
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