Re: Generic Oil Pressure

Posted by Ken McWilliams on November 30, 2000 at 04:09:25 from (38.232.245.127):

In Reply to: Generic Oil Pressure posted by Pete in Post Falls on November 29, 2000 at 21:26:52:

Pete,

There are a lot of factors involved and difficult to describe in one broad stroke.

There are lots of different oil circulation designs. Some of the older tractors have filters seemingly as an after thought. These were designed to only send a percentage of oil through the filter and, thus, different ways of pumping and directing.

Generally, a cold engine will have higher pressure than when hot.
Different manufacturers designed for different oil pressures. My CASE is 20 PSI, my John Deere is 50 PSI.
Higher viscosity or "weight" oil will carry higher pressure: IE, 20W50 will show higher pressure than 5W30 when hot.
As a rule, at idle on a worn engine you need to see the needle to at least come off the peg. At higher RPM's, I wouldn't be comfortable without seeing at least 15 PSI on a worn engine.
The criteria for judging is what was it when it was new and what is it now. If it was 30 PSI when new (or manufacturer's specification) and now will only give 15 PSI, then the pump or engine bearings are well worn.
One thing to consider, however, is whether or not the by-pass valve is stuck open.
Only a diagnosis by you can determine what is needed.
Ken McWilliams
Dayton, OH

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