Could the oil pressure relief valve be stuck open or have a bad seat?
Bruce Kettunen
bekett@uslink.net
Mt. Iron, MN
>I need some expert advice. I have a 350 4 bolt main that I personally
>rebuilt and installed in my truck. When I start it ,it has 60# + of oil
>pressure but when I drive it a few miles (4-5) and stop at a red light or
>something the oil pressure will drop to 0-10# when idling. As soon as I
>accelerate it will shoot up to 40# and settle back to 25-30# when cruising
>down the highway at 2000 rpm. It had a brand new Melling standard oil pump
>that I have already replaced with another Melling standard oil pump. I have
>never used one of these before. In the past I have always used Chevy oil
>pumps and don't remember ever seeing this much pressure fluctuation and
>those low of readings. Does anybody have any ideas what could be wrong? Is
>this normal for Melling oil pumps? Should I replace it with a Chevy pump?
>Could there be some other problem? I Plasticgaged the bearings when I
>assembled it and everything was on the minimum side of the tolerances. Also
>I am running 10W40 oil. Any help or suggestions would be appreciated. I
>really am not looking forward to taking the engine out and completely
>rebuilding it again just to try and find this problem. TIA>
>
>
>Terry Stellman
>1949 3600
>Missouri City, Texas
>
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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