Low oil pressure question
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Low oil pressure question

  1. #1
    Junior Member cafireater's Avatar
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    Default Low oil pressure question

    I am hoping that you can help me with this problem. Let me start with a little history, I had a motor built by Pro Marine in Lake Havasu, I just wanted a dependable bullet proof motor that would last a long time with a little bit of performance. I have a 21 foot Hawaiian with a Berkley jet. The first motor lasted just over 1 season before it had a catastrophic failure, after replacing basically the bottom end, crank, rods, pistons, cam shaft and oil pan, it ran fine for 1 season. At the beginning of last season It broke a rocker arm and I took it back and had the top end redone and ran fine for the summer.

    The last 2 times I took it out I notice that the oil pressure is low after it warms up, it used to run about 40 psi all the time, now it starts out about 40 psi until its warm then drops to below 15 psi and stays there. I also notice oil in the bilge (about a pint) but I do not see any leaks.

    I am running Torco 20/50 oil which was what Tom at Pro Marine recommended. I do not run the motor hard, short WOT runs, but mostly cruise under 4000 rpm.

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  3. #2
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    Default Oil pressure

    Have you changed gauges lately? Have you put a mech gauge on the engine to verify these readings.Have you removed the valve covers and checked for any metalic in the oil.Have you changed oil lately if so did you checked for a colapsed oil filter or any metalic in the oil filter. When you had the engine rebuilt did you get a build sheet with the engine to verify rod and main bearing clearance? What was the cause of the previous engine failures?

  4. #3
    Junior Member cafireater's Avatar
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    Happy New Year Greg
    I have not changed the gauge, I will put on a mechnical gauge and change the oil this week, and I was planning to go out to Elsinore next Saturday for the Tom Papp run. I will give you an update after that.
    The oil filter and oil looks clean, no metal in it. I will also look for the build sheet.
    Thanks!
    Ross

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  6. #4
    Junior Member cafireater's Avatar
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    Greg, thank you for the tips, it turns out my oil pressure gauge was off. I added a mechanical gauge and there was about 20 psi difference. I also found the oil leak at the remote oil filter line and took it out this weekend and it ran great.

    thanks again

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