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Thread: Oil pressure too high.

  1. #1

    Oil pressure too high.

    I recently purchased a 1957 GMC Panel truck with a rebuilt 350 Chevy engine (Casting number 3970010 1968-79). It has TPI from an 87' Camero. OBDII. O2 Sensors. Crank position sensor. No Cats. and about 200 miles on it.

    At idle the oil pressure is almost 80 psi. and goes up from there when driven. This has caused the oil filler (with bypass) to push out. I think oil came out of the oil dip stick tube as well and has caused leaks from the timing chain cover and oil pan gasket.

    I have replaced the following: Oil filler with bypass. Oil filler seal. Oil dip stick seal. Timing chain cover. Oil pan gasket. PCV Valve. Oil filter, Oil filter bypass and installed a stock oil pump. The oil pump I pulled was not High Volume and did not have a hi pressure spring.

    The oil pressure has not changed. Any idea what might be causing the high pressure? Plumbing? Gaskets?

    Thanks, Bob

  2. #2
    Senior Member RACING JUNKIE
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    i wonder if you to have a few blocked oil ports which i seen make the oil pressure run high. :? i know my motor in my drag idles at like 45-50psi and i get like 90psi on the gas
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  3. #3
    Senior Member DYNO OPERATOR
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    Re: Oil pressure too high.

    I can't see oil pressure causing oil to come out off the dipstick tube or an oil pan gasket. That sounds more like a ventilation problem.

    TS1955

  4. #4
    Senior Member RACING JUNKIE
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    Re: Oil pressure too high.

    Quote Originally Posted by TS1955
    I can't see oil pressure causing oil to come out off the dipstick tube or an oil pan gasket.
    TS1955
    im thinking that is from using the wrone dipstick and oil lvl is too high
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  5. #5
    Senior Member RACING JUNKIE
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    Ventiation problem wouldn't cause the oil pressure to skyrocket, however if the cam bearings were in stalled incorrectly that could cause the high oil pressure. Tight bearing clearances could also be cause to high oil pressure, but would eventually fail. I would first try 5W30 oil. It's also possibly that the distributor housing is blocking the flow to the top end. Have you looked to see if you're getting oil to the rockers :?:

    Not advice just wondering.

    Zip.

  6. #6
    Senior Member RACING JUNKIE
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    Quote Originally Posted by zipper06
    Ventiation problem wouldn't cause the oil pressure to skyrocket, however if the cam bearings were in stalled incorrectly that could cause the high oil pressure. Tight bearing clearances could also be cause to high oil pressure,

    Zip.
    thats what i said too. :wink: i think the dip stick and pan gasket is from too much oil. :wink:
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  7. #7
    Senior Member DYNO OPERATOR
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    I wasn't refering to the excessive pressure just the oil coming out of the pan gasket, timing cover, and dipstick. But I see where Fast is coming from. I do agree with you Zip on the bearing clearance. As far as the cam bearing installation, I don't think the motor would last 200 miles with the cam bearings installed wrong. JMO

    TS1955

  8. #8
    Senior Member MASTER BUILDER
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    If it is a melling oil pump there were some problems that we ran into with the wrong tension by pass springs causing excessive oil pressure. If this does not change then check rod and main clearances.

  9. #9
    Senior Member RACING JUNKIE
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    A quick 2 cents worth here . .

    If he has extremely high Oil Pressure and has oil squirting out of the dipstick tube, he has TWO different problems . .

    Better find out how much oil he has in it first.

    Then figure out what (or why) the oil pump is being so efficient!

  10. #10
    Senior Member RACING JUNKIE TheYellaBrick's Avatar
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    That oil filter isn't ORANGE is it ?

    :shock: :shock:
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