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low oil pressure

Discussion in 'Heavy Equipment' started by Jay brown, Feb 22, 2009.

  1. Jay brown

    Jay brown PlowSite.com Addict
    Messages: 1,783

    why does low oil pressure indicate a bad main bearing? or vice versa
  2. Milwaukee

    Milwaukee 2000 Club Member
    Messages: 2,180

    That where oil go though that. loose bearing you be lose oil pressure fast.
  3. Diagonal Brace

    Diagonal Brace Junior Member
    Messages: 13

    Oil pressure loss can also be caused by a faulty relief valve or weak oil pump.
  4. Bigfoot Brent

    Bigfoot Brent Senior Member
    Messages: 202

    If the main bearings are worn that is an increased distance(volume) between the crankshaft and the bearing. Increased volume means a decrease in pressure.
  5. framer1901

    framer1901 Senior Member
    Messages: 852

    Depends on where pressure is being checked at - Ford small blocks check after the front main bearing, other motors??

    Could be main bearings which will usually show a loss of pressure over time, the relief valve which shows up now or the pump which will do either.