oil pump seals cavitate
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This is a discussion on oil pump seals cavitate within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; When removing crankshaft bolt crank rotated reverse about a quarter turn. I read that this would cavitate the oil pump ...

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    oil pump seals cavitate

    When removing crankshaft bolt crank rotated reverse about a quarter turn. I read that this would cavitate the oil pump seals. Are there any obvious ways of knowing this is the case short of removing the pump.

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    zax
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    Hmm, honestly I don't think you'll be rotating nearly fast enough to cavitate the oil.

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    We started in 5th with brake applied when rotation happened. then shifted to third with more brake pressure and bolt then came loose. the rotation was very gradual and just maybe a quarter of the way.

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    I thought cavitation would occur if the system were under pressure, and the system were then to suck air or for some reason not raise enough oil to cover the teeth of the pump's geared surfaces. In that case those gears would wear and eventually pump efficiency would fall, oil pressure would no longer follow need, and either the pump or the motor would fail. Since your motor was not operating, you neither had nor needed significant oil pressure. If you are concerned you can measure oil pressure but that'd involve turning on the motor. I don't know of a way to spin the pump up enough to check pressure. I also don't think it's a rare event to have the crank rotate a bit before the owner can break the crank bolt loose. My guess would be it's fine for what that's worth.

    We started in 5th with brake applied when rotation happened. then shifted to third with more brake pressure and bolt then came loose. the rotation was very gradual and just maybe a quarter of the way.
    I've been thinking about this and don't understand it as a result. This implies you managed to move the car itself, while in the tallest gear with the brakes applied and loaded with a passenger, and while you were standing in front of it, using only hand tools to rotate the crank.
    Last edited by SD_GR; 04-04-2014 at 11:04 AM.
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    Now that when you think about, does make you scratch your head. Off pavement on a grade and aged tires.

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