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Thread: Blow by

  1. #1
    Hybrid booster
    Join Date
    Mar 2013
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    Wastelands of NJ
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    638

    Blow by

    Well along with smoking upon deceleration I'm also looking at blow by. It is enough to lift the dipstick and blow oil out the tube. A compression test showed 120 PSI across the board for all 4 cylinders. Guess I need rings but any other thoughts?

  2. #2
    turbo addict
    Join Date
    Jan 2006
    Location
    Everett, WA
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    6,366

    Re: Blow by

    You need to do a leak-down test. Static compression tells part of the story, but now you're guessing. It could be rings, it could be a hung valve, excessive valve guide clearance...etc. I have not seen it done, but I know you can combine the leak-down test with smoke to really see what's up.

  3. #3
    Hybrid booster
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    Mar 2009
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    Tampa Bay
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    338

    Re: Blow by

    The way I was taught to verify a ring problem is to do a compression test, then put a little oil in the cylinder, then do another compression test. If the compression shoots up, the rings are an issue. A leakdown test would only verify that you are losing compression into the crank case, not what in the combustion chamber is causing the leak. I agree with Reaper that it could be something other than rings, but pretty much all of them will require at least the top end of the engine being torn down.

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