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Thread: Blow by

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

    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
    Everett, WA

    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
    Join Date
    Mar 2009
    Tampa Bay

    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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