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Compression leaks on compression check

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here Compression leaks on compression check

This topic contains 2 replies, has 2 voices, and was last updated by Nara Karu Nara Karu 2 months, 1 week ago.

  • Creator
    Topic
  • #963910
    Nara Karu
    Nara Karu
    Participant

    Recently timing belt of my son’s 2003 Mitsubishi Eclipse GT V6 slipped and we replaced it ourselves correctly with recommended way. After the the car started at the first attempt. As we hear some unusual noise, we stopped the motor and did a compression test. All 6 cylinders had compression over 150. But three cylinders couldn’t hold the compression and the gauge pressure went down slowly. Though I searched about the issue, I found it nowhere in the web. Would you please explain the situation we have faced and any solution. Thanks

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  • #963914
    Nightflyr *
    Richard Kirshy
    Participant

    I think it would be wise to perform a leak down test on each cylinder
    The results are pretty straight forward:
    With both valves in the closed position (TDC) for each cylinder tested …
    If it shows good on the gauge all is well
    If it shows lower and its loosing air
    There are basically 4 paths it will go.
    If you hear air coming out the throttle body, you have a bent intake valve or damaged valve seat
    If you hear air coming out the tail pipe, you have a bent exhaust valve or damaged valve seat
    If you heat air coming out of the oil fill spigot on the valve cover, you have blow-by of the piston rings into the crank case.
    If you see bubbles forming in the radiator with the cap off, you have a bad head gasket at best or a cracked head or engine block.
    If you hear air escaping from between the head and block ( soapy water will help pin point the area) your looking at the same issue(s) as the one above.

    #963916
    Nara Karu
    Nara Karu
    Participant

    Thanks Richard. Ill try it. Best regards

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