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Thread: My Compression Test Results: Thoughts?

  1. 7th July 2013, 05:34 PM #1
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    My Compression Test Results: Thoughts?

    Hi - dry tested and normal temp my Series 3 with 2.25 petrol (8:1).

    The results are in from 1-4: 130, 130, 105, 128.

    So cylinder 3 is a way out - head gasket? Have been trying to solve a problem where the truck dies in 3rd/4th gear and difficult to restart.
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  2. 7th July 2013, 06:35 PM #2
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    djam1
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    Could be as simple as a tight valve have you done your tappets lately??
    Adjust your tappets and give it a flog up the road
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  3. 7th July 2013, 06:41 PM #3
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    Righto will have a look at those.
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  4. 7th July 2013, 07:30 PM #4
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    will d8r
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    Also a thought may bit of carbon under a valve, if it is head gasket 2 & 3 would be the same.I had the same issues and was told to try a bit of brake fluid down the carby.I ended up taking the head of and rebuilt it.I was also advised to put the deisel head gasket on as they last a lot longer time will tell I guess.
    Cheers Will
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  5. 7th July 2013, 07:42 PM #5
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    Yep. Going to check valve clearances. The engine breather has so much steam it comes into the cab so may still be something going on there.
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  6. 7th July 2013, 07:44 PM #6
    chazza
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    If you do a wet-test you can see if any of the pressures come up; if no 3 stays the same it may well be that the valves are the problem,

    Cheers Charlie
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  7. 7th July 2013, 08:02 PM #7
    romhopper Guest
    do a bleed down test if is inlet valves air will come out the curb, if is the exhaust valves out the exhaust, out the sump bleeder rings,
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  8. 7th July 2013, 08:20 PM #8
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    A wet test might help differentiate rings vs valve issue on C3...?

    But havent I now ruled out the inlet/exhaust on the manifold as only 1 cylinder that is down?
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