DSuper5 compression test
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Thread: DSuper5 compression test

  1. #1
    Fellow Frogger! badabec's Avatar
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    Default DSuper5 compression test

    Hello, I'm working up to removing the engine to change the timing chain. I thought I'd do a compression test to see how healthy the engine is.

    The values were 160, 150, 165 and 150. All pounds per square inch. All done hot, all plugs out, gas pedal to the floor

    Are these reasonable?

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    Peter

  2. #2
    Fellow Frogger! Balki's Avatar
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    fantastic compression

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    1000+ Posts daffyduck's Avatar
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    Leave that one alone. What makes you think the chain is duffed?

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    mnm
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    Something I've been meaning to do for ages. What's the correct thread size and length for the compression tester?

    Thanks

    Matthew

  5. #5
    Fellow Frogger! Don B. Cilly's Avatar
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    I've been wanting to do it for a while myself, but I got stuck on a little problem:
    You are supposed to test the compression on a hot engine, but
    you are not supposed to remove the spark plugs on a hot engine.

    Does anyone know how to solve that one?

  6. #6
    Fellow Frogger! badabec's Avatar
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    Quote Originally Posted by daffyduck View Post
    Leave that one alone. What makes you think the chain is duffed?
    Hello, there is a tinkling sound at idle which disappears when the engine is revved. I've used my listening stick and there is no rattling from any of the ancillaries nor the valve gear. A few DS specialists have had a listen (including Adie Pease and Jamie from DSparts) and all have come to the conclusion it's the timing chain.

    Tinkling stops when the hydraulic pumps kicks in, then starts again when the pump cuts out. Maybe the extra load on the cam is tightening the chain and stopping the rattle.

    Still, all will be revealed as the monkey said (when he shit behind the door). It could just be a 'lost' 11mm socket rattling about somewhere.

    I'm going to avoid doing a Greenblood. It should just be engine out, clean everything up, change chain, clutch, handbrake pads, disc pads and slot it back in.

    Except that while I'm at it, all the glass is out so it can have 3M crystalline film applied. Now I need new runners for the glass and new door cards.....

    Peter
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  7. #7
    1000+ Posts Ken W's Avatar
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    Most compression testers come with adaptors for the two main standard sizes of spark plug so you should be able to buy and test straight out of the box.

    I have never heard about not taking a spark plug out of a hot engine except to be careful not to burn yourself ie handle the spark plug with pliers or gloved hand.

    Cheers, Ken W

  8. #8
    Fellow Frogger! Don B. Cilly's Avatar
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    Oh, I have read advice on not removing spark plugs out of aluminium heads unless they were allowed to cool for 24 hours.
    Which were obvious exaggerations, but to make a point that may be there.

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