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loose compression..

  • 01-07-2010 6:38pm
    #1
    CAVEMAN_69
    Registered Users, Registered Users 2 Posts: 916 ✭✭✭


    What are the causes for a piston to loose its compression? And what can be done to fix it? Thanks


Comments

  • #2
    Leftyflip
    Registered Users, Registered Users 2 Posts: 7,463 ✭✭✭Leftyflip


    It can be a number of things that causes a piston to lose it's seal and lose compression.

    • O-ring: if the piston is old or fairly used then the o-ring may be damaged or stretched, causing the seal to... go?
    • Lubrication: (heheheh, doorty) Ahem! If the o-ring is dry then it won't hold the seal as there is no oil to help hold it, this means that any small deviances in the seal won't be filled in letting air escape easily.
    • Fit: If the o-ring is new and well lubricated but the seal is still poor, then the chances are that it needs to be packed out a bit with some PTFE (Plumbers) tape.
    • Cylinder head seal: If the seal here is poor then you will lose air all around the edge of the head and cylinder, where they meet. Once again PTFE tape will generally fix it up grand.

    I'm sure I forgot something, if I did I'll stick it in later.


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