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O Rings intake manifold

in General Tech Discussion 8 years ago
I removed #3 head for work. The 2 o rings on the intake manifold to head look ok. Is it necessary to replace them?

Pete Christensen

  • Re: O Rings intake manifold

    by » 8 years ago

    Many will tell you to always replace them. Most don't and they seem to work okay. If it's an older engine replace them and if it is fairly new then you may be just fine. Your decision. Rub a thin film of white lithium grease on them new or old. NO silicone.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: O Rings intake manifold

    by » 8 years ago

    Roger -- Why NO SILICONE? Does it negatively react with these O-rings? -- David
      
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  • Re: O Rings intake manifold

    by » 8 years ago

    Hi David,

    Because silicone will not mix and not compatible with fuel or oil. It can clog things, cause misfires and in enough quantity stop the engine.

    White lithium grease is compatible with fuel and oil and when hot goes back to an oily state and can if necessary pass right through without any issues. Use this grease to lube your "O" rings

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
    Report

  • Re: O Rings intake manifold

    by » 8 years ago

    Thanks Roger. I was referring to and should have said "silicone spray". I was not referring to "silicone sealant". I totally agree that "silicone sealant" is highly inappropriate in such applications. White lithium grease sounds good.
      
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  • Re: O Rings intake manifold

    by » 8 years ago

    Hi David,

    Don't even use silicone spray The white lithium grease is a good safe way yo go. I even rub my carb bowl gaskets down with it on the top, bottom and into the edges really good. Never had a leak. I never glob any of the grease on anything just rub it in.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

    Thank you said by: David HEAL
      
    Report
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