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Knock Sensor Install - Teflon Tape?

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  • Knock Sensor Install - Teflon Tape?

    Quick question about the installation of a new knock sensor. Would it be good practice to wrap a bit of teflon tape on the threads before screwing the knock sensor in?
    1987 Alpha 1 - 2008 efi 5.7 L S/B.
    ON the oppostie side of the engine there is s small brass plug to install. It has tape on it. Wondering if the same for Knock sensor?
    Thanks Roman

  • #2
    Re: Knock Sensor Install - Teflon Tape?

    Would it be good practice to wrap a bit of teflon tape on the threads before screwing the knock sensor in?
    It would not be a good practice to use teflon tape on any system in a boat. There are better products. Standard pipe dope with teflon in it is 10000% better than teflon tape.
    TT wil also insulate the ground to sensors of any kind.
    Don S.


    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

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    • #3
      Re: Knock Sensor Install - Teflon Tape?

      No. There should already be some kind of junk in the threads... usually orange. That's it.
      2000 Chris Craft 240 Bowrider
      5.7L Volvo Penta GSi

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      • #4
        Re: Knock Sensor Install - Teflon Tape?

        Originally posted by BLinindoll View Post
        No. There should already be some kind of junk in the threads... usually orange. That's it.
        That is ONLY if it is a genuine OEM Mercruiser part. Aftermarket manufactures miss that step, along with a few other obvious differences in some parts. How else can they make them cheaper.
        Don S.


        Please, no PM's (Private Messages) regarding boat/engine problems.
        That is what the forums are for.
        Only forum/moderator issues will be answered in PM's.

        Comment


        • #5
          Re: Knock Sensor Install - Teflon Tape?

          Originally posted by Don S View Post
          How else can they make them cheaper.
          EDIT:
          NOT
          Last edited by Don S; October 7th, 2008, 06:00 PM. Reason: Not going there
          2000 Chris Craft 240 Bowrider
          5.7L Volvo Penta GSi

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          • #6
            Re: Knock Sensor Install - Teflon Tape?

            A knock sensor just screws into the block to detect engine knock, pre ignition. There should be no need for any thread sealant, besides it needs a good ground.
            1978 17' Arrow Glass Cheetah
            Mercruiser 165 hp inline 6
            Mercruiser 888 drive
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            • #7
              Re: Knock Sensor Install - Teflon Tape?

              I seem to remember the service manual indicating specifically to NOT use teflon (or thread sealant) tape on the knock sensor. There's really no reason anyway. You're not sealing anything anyway.

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              • #8
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                Re: Knock Sensor Install - Teflon Tape?

                Nothing on the threads.

                Was not even going to post when i saw Ht post, cause he got it right, always does.

                No anti-seize ether.

                Resist the urge to coat every thread with something.
                " The Chief Has spokin "

                1986 Citation 19' 140 merc motor transplanted Sept. 2008. Stringer drive.
                1976 Arrowglass couger, 76 Evindrude 70 hp.
                1970 Aluminum jon boat 3 hp air cooled sears out board

                Be good, be happy, treat people as you would want them to treat you, for tomorrow is promised to no man.

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