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  1. #1
    Gold Member Gold Member Dave M's Avatar
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    Merc/CMI service bulletin

    I ordered the parts to eliminate the bypass hoses on my 525 headers.

    Should I use some type of sealant or teflon tape on the fittings?

    Some of the connections are metal to metal and some are plastic to metal.

    Please keep this on strictly TECHNICAL level. The other issue has been beat to death.

  2. #2
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    Quote Originally Posted by Dave M View Post
    I ordered the parts to eliminate the bypass hoses on my 525 headers.

    Should I use some type of sealant or teflon tape on the fittings?

    Some of the connections are metal to metal and some are plastic to metal.

    Please keep this on strictly TECHNICAL level. The other issue has been beat to death.
    I used teflon tape. Might not need anything, pretty low pressure.

  3. #3
    Charter Member # 55 Charter Member Griff's Avatar
    My Boats:
    ............................... 32 Active Thunder
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    Teflon Tape or any type of pipe thread sealer.

  4. #4
    Gold Member Gold Member Dave M's Avatar
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    Thanks Guys! It looks to be a 15 minute job.

  5. #5
    Registered
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    22 Donzi Classic 525 EFI
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    Oct 2005
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    Where can we get the parts?

    Is this mod needed or is it just for installation of the new headers and tailpipes? The service bulletin does not say that all older set-ups should have this mod done. My headers have always stayed cool. When I stop the boat and check the engine room one thing I do is see if I can hold my hand on each header tube.

    And here is a link to where that bulletin was posted since I'm sure not everyone saw it.
    Merc. and/or CMI lawsuits?
    Last edited by thirdchildhood; 03-30-2011 at 08:29 AM.

  6. #6
    Banned
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    teflon tape or leak lock (awesome ch!t )

  7. #7
    Gold Member Gold Member Dave M's Avatar
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    Quote Originally Posted by thirdchildhood View Post
    Where can we get the parts?

    Is this mod needed or is it just for installation of the new headers and tailpipes? The service bulletin does not say that all older set-ups should have this mod done. My headers have always stayed cool. When I stop the boat and check the engine room one thing I do is see if I can hold my hand on each header tube.

    And here is a link to where that bulletin was posted since I'm sure not everyone saw it.
    Merc. and/or CMI lawsuits?
    I ordered my parts from BAM. http://www.bammarine.com/

    I don't know if it's a must have. I'm just trying (hoping) to lessen the possibility of having issues.

  8. #8
    Registered
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    Quote Originally Posted by Dave M View Post
    I ordered my parts from BAM. http://www.bammarine.com/

    I don't know if it's a must have. I'm just trying (hoping) to lessen the possibility of having issues.
    Thanks. I'm not sure if I'm going to do it yet. I've always liked the by-pass set-up as long as the proper restrictors are in place.

  9. #9
    Registered
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    Just for comparison this is the old set-up:

  10. #10
    VIP Member VIP Member
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    2005 353 Fastech w/525's
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    Quote Originally Posted by thirdchildhood View Post
    Thanks. I'm not sure if I'm going to do it yet. I've always liked the by-pass set-up as long as the proper restrictors are in place.
    The new 525's do not have the bypass and I called CMI and they said get rid of it. That's good enough for me.


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