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  1. #1
    Platinum Member Platinum Member ApachePete's Avatar
    Join Date
    Aug 2001
    Sarasota,FL & Saugatuck, MI

    Leaking Header: Why?

    I have water leaks into 2 cylinders at the flange on one CMI header (500 efi).

    It started after the headers were r&r.

    Could the leaks be the result if improper installation of the headers: the leaking header also had at least 2 loose bolts.


  2. #2
    Charter Member #1093 Charter Member SteveDavid's Avatar
    My Boats:
    2003 60' SeaRay, 2014 30' Concept CC
    Join Date
    Feb 2001
    Lighthouse Point & Ocean Reef FL

    When you say R&R, where they rebuilt, new sleeves, etc? I replaced mine after about 2 1/2 years and 250 hours as they were pretty much swiss cheese near where the tail pipes attach. CMI and Jeff were very fair regarding their warranty. It appears that regardless of how regularly you flush your engine with fresh water (assuming some of your boating is in salt water) the headers will deteriorate quickly if you have a shore power cord plugged in for any length of time (meaning a few days while the boat is in the water). Apparently the headers, with salt water inside, and the shore power create a current that literally eats up the headers. It's a galvanic corrosion as opposed to salt water corrosion. Chasing after the leaks is near impossible.
    Using Salt Rid or comparable when flushing your engines seems to slow the deterioration significantly.

    Good luck!

  3. #3
    Registered lucy's Avatar
    My Boats:
    41 apache
    Join Date
    Feb 2003
    Miami, FL
    we use stellings on 800sc merc.
    no 2 sets,I call it insurance.

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