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  1. #1
    Seaman
    Join Date
    May 2004
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    Muskegon, MI
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    54

    Default Exhaust Manifold Leaks

    Just bought a 1981 Mercruiser 260 I/O. It has developed a crack in the exhaust manifold. The previous owner did attempt to repair it with JB weld. I am in need of a replacement manifold and also for recomendations to a place to purchase.
    Ron Jon
    1981 Sea Ray Amberjack 25' Merc 260

  2. #2
    Seaman
    Join Date
    May 2004
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    Muskegon, MI
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    54

    Default Re: Exhaust Manifold Leaks

    One additional question...Is this a major job? It does not look very difficult...any tricks?
    Ron Jon
    1981 Sea Ray Amberjack 25' Merc 260

  3. #3
    Petty Officer 3rd Class
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    Apr 2004
    Location
    pontoon beach
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    85

    Default Re: Exhaust Manifold Leaks

    e-bay is a good choice boat junk yard, exhaust manifold are basically modified automobile exhaust manifolds, bolts a few nuts and gaskets easy repair.

  4. #4
    Rear Admiral Fishermark's Avatar
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    Oct 2003
    Location
    Pt Charlotte, Florida
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    4,603

    Default Re: Exhaust Manifold Leaks

    I personally would not recommend a used manifold, unless sure of its condition. I suppose those used in fresh water may be fine, but I boat exclusively in salt water and would RUN away from a used manifold! Do a search online and you can get some reasonable, (that's a relative term of course ), prices on new manifolds.

  5. #5
    Supreme Mariner
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    Mar 2004
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    On Barnegat Bay, NJ
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    17,582

    Default Re: Exhaust Manifold Leaks

    RonJon44, I agree with using a new manifold. In the freshwater of Michigan, they will last 20 years or so before rotting out. They are easy to find and purchase, although I have not found any great discount on price to be had. The marine manifolds are alot different than the automotive type, since they are water cooled. Use new marine gaskets on the block and riser. The removal/installation is equivalent to an automotive procedure, with the only danger is if the bolts are corroded into the block.

  6. #6
    Master Chief Petty Officer Blk-n-Blu's Avatar
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    May 2004
    Location
    Pocono Summit Pa.
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    819

    Default Re: Exhaust Manifold Leaks

    Ron, try ebasicpower.com for good pricing and no tax or shipping on most orders.

  7. #7
    Seaman
    Join Date
    May 2004
    Location
    Muskegon, MI
    Posts
    54

    Default Re: Exhaust Manifold Leaks

    I bought a new one I don't want any hassles with a used one. I am putting it in tonight and will update final results...thanks for the input ALL.
    Ron Jon
    1981 Sea Ray Amberjack 25' Merc 260

  8. #8
    Seaman
    Join Date
    May 2004
    Location
    Muskegon, MI
    Posts
    54

    Default Re: Exhaust Manifold Leaks

    I bought a new one from my local marina and the price is the same as I could find online. Plus I had the service department confirm most of your thoughts, NEW, not used and no sealant just TIGHT bolts. I don't want any hassles with a used one. I am putting it in tonight and will update final results...thanks for the input ALL.
    Ron Jon
    1981 Sea Ray Amberjack 25' Merc 260

  9. #9
    Seaman
    Join Date
    May 2004
    Location
    Muskegon, MI
    Posts
    54

    Default Re: Exhaust Manifold Leaks

    I installed the new manifold. I decided to take it to the bench and clean all the paint from the contact points. It was best done on the bench and not in the boat. One of the riser nuts was frozen up. The riser clamps on the rubber boot did drip little but put a good tightening and all is dry. Thanks for all the great input.
    Ron Jon
    1981 Sea Ray Amberjack 25' Merc 260

  10. #10
    Chief Petty Officer
    Join Date
    May 2004
    Location
    southern calif
    Posts
    459

    Default Re: Exhaust Manifold Leaks

    Ron, How was thermostat? I found that the marine 'stats are about 20 degrees (rating) cooler.

  11. #11
    Seaman
    Join Date
    May 2004
    Location
    Muskegon, MI
    Posts
    54

    Default Re: Exhaust Manifold Leaks

    The thermostat seemed fine, it ran slightly cooler until I had my timing and dwell adjusted. It seems to run in the middle of the temp green range now and actually runs better now.
    Ron Jon
    1981 Sea Ray Amberjack 25' Merc 260

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