Exhaust manifold

  • April 25, 2013 7:16 AM
    Message # 1278374
    Sorry if this is simplistic but I donot want to bother my mechanic, he is away getting a hip replacement and will worry that I am screwing up his engine. He removed the exchanger for repairs, the gaskets are still attached to block and are in very good shape, he stated they did not need replacement when exchanger removed. My question is do I apply gasket sealer goop to the heat exchanger before bolting on to engine. I never do mechanical or electrical, I like to leave it to those who know.
  • April 25, 2013 9:20 AM
    Reply # 1278452 on 1278374
    I have a Yanmar.  I have removed the cap to the heat exchanger, which has a rubberized ring gasket. Even though I had to replace this gasket because I mangled it once, if one is careful, one can usually use the same gasket if careful not to damage it.  I always rub such rubberized gaskets with Dow Corning Compound #4 silicone before I secure the part (=same experience with seal to impeller cover plate, same with valve cover atop engine, which was removed to adjust the valves...).

    Last modified: April 25, 2013 9:32 AM | Anonymous
  • July 01, 2013 3:54 PM
    Reply # 1331014 on 1278374
    Deleted user

    I do not know what kind of an exhaust system you have, but the general issue is the area that needs sealing: Is this a wet exhaust, or a dry exhaust. Then consider this: Does the area that is being sealed heat up or stay "room" temperature.

    I replaced the wet exhaust system from the manifold to the plastic muffler with ordinary plumbing parts in Hawaii and made the mistake of using Permatex gasket in a tube as a sealer. After motoring out of the AlaWai Marina thick smoke was coming out of the engine compartment. There was no fire, just the Permatex gasket stuff frying. I got seasick for half a day from the smoke, and I replaced the sealer with Teflon tape in the next port (Nawiliwili/Kauai).

  • July 01, 2013 6:12 PM
    Reply # 1331092 on 1278374
    Anonymous member (Administrator)

    James:  Do you have the make and model of the engine - that would help -- also if you email me images of the area that would be great -- I'll add to your forum posts...



  • July 02, 2013 10:17 AM
    Reply # 1331632 on 1278374
    If the gasket you are talking about is the one to the cylinder head, use nothing there.  temperatures are too hot there, and there is no water there.

    If you are talking about the endcaps that have water passages, any rtv will work, but hi temp would be best.

    Good luck.

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