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  1. #1
    Join Date
    Sep 2008
    Location
    New York, NY, USA
    Posts
    71

    Default "On my starboard engine, I not

    "On my starboard engine, I noticed a drip of hot water leaking out of the center exhaust port that leads into the log manifold. When hot enough, it steams. When I feel underneathe, there's a hole there with threads and it seems there is a bolt missing.

    I say this because on the opposite motor, there is a bolt in that spot....and no drip.

    Question is, why is there just a small drip coming from this area. Would it be gushing water when running a while?

    Guess I can find a bolt and plug it up.}





    the same spot where I suppose a bolt should be. If this bolt is totally missing, why is it only dripping slightly even after running a while? It is salt water because when it drips and steamed, there is salt residue when the h20 burns off.



    on my port engine, there is a bolt that screws into the underside of the center exhaust "port" of the manifold. I found this because"

  2. #2
    Join Date
    Oct 2007
    Location
    Gilford, NH, USA
    Posts
    22

    Default "I would guess that your manif

    "I would guess that your manifold is clogged up with scaley rust chunks etc. that will typically accumulate in the area where this plug should be. Might be a good time to get a gasket set and remove those manifolds and get them cleaned. Also, the reason the plug is missing - the threads on my manifolds strip easily and won't hold the plug. You may have to re-tap - 1/8" NPT I think."

  3. #3
    Join Date
    Sep 2008
    Location
    New York, NY, USA
    Posts
    71

    Default the threads seem to be intact.

    the threads seem to be intact...as far as I can feel. Is the standard thread here 1/8" for sure?

  4. #4
    Join Date
    Sep 2008
    Location
    New York, NY, USA
    Posts
    71

    Default "actually, there's no way

    "actually, there's no way this bolt/plug is only 1/8. It's gotta be 5/16 or 3/8.

    Anyone know for sure?"

  5. #5
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    15,190

    Default I've seen that before. Yo

    I've seen that before. You might have to pull the thing off to plug it.

    Long as there's good metal there you should be okay.

    Jeff

  6. #6
    Join Date
    Sep 2008
    Location
    New York, NY, USA
    Posts
    71

    Default pull it off? the threads are

    pull it off? the threads are there and seems to just need a bolt screwed into it.

    or are you saying to pull it off if the threads are bad?

  7. #7
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    15,190

    Default "If the threads are good, sure

    "If the threads are good, sure--thread a bolt or a pipe plug (more likely) into it. if not, you might try tapping it--anything is better than ripping it off! But be sure there's enough metal left. I've seen them rot out in that area.

    Jeff

    PS: That's apparently some kind of low point drain. Not sure why they are put there since the plugs are impossible to remove after a while (unless that fall out)."

  8. #8
    Join Date
    Jan 2008
    Location
    Pittsburgh (Three Rivers Area), PA,
    Posts
    11

    Default "I am in the process of redoin

    "I am in the process of redoing my 318 with the log exhaust....I checked mine, and they are 1/8 national pipe thread....not SAE (society of auto engineers) thread...."

  9. #9
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    15,190

    Default Thought so. Why they put them

    Thought so. Why they put them there....

    Jeff

  10. #10
    Join Date
    Jan 2009
    Location
    , MI, USA
    Posts
    215

    Default "Jeff, I bet the holes were le

    "Jeff, I bet the holes were left in the manifold casting as a result of a support for the sand core.
    . On my log exhausts (318 / 195 hp, Raw water cooled), the small 1/8 inch pipe plugs in the center of the manifolds eventually blew / rotted out (18 - 25 years). And it was an exhaust leak! Just like, as if there was a 1/4 inch hole in the manifolds, (and it has only been the center ones).
    I found the plugs in the bilge in fair shape, but had to re tap the hole with a 1/8 pipe tap.

    The first couple of years that I winterized her, I did pull the 1/8 inch plugs (just to be sure) but never got any thing out of them.

    Now, just above them, in the centers (a little more to the outside of the engine) are some standard 1/4 inch pipe plugs that are into the water jacket of the exhaust manifolds.
    I pull them as part of the winterization process.

    Crappy camera phone pictures
    PORT
    Port"">

    STRB.
    Strb."">

    Fred 156-M

    (Only 37 days till Augusta, MI.)
    http://www.michiganhydroplane.com/Members.html"

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