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  1. #1
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    Base gasket burned away around exhaust outlets

    I knew this gasket was leaking... Oily residue under cowl, and visible exhaust coming from under the back of the powerhead. When I pulled the powerhead to re-build, this is what I found. Is this supposed to be happening? Did I use the wrong gaskets, or were they just poor quality? It's been 9 years since I mounted this powerhead. Do they normally burn away after awhile? It's been a long time... What's the correct part numbers for these base/pan gaskets?

    Wtf?

    '89 Hydrostream Vegas XT, '90 Merc 2.4 Bridgeport PCU EFI
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  2. #2
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    My motor man told me to tighten the powerhead bolts after ever race!!!! I have after20 years know how what he his talking about!!!! They will moveafter a short distance!!!

  3. #3
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    That is actually the wrong gasket. The base gasket for that pan is a metal reinforced gasket and has the same shape. Pro sell them and you will need 2 of them.

    Gasket http://parts.promarineusa.com/produc.../M50/1/1/2693A
    James Perry

  4. #4
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    My bridgeport does the same thing. The metal plate that mounts the cowl to the mid gets real hot at the exhaust and wont distribute heat like aluminum does. Better gaskets help.

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
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  5. #5
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    James is correct!!! The mercury Pt# is
    9 27-8231422 GASKET,EXHAUST PLATE 27-78069 2 $55.00 $50.88 2 <input type="text" size="4" name="8231422x10" style="font-size: 10px;">


    The one you have pictured Chad is nothing but standard Garlock gasket material and is not made to withstand the heat.

    Send me a PM or call me 757-544-1787 I have a couple hanging on my wall i'll send you.

    Bud Conner "Heathen" "Defending Our Constitution"

    FOR ALL ENGINE APPLICATIONS
    DRY Film Lubricant for Piston Skirts & Cranks + Thermal Barrier Ceramic Coatings for Piston Tops, Combustion Chambers, Valves etc !!



  6. #6
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    X3 on the better gaskets!!! Only ones to use when sitting under the power head! Another place I would not use those green ones is on the exhaust divider!.....

  7. #7
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    Ludington michigan,on the shore
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    Chad, is that a two piece plate? Looks like a gasket mismatch on the front side.Maybe just my old eyes.Those outlets look like the small ones.I think the BP PH is bigger.---Oh X4 on the metal gaskets.

  8. #8
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    Thanks guys!!!

    Those substandard gaskets lived for over 6 boating seasons before they finally burned through. I'm sure this was the reason my motor seemed a little down on power in recent years. It's been breathing its own farts.

    1990 Bridgeport
    1996 260 cowl and pan
    1989 2.4 200 adapter, mid, tuner
    '89 Hydrostream Vegas XT, '90 Merc 2.4 Bridgeport PCU EFI
    My YouTube videos________My Flickr photo gallery
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  9. #9
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    I also use the aviation gasket sealer on all of mine. Some say yes, use it, some say not needed. Instructor at merc school said will not hurt, and should make gaskets seal better over the long run. I'm not talking goober it on, just a thin coating on both sides of the gaskets. The metal cowl mount plate that is sandwiched in between is kinda prone to warping and allowing leaks. jm2cts

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

  10. #10
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    Quote Originally Posted by pyro View Post

    Those substandard gaskets lived for over 6 boating seasons before they finally burned through. I'm sure this was the reason my motor seemed a little down on power in recent years. It's been breathing its own farts.
    To think if you would have used the better gaskets the possibility of no power loss and better yet the poor thing would have never had to smell it self!!!.....

  11. #11
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    Expensive gaskets are good for 1 mph....

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

  12. #12
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    Click image for larger version. 

Name:	th.jpg 
Views:	18 
Size:	10.1 KB 
ID:	310084We use this on gaskets and bolt threads, Techs call it Monkey Sh!t in a can.

  13. #13
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    That's funny!

  14. #14
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    That omc monkey **** would cost 1 mph....

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

  15. #15
    Join Date
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    Quote Originally Posted by XstreamVking View Post
    That omc monkey **** would cost 1 mph....
    Nah its only like 8 bucks

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