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Old 04-24-2015, 01:11 PM   #11
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There are kits but they are manifolds and elbows only.

I would also replace the flappers while you have it apart.
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Old 04-24-2015, 06:15 PM   #12
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That's the kit I was referring to. So, as I attack this, I was just reading a warning when removing the manifolds. It indicated that many people, including mechanics, leave exhaust ports unplugged when removing he manifolds, leading to the sinking of the boat. First off, what are the exhaust ports? And how are they unplugged during the removal?
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Old 04-24-2015, 09:30 PM   #13
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First this only would apply if the boat is in the water while performing this task.

They are referring to the y-pipe passages being left open, if the top of the pipe is below the water line water will flood the boat.
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Old 04-25-2015, 02:35 AM   #14
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I mentioned pulling the elbows and finding significant rusting and obstruction. Will also be replacing manifolds, basically entire exhaust components. My question is, will mostly a very inquisitive wife, is there any engine damage or corrosion issues given the state of the elbows and assuming the manifolds?

Engine starts and runs smoothly, especially with rebuilt carburetor, good compression, I am assuming. Never a hydrolock that I understand means water in cylinders. Good oil pressure and temperature. It's there anything that I would notice symptomatically or objectively to rule engine damage?
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Old 04-25-2015, 04:39 AM   #15
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Water in the oil or a tuliped exhaust valve (melted seat) are the common signs of water ingestion from leaky exhaust.

Sounds like you caught it in time.
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Old 04-25-2015, 04:50 AM   #16
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Didn't see any water in oil. What would signs be will tuliped valve failure?
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Old 04-25-2015, 04:55 AM   #17
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Quote:
Originally Posted by lifespan View Post
Didn't see any water in oil. What would signs be will tuliped valve failure?
Bad compression. On a boat I boat it was zero psi as the valve did not seal at all.

Burning water raises exhaust temps so the exhaust valve or seat fails.
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Old 04-25-2015, 06:07 PM   #18
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Here are the manifolds I just ordered from go2marine.com. Thought this might help you.



As far as plugging the exhaust ports. Once I removed the riser from the rubber tube, I plugged the rubber tube with these test plugs from home depot. See pics.
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Old 04-29-2015, 03:47 AM   #19
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Ordered new manifolds, risers and elbows. When reinstalling manifolds, what is the best way to make sure that manifold gasket remains positioned correctly as I connect manifold? Should I use a spray adhesive to secure? If so, what can be used? The same question for the gaskets between riser and manifolds and elbows and risers.

Lastly, best way to clean gasket surface between engine and manifold?
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Old 04-29-2015, 04:04 AM   #20
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For removing the old gasket use a gasket scraper that you can get from an auto store. I then clean it up with fine sandpaper. Stick a shop towel in the exhaust ports to keep debrie out.

You can get gasket adhesive to attach the gaskets to the manifolds or use a piece of all-thread in the end holes to get started, then install the center bolts. Now remove all-thread and install bolts.

Riser and elbow gaskets should just drop in place.
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