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Old 05-14-2018, 05:47 PM
SoMD Terp SoMD Terp is offline
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Suspected Exhaust Leak

At the end of the 2016 season i noticed the cabin was filling with smoke while I was motoring to a marina to get bottom painted. I figured that it was due to the growth on the hull and prop adding load to the engine. When it was completed and I tweaked the idle setting, the smoke stopped. I didn’t use the boat much last year, but it smoked again by the end of the season and again this year. I had the bottom cleaned, but still smoke. After looking at the engine I determined that the smoke was coming from the exhaust tube from the engine to the muffler. The smoke is white and it lingers with a gas like smell. My thought is to replace the exhaust tube. I have attached a picture for reference.

Any troubleshooting thoughts? Also, where is the best place to buy the tube? Mine looks different than other options I have seen (1979 Catalina 30). Thanks!
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Old 05-14-2018, 08:09 PM
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Whippet Whippet is offline
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Dont think you will know source of leak until you remove the heat shield wrapping - (then re-post picture for us). Generally hot section can be rebuilt from standard plumbing black pipe
Etobicoke YC, C&C27
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Old 05-15-2018, 12:20 AM
Hawkeye54 Hawkeye54 is offline
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I agree with what Whippet says, SoMD, and a close look at the photo seems to indicate a loose / broken hose clamp and a possible crack just above the "Out" label that I see in the lower part of the picture. ( long distance troubleshooting )

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Old 05-15-2018, 11:03 AM
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I would also unwrap it and check the pipe. I have gone to work on mine and it collapsed from hand pressure. Rust Never Sleeps
Hint - drop some MMO in the carb. The engine will smoke - a lot! You can see where it leaks that way

Last edited by joe_db; 05-15-2018 at 03:59 PM.
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Old 05-17-2018, 08:37 PM
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sastanley sastanley is offline
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SoMD, Down here where we live it is always an adventure. I would suggest Dyson's or Ace Hardware. Most exhausts between the engine and muffler is 1-1/4" black iron pipe. It looks like you have a Moyer standard flange, which bolts to the manifold and has 1-1/4" NPT threads. As others suggested, remove the wrap and see. Moyer sells the wrap too, but you can also get it local at NAPA up next to the bowling alley.
"Twice Around" - '77 Catalina 30, #511 with original A-4 & MMI manifold.
OK! The engine is awake from her slumber. Now I need to get her detached from the slip!
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exhaust, smoke

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