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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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exhaust

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
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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 )





Rick
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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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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.
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"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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