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  #1   IP: 174.204.43.61
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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OK! The engine is awake from her slumber. Now I need to get her detached from the slip!

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Old Yesterday, 10:07 PM
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Unhappy similar thing going on- exhaust leak

Yep it sounds like my hot exhaust pipe is going the same way as Terps. I noticed exhaust smell in the cabin last time I motored and today I noticed a different sound in the lazerette where the exhaust piping is. Like a tiny hole in an exhaust pipe. Sounds a little like a rattling diesel! And smelly cabin again.

You'd thing these things would last longer than 40 years! hahaha.

My trepidation stems from knowing there are bronze age rusted bolts and pipes down there, etc. and what? having to hang upside down to get to it? Pull the engine? Cut a hole in the hull?

Any words of encouragement are appreciated.
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Old Today, 06:25 AM
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Bill,

I cut mine apart with a hack saw in a couple of strategic places to get it out - based on reading this forum. Took maybe five minutes to get it out.

KEEP THE PIECES and take them to the plumbing supply store with you to get the black iron pipe - not galvanized as it has a zinc coating which will produce toxic fumes when heated.

Consider adding a union(s) in the new section to make installation easier.

Do not buy cheap exhaust wrap on ebay - I did this and it produced a horrible smell that simply did not diminish with time so I replaced that too.

Hope that helps,

Peter
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  #8   IP: 155.186.126.158
Old Today, 09:32 AM
Dave Neptune Dave Neptune is offline
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Bill, removal can be a bit rough so use a saws all and remove in chunks. It is quite easy to cobble a new one once the old one is removed.
Look at the space real good there may be a far better routing path.
You have control of where the "hi spot is" and where the water is "injected" into the exhaust.
I rerouted mine in my ole E-35 so I could mount a bypass oil filter in the box, really came out nice and far better than the factory set up.

Dave Neptune
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Old Today, 09:51 AM
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Thanks guys. I need all the encouragement I can get. hmmmm I like "saws all."

I am sooo lazy I don't want to do anything- just sail. Or even patch it with some hi temp stuff to give me more time.

I guess first thing is to remove the wrap and see what I've got. Maybe I can stick my phone down there and get some pics.
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Old Today, 10:40 AM
Dave Neptune Dave Neptune is offline
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Bill, an exhaust leak into the cabin is not something to put off. The ramifications of CO poisoning are just to great!

When you remove the wrap you will most likely uncover the leak and make it much worse.

Dave Neptune
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