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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
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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

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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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Old 05-24-2018, 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 05-25-2018, 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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Old 06-26-2018, 04:49 PM
SoMD Terp SoMD Terp is offline
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Exhaust leak located

Quote:
Originally Posted by joe_db View Post
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
Well, taking the best wrap off was the right call. I took it off and pipe just fell in half

Quote:
Originally Posted by sastanley View Post
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.
Any advice on how to get the new pipe made? Just take it in and have them help?
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Old 06-26-2018, 07:20 PM
Dave Neptune Dave Neptune is online now
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All of the fittings are just off the shelf plumbing. Be sure to use "black pipe" unless you just can't find it then use the galvanized.

Take a bit of time to design the fab. When I did mine the first time I changed a few lil directions and routed them in other places. This really opened up the area for other work and inspecting. Well worth the effort.

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Old 06-26-2018, 10:55 PM
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SoMD Terp, If you bring broken parts into Dyson's with a general idea of how they went together, they will do their best to help..they are one of the last 'old school' hardware stores in the area, but they do not know boats. They are always surprised when I come in and buy RV butyl tape for my boat, but they also have reasonable prices on West System Epoxy, so they sorta understand boats..just not old sail boats.

As Dave said, it is mostly 1-1/4" black iron pipe...the issue is that not every local store has every 45° or 90° elbow, a close nipple, 6" long pipe, etc., that you might need for your particular routing to mate up with the muffler.

You will need to do a bit of fabrication and design on your own...Just keep careful tabs on the parts you buy and don't tear them up so you can return this piece and that piece that is 1/2" too long or short as you rebuild your system, and you might need to trek to a couple other hardware stores to find the piece you need. (Ace or True Value).

I am in your immediate area (I work in Lexington Park)..send me a PM and we can talk if you need help. I have a day job and I am always busy, but I will happily make a run to meet you at the the hardware store at lunch, or at the boat after work, etc.
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Last edited by sastanley; 06-26-2018 at 11:26 PM.
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