12 Meter Exhaust Pipe Cracked

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tcollins2
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12 Meter Exhaust Pipe Cracked

Post by tcollins2 » Thu Oct 24, 2019 9:05 am

Muffler Pipe.png
Muffler Pipe.png (314.02 KiB) Viewed 1856 times
While I was winterizing I noticed water dripping from my port exhaust joint where the 8-inch rubber pipe joins to the molded fiberglass pipe just before it exits the boat. The layout is exhaust manifold to the muffler to the 8-inch hose to the fiberglass exhaust pipe. With the motor off, the drip is slow, most likely salt water sloshing around because that joint is more or less at the waterline. When it's running it speeds up due to more water flow coming from the engine. Pipe looks fine Shields 8-inch series 200 no wire. I tightened the hose clamps. No difference. Now that I'm on land, I performed a "colonoscopy" and put my phone on a stick and sent it up the port exhaust. What I found was two cracks. One actually looks more like a saw blade cut. I'm sure taking that hose off is going to be a PITA. But once it's off, what is the fix? I can't add fiberglass to the outside of the pipe because I'll never get the hose back on. Just adding fiberglass to the inside seems like it would be weak. Suggestions?
1990 Trojan 12M International Express Detroit Diesels 6-71T's, 425HP

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prowlersfish
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Re: 12 Meter Exhaust Pipe Cracked

Post by prowlersfish » Fri Oct 25, 2019 6:51 am

Do you have transom or side exhaust ? Is the pipe glassed to the hull ?If not I would replace the pipe photos from a distance would help .
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tcollins2
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Re: 12 Meter Exhaust Pipe Cracked

Post by tcollins2 » Fri Oct 25, 2019 8:51 am

Yes, pipe is glassed into the hull. Changing the entire pipe is not an option. The pipe extends inside the boat. One thought is to cut away the broken part and then buy a longer 8-inch hose.
1990 Trojan 12M International Express Detroit Diesels 6-71T's, 425HP

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prowlersfish
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Re: 12 Meter Exhaust Pipe Cracked

Post by prowlersfish » Fri Oct 25, 2019 6:09 pm

You could cut it if its long enough . But I would look in to repairing it .
TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat :D
2009 TROJAN RENDEZVOUS
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mikeandanne
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Re: 12 Meter Exhaust Pipe Cracked

Post by mikeandanne » Sat Oct 26, 2019 2:05 pm

Can the cracks be covered if you slip a new hose on further ? If so just drill a small hole at the end of the cracks to stop them cracking further clean and fill with epoxy and then put the hose on to cover the repaired area.Just an idea.
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tcollins2
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Re: 12 Meter Exhaust Pipe Cracked

Post by tcollins2 » Sat Oct 26, 2019 11:10 pm

Here is another pic. It's leaking under the blue rag.
Trojan Exhaust1.jpg
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1990 Trojan 12M International Express Detroit Diesels 6-71T's, 425HP

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Re: 12 Meter Exhaust Pipe Cracked

Post by RWS » Sun Oct 27, 2019 4:18 am

mikeandanne wrote:
Sat Oct 26, 2019 2:05 pm
Can the cracks be covered if you slip a new hose on further ? If so just drill a small hole at the end of the cracks to stop them cracking further clean and fill with epoxy and then put the hose on to cover the repaired area.Just an idea.
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Re: 12 Meter Exhaust Pipe Cracked

Post by WayWeGo » Wed Oct 30, 2019 3:54 pm

Hopefully you don't have something like this going on. This hose was on the head waste line and the cut went past the hose clamp so waste was leaking into the bilge. I guess the hose was too hard to get on the fitting so they slit it to make it easier to install!
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tcollins2
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Re: 12 Meter Exhaust Pipe Cracked

Post by tcollins2 » Thu Oct 31, 2019 9:07 am

That's nuts! Especially with a waste line. Loosened the clamps on the 8-inch and of course neither side will budge. Tried putting a putty knife in from one end to loosen up the seal. No luck. Will try some heat next. If that fails we have two options 1) cut the hose in half and we should be able to get one side off then buy a fiberglass male-male coupling to go where we cut the hose, or 2) buy a new hose. I was partial to the blue silicone hose that has the same SAE 2006 R1 rating. That stuff is so flexible and easy to install but $$$$.
1990 Trojan 12M International Express Detroit Diesels 6-71T's, 425HP

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Re: 12 Meter Exhaust Pipe Cracked

Post by prowlersfish » Thu Oct 31, 2019 6:41 pm

New hose will be easier to work with black or blue , just stay away from the stuff with wire .
TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat :D
2009 TROJAN RENDEZVOUS
Port Kinsale 2010 & 2011. Solomons get together 2011.

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Re: 12 Meter Exhaust Pipe Cracked

Post by P-Dogg » Fri Nov 01, 2019 9:48 am

WayWeGo wrote:
Wed Oct 30, 2019 3:54 pm
Hopefully you don't have something like this going on. This hose was on the head waste line and the cut went past the hose clamp so waste was leaking into the bilge. I guess the hose was too hard to get on the fitting so they slit it to make it easier to install!
20150831_143032.jpg
This is one reason why I like to do all of my own work. Thankfully, I haven't found such poor crapsmanship on anything I have replaced, which has been a lot. Am rebedding my hull to deck joint at the moment...
I needed a less expensive hobby, so I bought a boat!

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