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Old as Dirt!
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Thanks for the info Letrappes. But I can imagine how did you get access to both ends of the muffler. For me seems impossible!
In the port aft cabin, there is a smaller hatch door in the bulkhead between the cabin and the engine compartment situated beneath the base of the berth, which is removable. It is awkward but doable. One must be careful not to damage the wiring from the fuel level gage sender near the top edge of the fuel tank above the muffler.

FWIW I suspect that everyone that owns a mid-80's era First 42 has gone through the exhaust hose replacement exercise or, if not, will. Ours cracked right above the exhaust through-hull in the bustle while we were enroute to Key West from Tampa Bay a few years ago. Fortunately, I had a roll of "Rescue Tape" aboard and was able to make temporary repairs but we had to deal with quite a flood for awhile. A real (literal) pain in the neck! When replacing the exhaust hose, you need the most flexible hose you can obtain, regardless of cost. Trust me! BTDT!

FWIW...
 

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Discussion Starter #62
For the aft end of the muffler I had a friends ten year old son loosen the hose clamp and was able to remove it by pulling from the port lazarette. Putting it back on I had to sightly ream and lube the hose but got it back on and had the same kid put a new hose clamp back on. For the front side of the muffler I already had the heat exchanger off the engine so was able to get to it myself and put it back on. I ended up with a free end of spool piece of Parker brand wet exhaust rated hose. It was a pain to get in for sure but it's working fine now. This absolutely was not easy and I really don't ever want to do it again.
 

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It’s a good idea to have a kid to help changing the rear hose!

It seems that you both have the leak in the hose not in the body of the muffler. I just bought a little endoscopic camera to try to found where is located the leak.
 

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Hello, finally I’ve found that the front of the muffler is very corroded. After some intents I decided to open a big window under the port bed and take out the muffler. Now I send the muffler to repair and will change also the hoses.
 
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