Join Date: Jul 2009
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Re: Pipe to hose to muffler
CCRiders, I am currently going through the exact same thing on a C-30 with an A4. I replaced the exhaust flange with a new one from Moyer, and it was 1 1/4" NPT. I then pieced together a 316 SS setup that, along with another fitting to attach the water feed, ends with a threaded 1 1/4" SS pipe. I then bought Shieldsflex II wet exhaust hose and ran it from the stern to the muffler location. The hose only comes in 12.5' rolls so it took two. I am going to connect the two in the middle with PVC pipe. (The water at this point is cool). So, my problem is the same, I have a 1 1/2" inlet/outlet on my waterlift muffler and a threaded pipe that is 1 1/2" but with an OD of 1 9/16...
Tomorrow, I am going to purchase 1' of 1 9/16 or 1 5/8 hose from west marine, coat the threads with 3M PN67 Scotch weld and double clamp them. (I have double reverse clamped all my exhaust lines. If you are still having this issue, let me know and I will tell you how it turns out. I don't see it as an issue if sealed properly. Apparently, on my boat, this was done a long time ago and only recently started to leak due to the cheap steel pipe they used corroding. If you come up with a better idea, let me know. AR
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