Although rare, there is the possibility of a collapsed/delaminated exhaust hose. It is usually the result of running the engine with no water entering the muffler. The exhaust hose overheats and fails.
Not sure what else I can think of. -- Dennis C. Touche' 35-1 #83 Mandeville, LA On Sun, Jun 22, 2025 at 4:55 PM David Knecht via CnC-List < cnc-list@cnc-list.com> wrote: > Thanks Richard for the Nut Splitter suggestion. That is not a tool I have > ever heard of, but I intend to give it a try and see if it works. > > I am stuck again on this project and really need more of the excellent > input I have gotten previously. I got the exhaust riser off and was able > to order a new one. It arrived yesterday and I attempted to compare its > function to the old one. I can't convince myself that the old one is the > source of the problem. If I run water from the sink faucet into the input > port where the raw water would enter, water comes out the back (where it > would go to the muffler) in both the new and old exhaust riser. I can't > see an obvious difference in flow rate between the two. Is there a better > test or is this not meaningful? Obviously, I am going to install the new > one, but I am unconvinced it is going to fix the problem. The only thing > left in the system is the muffler. I have not heard of anyone replacing > this due to blockage. I thought that tended to occur at the exhaust riser > instead, but I have found online discussions of a blocked muffler > possibility. But most of the people I see replacing their mufflers are > stainless steel ones where they begin leaking. That is not my problem. I > checked all the hoses rearward of the muffler and all look good, so it > seems my problem is either the riser or the muffler. Are there any > diagnostics I should do or just go ahead and replace the muffler at the > same time as the rest is apart and pray. Thanks- Dave > > David Knecht > S/V Aries > 1990 C&C 34+ > New London, CT > > [image: pastedGraphic.tiff] > Your contributions help pay the fees associated with this list and help to > keep it active. Please help by making a small contribution using PayPal > at: https://www.paypal.com/paypalme/stumurray All contributions are > greatly appreciated.
Your contributions help pay the fees associated with this list and help to keep it active. Please help by making a small contribution using PayPal at: https://www.paypal.com/paypalme/stumurray All contributions are greatly appreciated.
