Muffler Hose Conundrum

[jneely]

I was forced to replace the muffler for the Yanmar SB8 engine on our CD 27. I am using e fiberglass Vernalift type muffler as the replacement. However, I have run into a problem. The inlet for the muffler is sized for 1 5/8 inch hose but the hose fitting coming out of the exhaust riser is sized for a 1 1/2 inch hose. A mechanic friend of mine has suggested using radiator hose which comes with different sizes at the ends. The riser and muffler are very close so only about two inches of hose will be exposed from clamp to clamp. Does anyone think that this would present a problem? If so, is there any way to make a 1 5/8 inch hose fit on a 1 1/2 inch hose barb?

[Frenchy]

I can't think of any easy answers to your conundrum, but one thing's for sure: don't use radiator hose. It's not
designed for muffler hose duty. If you know of any small machine shops in the Riverhead area, you could ask for a
short stainless tube with a 1-1/2" I.D. and a 1-5/8" O.D. and then slip that over your fitting. It would be best to bring
that fitting to the shop so they could match the I.D. close enough to make it a close push fit. A hose clamp should
compress the ring enough to make a good seal.
This might not be the easiest solution- hopefully someone else will come up with a better one. This kind of problem
has happened to me when connecting metric diameters on my Kubota-based motor and inch diameters on say
heat exchangers. Good luck - Jean (former resident of Jamesport)

[Frenchy]

Another idea would be to wrap the 1-1/2" fitting with 1/16" rubber sheet available here:
http://www.lowes.com/pd/Plumb-Pak-6-in- ... her/108295
You could cut the length according to C=3.14 x 1.5= 4.712
Possibly stick it on with spray adhesive and lubricate the outside so the 1-5/8" hose will slip on.
One other thought- take an old bicycle tube, cut out a section crosswise and stretch it over the 1-1/2" dia.
-Jean

[bottomscraper]

I would think using 1 5/8 hose and a few wraps of that silicone "X-Treme Tape" or "Rescue-Tape" on the smaller fitting would be fine. The tape is rated for about 400F, wet exhaust hose is only typically rated for 250F. I would not use radiator hose. I like the idea of a stainless tube but the walls would only be 1/16" thick, not an easy task.

[jneely]

Thanks for the great suggestions, folks. My mechanic was able to muscle the 1 1/2 inch hose onto the muffler. End of problem.