The output of the exhaust elbow on my 1978 YSB12 is threaded on the inside to
fit 1 1/4 inch iron pipe, and appears to have been done that way as part of the
original installation. The engine installer must have threaded the elbow, since
I never heard of them coming that way from Yanmar, but I don't know that for
certain. The threads mate with a short nipple, followed by a 90 degree elbow,
and then a copper pipe thread to soldered copper pipe adapter fitting instead
of a hose barb. This is followed by a foot or less of hose that goes straight
to an aluminum can style water lift muffler. All of the above was closely
wrapped in asbestos header tape and secured with monel seizing wire spaces
about 3/8 of an inch. It would have been a very sharp bend in the hose without
these extra fittings.
I would never have known what was under the asbestos wrap except that the 90
degree elbow eventually rotted through at the bottom where a little puddle of
water sat when the engine was shut off. I really can't complain about the
design since it took over 30 years to fail, but that copper part still seems
odd.
Anyway, if you have or have access to a 1 1/4 inch pipe thread tap, you could
tap the inside of the outlet pipe and install a conventional galvanized or
bronze hose barb. The stock elbow for your engine should be the same as mine,
without the internal threads.
Steve Thomas
CC27 MKIII
Date: Tue, 27 May 2014 14:49:56 -0500
To: cnc-list@cnc-list.com
Subject: Stus-List need adapter to connect mixing elbow 1.5 OD to muffler
1.25 OD
From: cnc-list@cnc-list.com
Finishing reinstalling my Yanmar 2QM15 in my 30-1, I need to connect the
official Yanmar mixing elbow (OD 1.5) to the orig equipment metal muffler tube
(OD 1.25). Anyone have a handy source for a suitable adapter? I have high temp
radiator style hoses in both ID sizes.
The P.O had a bizarre collection of hardware store galvanized pipe connecting a
homemade elbow to the muffler. The pipes always leaked a little. I'm trying to
get back to something resembling the original setup.
Thanks
NateSarah Jean1980 30-1SIskiwit Bay MarinaLake Superior
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