I think you've got it. The elbow either rusts through or gets plugged. The rust is hard to avoid but the plugging can be avoided by "blowing" out the coke. By running the engine as hard (> 80% load) and long as possible, as often as possible.
I have no idea when/if mine has ever been replaced by the PO. I remove mine and inspect it periodically (every 1-2 years) and I keep a spare. 4 bolts and some hose clamps, I can change it in 15 min while under way if needed. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Nov 13, 2014 7:24 AM, "John and Maryann Read via CnC-List" < cnc-list@cnc-list.com> wrote: > Our 34 has the original Yanmar 3GM which is working like a charm. How > does one tell if the mixing elbow is due for replacement??. Ours still has > the original mixing elbow which we removed and inspected about 12 years > ago. It was fine. Lots of water comes out the exhaust and engine > performance is fine. Engine is used mostly for motoring in and out of the > mooring field with periodic runs of an hour or so to get to the starting > line. I was thinking of removing the hose and use a mirror and spot light > to look inside?? > > > John and Maryann > Legacy III > 1982 C&C 34 > Noank, CT > > > --- > This email is free from viruses and malware because avast! Antivirus > protection is active. > http://www.avast.com > > > _______________________________________________ > This List is provided by the C&C Photo Album > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go bottom of > page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > >
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