Mark:

I purchased a exhaust elbow/water mixing injector Yanmar PN 129671-13551, for my Yanmar 4JH3-TE (Amel SM2000 Hull # 335, delivered July 2001) from Boatswain's Locker in Costa Mesa CA phone 949-642-6800, for $251.00 US$ in 2007. It is a substantial cast part and although expensive doesn't seem out of line with other parts for this engine. Since my other hobby is aviation, this seem positively cheap compared to a similar part for an aircraft.

I purchased it as a spare and haven't had to use it yet. I am keeping my fingers crossed as the engine now has 1031 hrs on it. How many hours on your engines, and what symptoms did you see that indicated they are near the end of their lives.

Hope that helps a little.

Gary Silver s/v Liahona