Yanmar Engine Info

Warren Elliott
November, 2005

Hull #: 44

At the August east coast Catalina Rendezvous, Richard Mastry of Mastry Engine Center spoke on related topics. Mastry is the Yanmar engine supplier to Catalina for our later C380s, C387s and C390s. I spoke with him after his talk. and again, at some length, on the phone a few weeks later. I concentrated my queries on props and RPM’s, as our Sailnet list discussions have been pretty heavy on this subject. Here’s his comments.

New Engine

First, Mr. Mastry spoke about the new Yanmar 3JH4xx engine, delivered for C387’s beginning about hull # 60. The major changes include larger diameter cylinders, lower working RPMs and some user-friendly upgrades including rearranging the salt water pump for ease of impeller and/or pump change. The transmission reduction gear has also been changed to 2.33 ratio, so that the shaft RPM’s will be closer to that of

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