[Public-List] More on move from Gray Marine gas to Yanmar

[Jim Davis]

The Yanmar is right hand, so rotation will be the same, but you will need more prop.  The stock prop for the Atomic 4 was 13x7 RH two blade, with an 2GM Yanmar I needed a 13x13 three blade.  To see what I did in the replacement   You will probably have to also replace the shaft due to length issues.  Use a stainless shaft.
http://www.alberg30.org/maintenance/MechanicalPropulsion/Diesel/YanmarInOlderBoats.html

Remember you want a diesel to run at about 3/4 of its rated RPM for normal cruise.


Jim Davis
S/V Isa Lei
CT 35

No man's life, liberty, or property are safe while the legislature is in session.

Mark Twain


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