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    1GM10 yanmar diesel

    I am looking for some advice for an 1986 O'Day 26 with a Yanmar 1GM10 (C) which I bought last Fall. The engine (2008) ran away ( not over 3500 rpm) and we think the block may well have a crack. After careful inspection wear limits etc. , we rebuilt the engine and it still ran away. 1. Is it...