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post #2 of Old 08-23-2010
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Originally Posted by flyingfishUK View Post
We have a beneteau 40.7 with a Yanmar 3HJ4E engine. Since November last year we have had 3 sets of engine mounts fail with no obvious cause. We replace the mounts then about a month later they snap again! A local marine engineering company have removed the engine and gearbox, checked alignment then refitted. We have just had another set of mounts fail again! We have contacted Yanmar but they have never heard of this fault... emm

The engine runs perfectly in neutral, forward and reverse

The engine mounts are the standard set fitted to all engines of this type

Has anybody had this problem before?


I've heard about that problem a few times and the causes were found to be one or more of the following:

1- Shaft alignment issues
2- Shaft length issues (too long shafts)
3- Outside shaft support alignment/ sturdyness
3- Propeller balance



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