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  #21  
Old 08-27-2013
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Re: Replacing engine mounts

Quote:
Originally Posted by Brent Swain View Post
A Canadian yacht had to be abandoned and the skipper rescued off the Great Barrier reef last year, when his Yanmar mounts all broke, and his loose engine bashed a hole in his hull. I have heard other stories about Yanmars breaking loose from all their mounts simultaneously, leaving the engine rolling dangerously in the bilge. They have nothing but rubber holding your engine in. You would be wiser to go for Perko mounts, which are not dependent on rubber alone for holding your engine in. If you have new Yanmar mounts, a bit of chain to stop your engine from breaking loose completely would be a good safety factor.
I agree that Yanmar mounts have no captive design against lateral (rolling) or uplift (capsize) forces. Fortunately the design does allow a quick and simple captive securing, i.e. with a chain.
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  #22  
Old 08-27-2013
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Re: Replacing engine mounts

I found this on Yanmarhelp.com at ENGINE MOUNTS in regards to safety wiring the mounts for offshore use.
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Pacific Seacraft 34
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  #23  
Old 08-28-2013
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Re: Replacing engine mounts

I have had one mount fail under my 3HM35F Yanmar (front port). It was not the rubber to metal bond that failed, but rather the engine mounting bolt which cracked through just above the point where it joined the upper metal plate. It made a ticking noise when the engine idled. The surveyor heard it before we bought the boat, but he could not locate the source. We found it 6 months later. I replaced all four. Later when we had the engine rebuilt, I replaced all four mounts again with no indication that anything was wrong with the existing mounts.

Bill Murdoch
1988 PSC 34
Irish Eyes
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  #24  
Old 09-03-2013
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Re: Replacing engine mounts

Bill, I had the same mounting bolt break at the same point. I have an engine driven refrigeration compressor on a bracket that attaches to that motor mount. Do you also?
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  #25  
Old 09-04-2013
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Re: Replacing engine mounts

The forward port engine mount was broken when we bought Irish Eyes. At that time the engine drive refrigeration compressor was missing. (The hoses and clutch wire had been cut and hidden.) The compressor had previously been installed on the starboard side of the engine about even with the 3HM35F injection pump on brackets attached to the injection pump bolts. In that location it rubbed on the fuel fill line and blocked access to the dip stick, the small engine fuel filter, and the priming lever on the engine fuel pump. When I reinstalled the compressor a year or so later, I made a new bracket and mounted the compressor above the engine and to port just above the spot where the Yanmar factory alternator mounting bolt goes.

Bill Murdoch
1988 PSC 34
Irish Eyes
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  #26  
Old 09-04-2013
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Re: Replacing engine mounts

My compressor is also on the port side. the bracket is really strong, but is mounted to everything. Two of the water pump bolts, one head bolt, the forward port motor mount and two bolts into what appears to be the where the original rear motor mounts were on the engine.
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