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post #11 of 17 Old 03-10-2009
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Originally Posted by r.furborough View Post
I would suggest using the original Yanmar mounts, if however you require an aftermarket mount, R&D make a range of mounts, including mounts for Yanmars with Yanmar spec'd mounting holes. In the USa they are available through PYI Inc. Max-Prop PSS Shaft Seal Seaview Radar Mounts R&D
When we bought our boat last year, it had a brand-new 3YM30 mounted on PYI mounts. One of the mounts had failed. The engine had 4 hours on it, and I believe it had never left the dock, so vibration was not the cause. As for time - the boat had been sitting for less than a year.

The problem is, Yanmar mounts are very tall. If you have a clearance problem, it's awfully tempting to use aftermarket mounts instead of rebuilding the beds.

Is it possible that Poly Flex or some other company might use more sophisticated materials to get the same results (the perfect blend of soft and stiff) that Yanmar mounts get with height?

s/v Flutterby, Freedom 33

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post #12 of 17 Old 03-11-2009
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This mount design will keep the motor where it belongs when the sh!t hits the fan.

Anything else is ---

Last post on this subject.

Rick
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post #13 of 17 Old 03-12-2009
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Does that mean your last post on this subject, or you want the rest of us to cease and desist, too? I'd say the topic of engine mounts is always open to discussion, at least until I figure out why mine failed without actually being used.

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post #14 of 17 Old 03-13-2009
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Naw

Just my last post on a better motor mount.

What failed on your motor mount and do you have it?

It could be that it is the the first one tightened and then the motor was twisted or moved fore and aft or side to side. This would induce a tearing motion even with out the motor running. If you still have it, try putting the pieces together (the rubber will kinna interlock) to see what it looked like before it failed, it will give you a clue.





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Does that mean your last post on this subject, or you want the rest of us to cease and desist, too? I'd say the topic of engine mounts is always open to discussion, at least until I figure out why mine failed without actually being used.

Rick
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post #15 of 17 Old 03-13-2009
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Quote:
Originally Posted by timebandit View Post

This mount design will keep the motor where it belongs when the sh!t hits the fan.

Anything else is ---

Last post on this subject.

I know this is your last post but..

With the hundreds of thousands of sailing posts on the many sailing forums you'd think you'd hear of this problem, where the motor breaks free and flails around. I can't recall reading about an engine falling out of its mounts? Can you point us to some discussion on this inherent problem?

I have been in four separate knockdown incidents, in rough conditions, in my life (this is not counting spinnaker broaches while racing). In not a single one of them did the motor tear free or even break a mount. In one storm we were knocked flat three times, and to the spreader too many times to count, and other than cabinet latches failing and pots, pans and other assorted things breaking free the motor stayed put.

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post #16 of 17 Old 10-18-2014
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Re: looking for compatible engine mounts for a Yanmar YSB8

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Originally Posted by timebandit View Post
Let's just take a breath here and do a little SWAG.

A one cylinder diesel engine with transmission and accessories weighs in at 200 pounds and a four cylinder at 800 pounds. I going to guess that 70% of this weight is above the center line of the crankshaft where the mounts should be.

So there you have it, a lump of cast iron held in place by 4 rubber mounts and one solid mount, the output shaft connected to the prop shaft. All is well and good in the static world.

Now think what would happen if the two rubber mounts on the torque side were ripped and you did not know it and you had to power through fifteen foot waves...Rockin' and rollin' with that lump of cast iron just waiting to come loose and the only thing holding it any way near where it belongs is old rubber.

Powering, heck, what would happen if you were sailing and got knocked down or rolled or pitch poled!

Be vary, vary afraid.

Remember that the thing that breaks is the rubber.

Personally I would want at least one through bolt in each mount to guarantee that my motor would be kept in it's proper place but hell that is just me.
Just an update to this very old thread. I installed a new blade for my band saw today and wanted to try it out. In the trash can was a Westerbeke factory mount. I decided to do a little cut-a-way...

No through bolts but they are fully rubber isolated / dampened and captive.... If you break one of these you have waaaaay more to worry about...

Sorry for the tardy update...



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post #17 of 17 Old 10-18-2014
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Re: looking for compatible engine mounts for a Yanmar YSB8

..and apparently the new blade works just fine!!

Ron

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