Engine mounts, rubber unstuck from steel frame. Yanmar 1gm10.

Yes, they were perfect, I also had to change on my current boat with 2GM20 when one of the original yanmar adj bolt failed, changed all again for R&D mounts and also when up a hardness, vibration also less now.
 
fredrussell said:
Were they good?
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so where they? The closest match I could find on ASAP site (for my base plate bolt spacings) was R&D Double Acting Shear Loaded Engine Mount (100-420LBS / 5/8" Stud).
they have this for sale at £84.71 incl VAT. Maybe this is inflation in action/ devaluation of the pound if being manufactured abroad. A bit pricey to replace all four, still cheaper than OEM.
 
Useful, does it matter if you use fixed or flexible mountings? I'm not sure what my current original yanmar ones are for my 3ym30 except that one is broken and two are twisted, and they had only been installed 4 years prior to me buying the boat which had one years use before going ashore. So a a better and cheaper replacement than the yanmar ones is very welcome.
 
Slowboat35 said:
What is there to lose by trying a repair?
I'm not sure about the epoxy paint though, I'd clean the metal with angle grinder and wire brush, degrease and do the same for the rubber faces, degrease again and immediately use one of the high-tech adhesives like CT1 to stick it back together. The adhesive power of that stuff, especially over a decent area like a Yannie engine mount is simply astonishing.

Only regular inspection will tell if it's worked, but why not try?

Do ensure there are no static twisting or bending loads on the mounts - accurate alignment is all for long life.
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I did this a few years ago and mine seem fine .. I am in the process of taking the engine out (prior to lockdown had the head off and ancillaries as well as mounts unbolted from bearers and did not notice any failure...

Bonding to paint of any type is related to black magic...

Clean degreased metal with sikaflex onto clean abraded rubber is not too hard to imagine a good bond....

Mine were volvo mounts... But I expect the principle remains
 
steve yates said:
Useful, does it matter if you use fixed or flexible mountings? I'm not sure what my current original yanmar ones are for my 3ym30 except that one is broken and two are twisted, and they had only been installed 4 years prior to me buying the boat which had one years use before going ashore. So a a better and cheaper replacement than the yanmar ones is very welcome.
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Depends on how much vibration you are prepared to accept but for the all the Yamars I recall they considered essential
There is a basic rule that there are three points ie mounts shaft coupling and stern glands at least one must be a solid connection
 
I think that any mounts from engineered as industrial standard like the R&D mounts would be far better than the really bad Yanmar ones, Yanmar seem to spec them a little soft and I have both times increased the rating with much better results
 
Chucking my tuppenceworth in, as reading through some replies leaves me thinking of the important, but oft' forgotten rule of the sea - that these things rarely fail in benign conditions! Having seen first-hand the damage, inconvenience and resultant cost from a diesel engine coming loose off it's mounts, my input would be to forget the repair effort and just buy new ones. The value will remain long after the price has been forgotten.
And please, please don't even consider rigid mounting. Neither the engine brackets or bearers are designed to take that type of load of vibration, and you will spend the next eternity fixing failures from the vibration - remember that movement is energy, the engine mounts serve to convert kinetic energy into heat. If you take away that source of energy transfer it will be forced to find a different path.
The ASAP mounts seem like a good solution, I agree that the 'factory' Yanmar ones are a bit naff...
 
The Yanmar mounts always tended to absorb vibration from the engine, they are susceptible to failure when in contact with a solvent like diesel...etc they are not designed to last for ever. Keep an eye on the mounts and look for black dust that's a precursor to failure.

The 1GM10 mounts come in two sizes 70 & 50 that is the shear strength they must be positioned correctly, the heavier mount should be mounted on the front of the engine and the 50's mounted at the gearbox end. If you mount them incorrectly they will work a lot harder.

Remember aftermarket mounts....R&D etc tend to be harder and you may experience more vibration than before.

Pinned mounts are available but used on larger engines that require roll over protection.
 
B58 said:
The Yanmar mounts always tended to absorb vibration from the engine, they are susceptible to failure when in contact with a solvent like diesel...etc they are not designed to last for ever. Keep an eye on the mounts and look for black dust that's a precursor to failure.

The 1GM10 mounts come in two sizes 70 & 50 that is the shear strength they must be positioned correctly, the heavier mount should be mounted on the front of the engine and the 50's mounted at the gearbox end. If you mount them incorrectly they will work a lot harder.

Remember aftermarket mounts....R&D etc tend to be harder and you may experience more vibration than before.

Pinned mounts are available but used on larger engines that require roll over protection.
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Would the harder mount not be on the heavier end ie flywheel and gearbox?
 
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