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

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niallw70

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A quick search of the forum, tells me I'm by far not unique in suffering this problem. Hopefully some other forumites who have experienced this problem would like to offer their solutions. Due to the horrendous cost and seeming vulnerability to diesel I hope to aviod replacing with more Yanmar engine mount.
A visual inspection of the mounts in situ made me decide to remove all four mounts for an easier inspection. Sure enough in blocking up my engine with wooden block in its confined space a bit of sideways force was put on the worst looking mount which was enough to completely destroy it! See the accompanying photo and note how the rubber shows a layer of rust over almost all the adhered surface.
Having issues uploading my pic, website says my image too big.
Anyway, I'm going to put out my latest idea of how to sort this without it costing me too much, feel free to shoot it down! I'm considering buffing down the steel components of mounts, paint with my Jotun epoxy paint, use a good quality oil/waterproof flexible adesive/sealant/filler to bond the rubber blocks and steel back together, leave to set. I've got time on my side, dont have to reinstall until March/april.
Alternatively I purchase new engine mounts (just not Yanmar ones), in this case I'd appreciate feedback on the model/brand most suitable for the quite heavy engine vibration you get with the Yanmar single cylinder. Also if anyone knows of a UK based retailer
 

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I'm considering buffing down the steel components of mounts, paint with my Jotun epoxy paint, use a good quality oil/waterproof flexible adesive/sealant/filler to bond the rubber blocks and steel back together, leave to set.

You have nothing to loose.
So give it a go.


gary
 
niallw70 said:
.......feel free to shoot it down! I'm considering buffing down the steel components of mounts, paint with my Jotun epoxy paint, use a good quality oil/waterproof flexible adesive/sealant/filler to bond the rubber blocks and steel back together, leave to set. I've got time on my side, dont have to reinstall until March/april......
Click to expand...

It won't work, a complete waste of time and effort.
 
The problem is that you have a diesel leak you will need to fix it,you shoudnt have that amount of diesel leaking to destroy your engine mounts.You will need to buy new mounts.
 
Had the same on a 1GM. Swopped them out for a fresh set from (need to check, papers not to hand) at a fraction of the price. But, had to redrill and tap the bearers along with spacers to raise the new mounts. Eventually changed to a 1GM10 and used the same mounts.
It would be possible to put the new mounts on plates to match the old holes in the bearers.
 
Not worth wasting the time. You are not helping either by glueing to a painted surface. It looks like this poor engine mount has put up with a lot over the years and now needs to be retired. The new ones are not cheap but then they will not be glued together but correctly bonded. Try and obtain similar to make life easy.
 
The Yanmar ones are a very poor design and not designed to last. Good business for Yanmar as replacements are ridiculous price of about £100 each. They have no positive locating metal through the rubber and so if the rubber fails the engine will go walkabout.
I replaced mine with ones from ASAP but there are many other alternatives.
 
In response to PeteK, over the years, i think I have been quick to spot and sort any leaks, (surely noone enjoys the smell of diesel which ends up permeating the entire boat). However, I have had to bleed my engine countless times over the past 12 years of my ownership, each time I conduct this operation with difficulty in my confined engine bay, i end up spilling a not insignificant amount of diesel.
Over the years suffered problems with dodgy fuel injector, water/diesel bug in fuel, trouble-shoot compression/ non start problem. Each occasion usually requires bleeding engine before I can test. I've noticed for a good while now the mounts on the starboard side of engine, the rubber showing signs of distress and delamination, the starboard mounts are closest to and below the fuel line components, in-line filter, fuel injector pump, etc.

I do look forward to the day, I can finally say goodbye to my troublesome diesel donkey and install maybe a rechargable electric motor and bank of batteries
 
i suspect Penberth is correct and you really are wasting your time, especially if you intend to glue onto paint ... i feel your pain as i have also looked at new prices and have considered non Yanmar ones tho never got round to sourcing any as mine ( all 8 !! ) are thankfully looking as new ,,, what i do do is ( as you mention ) with the seemingly excessive motion at tick over i raise the tickover until it moderates the rock / vibration , just a few revs makes all the difference and hopefully will extend the life of those expensive rubbers ,, also mine are kept bone dry and clean .
PS ,, is it possible to throo bolt the rubber onto the metal plate ?
 
A problem I see looking at specs of replacement mounts, the ones I've looked at dont (from Silent marine) don't match the bolt spacings welded through my base plates. This would be another additional expense to get new base plates made to match new mounts. Hence my idea to try rebonding my existing mounts, but I do agree with Penberth, may turn out to be a waste of time in the long run.
The closest fit of mount Isee on silent Marine is their SM1609 but bolt holes 140mm spacing and not quite enough flat area to drill more holes
I will try searching for ASAP, as suggested.
On diesel spills until recently I had'nt realised the effect of this spilt diesel was having. Now I know I intend to have ample supply of rags to prevent future problems.
 
niallw70 said:
A problem I see looking at specs of replacement mounts, the ones I've looked at dont (from Silent marine) don't match the bolt spacings welded through my base plates. This would be another additional expense to get new base plates made to match new mounts. Hence my idea to try rebonding my existing mounts, but I do agree with Penberth, may turn out to be a waste of time in the long run.
The closest fit of mount Isee on silent Marine is their SM1609 but bolt holes 140mm spacing and not quite enough flat area to drill more holes
I will try searching for ASAP, as suggested.
On diesel spills until recently I had'nt realised the effect of this spilt diesel was having. Now I know I intend to have ample supply of rags to prevent future problems.
Click to expand...
would it not be possible to extend ( weld on ) some extra length to the flat area , ( i asume you mean on the mount not on the bed )
 
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.
 
R&D mounts have a direct replacement and also have a top hat that protects the rubbers, it’s a different design but hole centres and height to replace the Yanmar ones, details are on ASAP web site, I swapped mine on the last boat as I had a similar failure, swapped all 4 for £100 and 1 hours work.
 
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