Replacing engine mounts - Bukh

[isandell]

I need to replace the engine mounts on Bukh 20. Anyone done this and have any tips or hints?

Thanks

Ian

 

[EASLOOP]

I would call Bukh on 01202 668840. They have been very helpful providing me with advice throughout the re-building stages of my DV10. They will give you the facts rather than guesses.
I have nothing but praise for them.

 

[oldharry]

Two bolts in to the engine bearers one through the engine 'feet' - dead easy. Only three days work to get through the rust and undo each one /forums/images/graemlins/smile.gif.

Seriously: if you can access underneath the engine and provide some means of lifting it enough to clear the top bolt, it will be straight forward enough. Release all the bolts, and disconnect the prop shaft (you dont want to risk bending it) so the engine is just sitting on the four mounts. A lever or jack under the flywheel will allow you to lift the engine enough to release the forward mounts and insert the new ones. Easier and safer with two people. I used a block and tackle to lift the rear of the engine. Do them one at a time so the engine doesnt shift too far. If you are lifting with levers, dont have one bearing directly on the bottom of the sump without a pad to spread the load - its only a thin ally casting and could crack.

Alternatively if you can arrange a block and tackle over the unit, it only needs to rise around 75 mm to clear the engine mounts.

Getting the mount to engine bolt out if the rubber has become detached can be the bit that takes the 3 days! But doing it with the engine weight still on the foot often helps.

The new mounts will almost certainly be slightly different heights to the old ones so the engine /shaft alignment has to be re-set before you can go.

And I agree, Bukh people are extremely helpful.

 

[vyv_cox]

My experience is pretty much the same as oldharry's. The biggest problem was the rust, as my seawater pump had been leaking for a long time prior to my purchase of the boat. I managed to lift the engine using a plank as a lever because my engine bilge has a high wall forward. If you don't have access to a chain hoist you can buy a cable hoist from garden centres and suchlike for about £12. This is a very heavy engine but a large proportion of it is the flywheel, so if in difficulty consider removing it. The manual says you should renew the bolts if you do so but I have not renewed mine after twice removing the flywheel.

 

[MarkJohnson12345]

Secret with Bukh is to take off the flywheel.

Access then is a 100 times easier.

 

[oldharry]

"you should renew the bolts if you do so but I have not renewed mine after twice removing the flywheel."

OOOPs Vyv -be careful! I had a flywheel come off because it broke the bolts. Fortunately the engine was ticking over at the time, and it didnt go too far!

John Cutlers engineer told me he had one on a test bench, ran it up, and the same happened at full throttle.... it flew across the workshop and straight through a brick wall.

Now that I would like to have seen..... from a safe distance! /forums/images/graemlins/laugh.gif

 

[actionoptics]

We had a major engine problem in June 06 whilst entering the Yealm. Got a tow up to the quay at Noss Mayo and had to change the engine without any facilities. It took about one and a half to uncouple everything, including the gear box/sail drive leg, and lift the old, 10 year old, engine out. About the same time to fit the new engine with of course new mounts. The attached photo's may help and may offer some encouragement. The Bukh engine has a big ring on top to which we attached a block and tackle to the end of the extended boom. The gear box/leg were held in place by the plank with winch across the cockpit floor.

Could you lift your engine the required amount using just the plank and winch? Good luck.

 

[vyv_cox]

Congratulations on generating the widest post that the forum has ever seen! And on having such a shiny engine. Looks newer than the brand new Yanmar that replaced my Bukh. The one with the three-times replaced flywheel bolts!

 

[isandell]

Thanks. I phoned Bukh and now have set of mounts and offer to walk through the procedure for fitting and re-aligning. I am undecided about removing flywheel.

Ian

 

[actionoptics]

Thanks vyv-cox, first time posting photos. Must remember to put a page break after each one next time.

 

[chriscallender]

Ian I don't know if it helps but I lifted a Bukh 20 completely out of a boat recently. I estimated the weight of the flywheel, I can't remember the exact number now, but I think it was maybe in the ballpark of 30-40kg. Considering that a Bukh 20 might be weighing in at something in the region of 210kg it seemed like a lot of hassle to go to, when you'll still be left with a heavy enough lump afterwards.

So personally I wouldn't bother.

 

[isandell]

Bukh say that removing the flywheel is not difficult and bolts can be reused. Secret is just re-bolting to right torque and use locktite.

Removing the flywheel should make it much easier to jack up the front of the engine and also makes access to the front mounts much better.

Ian