20hp Bukh

[yindoor2]

I have a 20HP Bukh engine in the boat and have found that the throttle is a bit stiff.

It appears to be at the engine, namely at the throttle lever on top of the engine. I have been told that there are shims in there and you just take one out. It this ok as I do not want to unscew the plate and be sprayed with shims and springs and things?

Any advice much appreciated.

Many thanks Ian

 

[nordic_ranger]

Try spraying the plate (a half moon shaped part) and underneath it liberaly with WD40 or similar before you do this. It sometimes goes stiff with corrosion and this will loosen it. I had the same problem and that worked for me.
Removing shims is the last resort.

 

[yindoor2]

Thanks Jim
I will give it a go.
Regards Ian

 

[philip_stevens]

Rather than using WD40 to ease the throttle, use a release oil first (which WD40 is not) and then a silicone oil spray. When the solvent from WD40 evaporates, it leaves a sticky residue, which is OK for protecting exposed metal.

IMHO WD40 is a very old product and is over-rated, as there are better and more up-to-date products on the market today.

It was, at one time, used in the radio bays of RN helicopters, until it proved to cause more problems than it prevented. It was then only used on the skin to protect the ally and seal any gaps in the skin. I know, as I had to assist in the job of removing it from radio bays!

 

[oldharry]

No problem removing the throttle lever and shims - they wont spring everywhere! As suggested try releasing oil to free it first as they are exposed and corrosion causes stiffness.

Also, how old is the throttle cable assembly? I had problems with my Bukh20 when I first had the boat the controls were very heavy - two handed job to change gear!

Tried all the various things - releasing the throttle springs etc, dismantled and checked the gear lever detente, quizzed the local Bukh chap etc - no result, and several bumps when the thing wouldnt go out of gear at a crucial moment!

Eventually I borrowed a complete control box and cable set from the yard - and it worked perfectly! The cables on mine were free when disconnected, but on load were jamming quite severely. Worth a try?

 

[yindoor2]

Hi oldharry
The problem is at the engine, everything from the morse lever cable etc are all new. In fact the whole boat has been stripped out and everything from the engine beds (4x6 oak) to fuel system (completly renewed from the tank through pipework and fuel filters, electrics (All stripped out and replaced) and all the associated work that goes with a major refit. I found when I bought the boat that the bearers for the floor were rotten. So I basically ripped the whole lot out back to the bare hull and started again from the floor up. The wee boat had its first dip in over 10 yrs last year. Boy the satisfaction on launch day, I smiled the whole day. (its only 18ft but I now have restored a wreck back to something that has been admired by all that have seen her.

Many thanks and a Merry Christmas to all
Ian

 

[oldharry]

Mmm Its a great feeling that isnt it..... first day afloat after an extended refit / rebuild.

Taking the throttle lever off to adjust the shims and springs is not a problem, as the pressure is off the springs before the nut reaches the end of the thread. (unless far too many have been put in!).

If it feels to be still under load when you reach the top of the thread, wrap a cloth round the area to catch the bits, use a ring spanner or socket wrench on the securing nut, and put a rag over the tool as you release the last turn of thread, so that nothing can jump.