Re: [Amel Yacht Owners] Bow thruster shaft removal

Bill & Judy Rouse <yahoogroups@...>


Your problem was caused by a small amount of  saltwater water passing the foam and lip seals.

When was the last time it was serviced? It should be serviced every two years.
Do you use the locking pin? If not, even new seals may leak a little in rough seas.

What commonly happens is that the above mentioned small amount of saltwater causes oxidation (rust) on the cast iron base of the electric motor. This causes the clearance for the tube to become smaller and the tube becomes bound inside the cast iron base of the motor.

I would not recommend heat because you may damage the tube. I would not recommend pulling the bow thruster out as you described because I think that you will break the foot.

The best solution is to spray copious amounts of penetrating fluid through the bolt holes and into the space between the tube and base of the motor from the bottom. Using the clamp-on special tool apply as much downward force on the tube as you can, then find something to vibrate that cast iron base... possibly an impact tool. Don't hit it with a hammer, because it is cast iron and it will break. You will also need lots a patience because it may take hours of vibration and downward force. Possibly a rubber mallet could work as well to provide enough shock while the tool is applying downward force.

There is another method which works, but usually only with a light amount of rust. That is to disconnect the cable at the top of the motor and from under the boat push the thruster up and pull it down quickly. The shock of hitting the bottom may break the tube loose from the motor. If this doesn't work in 6-8 tries, it probably won't work at all.

Of course everything I suggested could be overdone causing something else to break.

You did not say where you are. If you were near me, or possibly another owner, you could possibly have a volunteer to help you.

Bill Rouse
BeBe Amel 53 #387
Currently Trinidad, Crews Inn Marina
Sent from my tablet
+1832-380-4970 USA Voice Mail

On Jun 30, 2016 5:03 PM, "francesringley@... [amelyachtowners]" <amelyachtowners@...> wrote:



I am trying to service the Bow Thruster and following the procedures given in the files section and various threads.

I have removed the band clamp, the four hex bolts and washers. But the shaft did not descend.

I used the Amel special tool and it moved about 3/4". But the tool kept slipping and the shaft would move no further. So as we torqued the nut, the bolt broke.

Next we tried torching the collar as much as we dared. No movement.

We have tried reefing down on the fairing with each of the above strategies. But we can only go so far without damaging it. 

Our latest effort has been to back up a pickup truck with a trailer hitch to just below the thrus ter, then connect a come along to the rectangular trunk piece and the hitch. Then we reefed on  the come along.  Truck went up. No shaft came down.

Now I am completely stumped. Any ideas from the group? What am I missing? 

Ian Townsend
Loca Lola II

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