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hisnayres2...
hisnayres2...

Posted: Tue Oct 20, 2015 10:45am

Post Subject: bowthruster

My narrowboat has a BCS type tsl125 electric bowthruster . The propeller I has broken, where can I obtain a new one and more importantly how do I replace it? It seems the boat must be out of the water or at least the tube above the water line and it would appear the propeller can only be accessed via the tube, how would I remove it and how is it attached? Thanks Rob

Tony-B...
Tony-B...

Posted: Tue Oct 20, 2015 1:01pm

Post Subject: bowthruster

Best practice would have the bow thruster motor fitted within a trunk (a bit like the weed hatch) so the the whole assembly can be removed with the boat in the water. Regrettably in some cases ease of a job trumps best practise in narrowboat building so is is likely that you will have to get at least the front of the boat clear of the water. It would also be bets practice to fit metal grids on either side of the tube so debris can not be sucked into the prop and jamb it. These may prevent you gaining access to the propeller form outside the boat. A Google search throws up this for BCS http://www.mitgroup.co.uk/bcs. A link at the bottom of the page redirects to Twin Disc and that site lists two UK dealers. I did not find a user or parts manual there so I can only guess how the thing comes apart. Those I have seen from other makers have a curved plate at the base of the motor that is held onto the tube with nuts or bolts plus a gasket to seal it. The gasket might be stuck and require a bit of manipulation to break the seal. The whole assembly should then lift out. (TUBE CLEAR OF THE WATER!). I would expect the propeller to be secured with a specially shaped nut a bit like an outboard prop locked in place by a stainless steel split pin. Normally the prop will then slide off splines on a shaft. I would also expect a rubber drive bush (or a metal sheer pin) to be between the splines and the prop itself. These fail but there are specialist who can re-bush such props. This above is not based on any specific knowledge of your equipment. I would suggest that you contact one of the dealers listed on that website to get a manual and further advice.

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