Broken bow thruster
My boat has a BCS type TSL125 electric bow thruster and the propeller 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, and it would appear the propeller can only be accessed via the tube; how would I remove it?
from the website
QBest practice would have the bow thruster motor fitted within a trunk (a bit like the weed hatch) so the whole assembly can be removed with the boat in the water. In some cases, the ease of a job and access trumps best practice in boat building so it’s likely you will have to get at least the bow clear of the water. It is also best practice to fit grids on to the tube so debris can not be sucked into the prop. These may prevent you gaining access to the propeller externally.
Aquafax (there are contacts on aquafax.co.uk) sell BCS bow thrusters,
Aso try giving them a call. Some have a plate at the base of the motor that is held on to 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 (with the tube clear of the water!).
I would expect the prop to be secured with a special nut a bit like an outboard prop locked in place by a stainless steel split pin. Normally the prop will then slide off the splines. I would also expect a rubber drive bush (or a metal sheer pin) to be between the splines and the prop itself. These bushes fail but there are specialists who can re-bush such props.
Bolts and seal hold the motor in place