I have asked some technician regarding the repair of a lower unit's broken fin. Their answers are not clear. Anyone who know the right method please answer.<br /><br />1. Is it better to detach the lower unit from the engine before welding ? <br />2. Is it better to remove all seals and gears from the gear housing ?<br />3. Do we need to replace gear seals ?<br />4. Do we have to do anything to the water pump ?<br /><br />Thank you