In Boaters Update we asked what boat maintenance topics you’d most like to read about. Prop-shaft coupling maintenance was very high on your list. Thanks to the experts at River Canal Rescue, here's what you need to know to keep your prop-shaft happily coupled.
Prop-shaft couplings need regular maintenance to make sure they stay secure. When the bolts on the coupling become loose or disconnect all together, this can cause extensive damage. The worst-case scenario is the engine being thrown off its mountings potentially damaging the stern gland, prop-shaft, coupling, gearbox and engine mounts, plus any external components that may become trapped when the engine shifts. The cost to rectify can go into the thousands.
Unfortunately, this kind of occurrence is still relatively common due to boaters overlooking maintenance in this area. Everyone knows filters and fluids need maintaining, however ensuring bolts are tight tends to be less recognised. The worst part is, this is one of the simpler maintenance tasks and easier to identify than a loose engine mount or slack fan belt.
Simply undertake a weekly visual check. When you get into the engine room to check oil levels etc., just take a peek at the prop-shaft components and ask yourself the following questions:
If you answer yes to any of these, it’s a sign your prop-shaft coupling may be coming loose or is already loose and causing damage. By spotting a potential problem now, you’ll avoid further expensive damage later.
You will need access to a set off spanners (or a spanner wielding friend).
Make sure your engine is turned off and that the engine room is safe to enter before you start any work:
If this becomes a regular occurrence it’s time to question ‘why’? Ask an engineer in to check the engine over as the engine maybe out of alignment, have damaged engine mounts or a faulty coupling. Awareness is the key to maintenance in this case.
With thanks to River Canal Rescue for their advice.
Last date edited: 11 February 2019