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Posted: Tue Feb 24, 2009 12:42pm

Post Subject: Stern tube bearings

I own a 42'6" "Piper" narrowboat built on 2006. I am going to fit a "Centaflex" coupling between gearbox and prop shaft. What I am slightly bothered about is the additional weight of this coupling that will be supported by stern tube and engine mounts, i.e. will it affect the stern tube bearings in any way, I assume they are water lubricated.


Posted: Tue Feb 24, 2009 2:39pm

Post Subject: Stern tube bearings

Dear Peter, saying Centaflex is about as informative as saying you are going to buy a Ford. Centaflex sell several different designs of couplings. If you are referring to the long AGM unit it has an integral thrust bearing which will support the shaft once it has been fitted. If you are talking about the M or AM series then they should only allow for slight angular misalignment (2 degrees) and no radial misalignment so most of the coupling weight should be on the gearbox, not the shaft. As long as you do not try to make a coupling drive through radial misalignment when it is not designed to and do not exceed the angular misalignment you should not need to worry.

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