OK - so the nut isn't torqued up like on a Mercruiser outdrive leg - but it should be tight enough that the prop doesn't move, shouldn't it?
I've been looking at a unit with a replacement prop - when I looked at it there was 2-3mm of prop movement up and down the shaft, and the nut wasn't tight at all, just held in place by the split pin. Was told that it was "OK - they're all like that".
Link to a Mercury manual for you (Mercury/Mariner basically same engine different labels). With flo-torque hubs the torque figure given for castle nut & pin is 55ftlbs.
I have the factory manual for my own engine - 135hp which has a locking tab washer - & that's also 55ftlbs. http://www.mercurymarine.com/media/m...s/Flo-Torq.pdf
I think the replacement prop that was supplied either isn't the right size (length along the prop shaft), or it hasn't been supplied with the right 'adaptors' or whatever to fit it properly to that shaft.
Thanks for all the help - will be going back to tell them not to use it like that!!
Yes - the outdrive on mine (B2X) is torqued, tab-washered, and nylocked - but it does have 315 horses trying to undo it......!!
Apparently, to fit the new prop for the 50 you can add or subtract a prop washer (s/s M16) to suit... I still can't work out why a direct replacement would be so difficult...
...!!
