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Old 11 September 2013, 13:48   #1
DGR
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Mariner 50 2st engine/prop question...

...does anyone know what the recommended minimum torque for the castellated prop-nut is - if there is one?

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Old 12 September 2013, 10:27   #2
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On the R.N.L.I. obms the nuts were just finger tight,just so you can get the split pin through.
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Old 12 September 2013, 13:07   #3
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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".

Not happy with that answer...
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Old 13 September 2013, 04:18   #4
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as you are not happy with that answer, you could pinch it up a little tighter with a spanner then put the split pin through the nut.
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Old 13 September 2013, 04:37   #5
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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
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Old 13 September 2013, 05:12   #6
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Paintman he has a castlellated nut, which was tightened finger tight or just pinched up to get the split pin through.
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Old 13 September 2013, 07:43   #7
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Thanks guys - really useful!!

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!!

Cheers,

D...
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Old 13 September 2013, 08:04   #8
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Slightly larger version of the first link for you. Note that both cover castle nuts (castellated).
http://dl.owneriq.net/8/819c7759-261...1ac7ee1550.pdf

If in doubt, check with a Mariner/Mercury dealer.

(ETA Mine isn't castellated but it is torqued, tab washered AND is a nyloc nut - I've heard of belt & braces but I think it might be slightly OTT!)
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Old 14 September 2013, 12:22   #9
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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...
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