Beneteau cutless bearing

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Sandy Stone

Sandy Stone

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Jun 2, 2007
404
Beneteau First 375 Slidell, LA
Well, MS, I do appreciate the information as well as the wishes for good luck. I have to ask you, though, do you truly think the strut on most boats is lined up accurately enough that a few thousands of an inch compression of the bearing will make a difference? Or is it you think I'm going to spin the bearing because it's not in tight enough? No sarcasm, I'm just trying to make sure I understand your concerns.
 
RichH

RichH

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Feb 14, 2005
4,773
Tayana 37 cutter; I20/M20 SCOWS Worton Creek, MD
The strut alignment has to be 'reasonably' aligned with the center line of the engine or you will risk adverse wear in the cutless. The danger of an 'errant cutless' is destruction of the shafting (expensive).
One has to remember that the function of the cutless is to develop a 'hydrodynamic film' of water in the clearance between the bearing and the journal surfaces of the shafting --- not too large or the film will 'squeeze out', and not too tight or there wont be sufficient 'film' ... and if thats not correct and the proper thickness of 'hydrodynamic lift' developed due to the 'film' then you will/can: 1. quickly abrade the bearing 2. abrade away or cut the shaft.

Although not at the same operational temperatures and speeds, setting a cutless with 'glue' and ignoring the correct and needed final installed clearances (including alignment straight though to the transmission output flange center of rotation), etc. would be analogous to installing engine crankshaft bearings in an automobile by gluing them in after 'driving them home' with a hammer. Same order of magnitude.
 
T

tommays

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Oct 2, 2006
1,517
Jboat J24 commack
I just spoke to believe it or not Rich at Duramax about the issue and while they would love to see .001 to .002 stuff happens and they recommend and he does not feel there will be and issue

http://www.chockfast.com/ which is ITW ship building products and only because they don't want to strong of a retainer
 
Maine Sail

Maine Sail

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Feb 6, 1998
11,689
Canadian Sailcraft 36T Casco Bay, ME
Why the right fit in the strut is important.



And a band-aid fix:
 
woodster

woodster

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Sep 15, 2009
6,243
S2 9.2a Fairhope Al
Maine ...i have noticed in the temp repair video that the strut was ss.....i have been told that when useing a ss strut the vibration noise in magnafied consideralby and it is better to use a bronze strut instead.....what are your thoughts on this......

regards

woody
 
Maine Sail

Maine Sail

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Feb 6, 1998
11,689
Canadian Sailcraft 36T Casco Bay, ME
woodster said:
Maine ...i have noticed in the temp repair video that the strut was ss.....i have been told that when useing a ss strut the vibration noise in magnafied consideralby and it is better to use a bronze strut instead.....what are your thoughts on this......

regards

woody
Click to expand
I don't recall ever seeing more than one or two European boats with SS struts. Most all sailboats use Manganese Bronze or Nibral struts. Only builders like Hinckley, Lyman Morse, Morris etc. use Nibral due to cost. Manganese Bronze is the most widely used but it does need to be protected as it is about 38-40% Zinc. Personally I don't like the use of SS below water and much prefer AQ22 or a variant like Nitronic 50..
 
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