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cutlass bearing

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NickVBaker View Drop Down
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Post Options Post Options   Quote NickVBaker Quote  Post ReplyReply Direct Link To This Post Topic: cutlass bearing
    Posted: 03 Apr 2012 at 8:26pm
Just before I get something wrong, would anybody be kind enough to tell me the specification of cutlass bearing I need and where to get it from. I've extracted the shaft and its 24.7mm at the bearing. Is this too worn? Its very polished and got some deeper grooves. I measured the unworn shaft between the seal and the engine coupling and it was about 24.85. So although it looks a bit dramatic, the wear is quite slight - isn't it. Or is it?

I'ld be very grateful for some comments.

Nick Baker
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George Isted View Drop Down
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Post Options Post Options   Quote George Isted Quote  Post ReplyReply Direct Link To This Post Posted: 04 Apr 2012 at 10:00am

Doesn't sound too bad to me.  My shaft was a little worn last time I pulled it out but I don't have any vibration or knocking.   The most important thing is to check the alignment of the engine/shaft as misalignment is the cause of most noise/wear problems.   Ideally alignment should be checked/adjusted with the boat in the water although it is not essential.

George Isted
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Alan Dixon View Drop Down
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Post Options Post Options   Quote Alan Dixon Quote  Post ReplyReply Direct Link To This Post Posted: 07 Apr 2012 at 3:38pm
The Shaft is 1" and the prop tube is 1 1/4" that's the spec of the cutlass they can be purchased from  T Norris  http://www.tnorrismarine.co.uk/  look at  http://www.tnorrismarine.co.uk/bearings.php code W101
Alan Dixon "Charlotte"
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Post Options Post Options   Quote NickVBaker Quote  Post ReplyReply Direct Link To This Post Posted: 07 Apr 2012 at 10:01pm
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NickVBaker View Drop Down
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Post Options Post Options   Quote NickVBaker Quote  Post ReplyReply Direct Link To This Post Posted: 07 Apr 2012 at 10:03pm
Dear George and Alan

Thank you very much for your helpful and prompt replies.

Best wishes

Nick
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GlennG View Drop Down
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Post Options Post Options   Quote GlennG Quote  Post ReplyReply Direct Link To This Post Posted: 09 Apr 2012 at 12:06am
It's definitely 1" and not 25mm?

I measured my shaft and found it was 25mm.  It was replaced three years ago.

As it happens my cutlass bearing's already warn out with about 3mm of play in the vertical direction.  I'm having it and the seal replaced this week.
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Post Options Post Options   Quote Alan Dixon Quote  Post ReplyReply Direct Link To This Post Posted: 09 Apr 2012 at 9:02am
As I understand it the original shafts were 1" (25.4mm) at I do not see a 25mm x 32mm bearing for sale at T Norris.
Beware of mixing a metric shaft with an imperial bearing you will build in 0.4mm play at the start.
I last replaced the Cutlass 2005, and when checked last year was still in good condition with 1100 hours use behind it
Alan Dixon "Charlotte"
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Post Options Post Options   Quote NickVBaker Quote  Post ReplyReply Direct Link To This Post Posted: 10 Apr 2012 at 9:12am
Before I order from Norris, and thinking about George's comment about alignment, does anyone have any experience of using an R&D Flexible Coupling. They make one for the Yanmar for about £70 - seems good value to me. Also, while I've got my credit card out, should I replace their deep sea seals?
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Post Options Post Options   Quote George Isted Quote  Post ReplyReply Direct Link To This Post Posted: 10 Apr 2012 at 10:02am
Concerto has a R&D Flexible Coupling, this probably helps quite a bit as the 2GM being a 2-cylinder does shake about a fair bit at tickover.  I can't tell you if it made a difference to wear or noise but I have not(touch wood) had any problems with the sterngear.
George Isted
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Post Options Post Options   Quote NickVBaker Quote  Post ReplyReply Direct Link To This Post Posted: 10 Apr 2012 at 10:54am
Thank you, George. I guess I would have to shorten the shaft by the length of the coupling (32mm) this could have the beneficial effect of moving the slightly worn part partially out of the cutlass bearing - what do you think?
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