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Old 02-04-2011, 01:05   #16
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Re: How much cutlass bearing play is OK?

I was talking of a Morse bearing, not a Moss. They shoiuld be very tight around the shaft when instaled, mine was just lose. Willy
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Old 02-04-2011, 03:28   #17
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Re: How much cutlass bearing play is OK?

I had cutlass bearing problems that could end up costing me over 8K. you can read more at Bristol Channel Cutter

It's to long of a story to post here.
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Old 06-03-2016, 18:20   #18
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Re: How much cutlass bearing play is OK?

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Originally Posted by Celestialsailor View Post
The water does not lubricate the bearing by it's loosness. There are linear serations along the length of the cutless bearing that does this. A 1/16 or .062" play is excessive. When new, it should be a light slip fit. Either the bearing is worn out or the shaft is worn in the cutless area.
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Old 07-03-2016, 00:15   #19
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Re: How much cutlass bearing play is OK?

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Originally Posted by Celestialsailor View Post
The water does not lubricate the bearing by it's loosness. There are linear serations along the length of the cutless bearing that does this. A 1/16 or .062" play is excessive. When new, it should be a light slip fit. Either the bearing is worn out or the shaft is worn in the cutless area.
A few facts are needed here I think, having run a business supplying bearings for a number of years.

Bearings for shafts (or rudders) that are emmersed in water or fed with water are water lubricated. any bearing that is lubricated by a liquid (or grease) needs a small clearance to allow a film of that lubricant to establish itself as the shaft spins.

The water ways or oil ways in an oil bearing are to allow a flow of liquid to aid cooling. A water film will support a surprising amount of pressure when the surface is moving, think of it like aqua planing when you hit a shallow puddle at speed, slick tyres and you'll aqua plane earlier, same with bearings fewer water ways and the shaft will float on a layer of water sooner.

So sorry to disagree with you celestial, but I think it's important for people to know that you do need a running clearance from new to allow this film to lubricate the bearing.
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Old 07-03-2016, 04:30   #20
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Re: How much cutlass bearing play is OK?

Basically, you shouldn’t be able to feel any appreciable play.

USN Standards for Cutless Bearing Clearance ➥ http://www.pacificmarine.net/enginee...-clearance.htm

Johnson/Duramax specifies a “light press/interference fit” with 0.0008 to 0.0024" (0.02 - 0.06 mm) clearance.
http://www.duramaxmarine.com/pdf/Fla...stallation.pdf
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Old 07-03-2016, 04:56   #21
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Re: How much cutlass bearing play is OK?

All of 'em great links Gordo...
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Old 07-03-2016, 06:15   #22
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Re: How much cutlass bearing play is OK?

If the vertically, or horizontally, opposed , fwd end to aft end, of the rubber insert are worn, indicates strut is out of line.
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