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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Early Cutlass bearing wear. Is this a problem?
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Thread: Early Cutlass bearing wear. Is this a problem? Reply to Thread
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Topic Review (Newest First)
07-13-2012 08:54 AM
smurphny
Re: Early Cutlass bearing wear. Is this a problem?

It's tough to try to use a gauge on the shaft when it's in the boat. The right way is to get it out and set it on two sets of bed blocks (you can make them from any sturdy metal wheels, even old roller skate wheels will work) with a stable, moveable platform for the depth gauge. Then you can rotate the shaft on the blocks and check it for deflection all along its length, including the taper and the keyed section that enters the flange.
07-12-2012 11:12 PM
Geoff54
Re: Early Cutlass bearing wear. Is this a problem?

Quote:
Originally Posted by Brent Swain View Post
Holding a dial caliper on the shaft, while slowly turning it, will tell you if it is bent
I take you mean a dial gauge (DTI) not a dial caliper - or am I missing something?
07-12-2012 11:02 PM
Brent Swain
Re: Early Cutlass bearing wear. Is this a problem?

Holding a dial caliper on the shaft, while slowly turning it, will tell you if it is bent
07-12-2012 07:00 PM
smurphny
Re: Early Cutlass bearing wear. Is this a problem?

If your prop is dog-eared, you can often fix it in-place yourself with a couple of opposed small sledge hammers. Getting the prop off some boats is a major operation. Sailboats usually have very short(4' or so) shafts, so whip or a bent shaft is seldom the problem. You're also not dealing with a strut (or are you?) that's out of whack. I would agree with those above that the prop is likely the problem. Even a small misalignment at the coupling would not cause premature bearing wear like that.

Also check the water passages that allow water flow into the bearing. A dry bearing fails quickly.
07-11-2012 09:20 PM
Brent Swain
Re: Early Cutlass bearing wear. Is this a problem?

I use a piece of shaft the same diameter as my main shaft with the taper cut on it, and two drill holes ,one on either end. I put the prop on this taper. A jig which holds the prop, on this shaft thru two sharpeened bolts in these pin holes lets me see which is the heavier blade. If I grind the heavier one down, to the point where, when I spin the prop, it stops at a different point every time, the prop is balanced. Leaving this shaft a bit long, lets you hold a patten on the blade and line it up with the shaft for pitching it.
07-11-2012 11:13 AM
Kutter
Re: Early Cutlass bearing wear. Is this a problem?

As a bearing supplier it can often be bearing carrier alignment that is not noticed, look carefully at the clearance at either end of the P bracket if the boat has one.

It is also not engine hours that wear a bearing as when it is running the shaft is on a film of water so there is no wear. The bearing material (or shaft) wear at start up and run down and the wear can be accelerated by the type of sand or silt in the water column. So a boat that does many short runs (as yachts often do in the Solent) will see higher wear than a motor boat. Most yachts will start and stop the engine twice for every journey as they motor out of or into a marina/anchorage a mobo only does this once so will see half the wear.

Acceptable bearing cearances will differ for different bearing materials/suppliers.
05-14-2012 12:43 PM
zeehag
Re: Early Cutlass bearing wear. Is this a problem?

check motor mounts. a problem is usually reflected elsewhere in the line of items to be addressed. alignment is important. 65 hours can be good IFF the engine was on good mounts. if not, can be what you found.
05-14-2012 11:13 AM
DivingOtter
Re: Early Cutlass bearing wear. Is this a problem?

Quote:
Originally Posted by eherlihy View Post
A local propeller shop would be able to clean and balance your prop. It should cost ~$100, if you can get it off the shaft. Many prop shops do not work ON boats.
Thats why i have deal with a local prop company. I pull the wheel in water, deliver it to the shop, pick up and replace in water. Its all about making people happy.
05-13-2012 01:35 PM
GrahamO
Early Cutlass bearing wear. Is this a problem?

Thanks for the info.
05-10-2012 05:15 PM
eherlihy
Re: Early Cutlass bearing wear. Is this a problem?

Quote:
Originally Posted by GrahamO View Post
How do you balance a prop? Just make sure it is clean?

Pity you cannot take it to the local tyre shop....
A local propeller shop would be able to clean and balance your prop. It should cost ~$100, if you can get it off the shaft. Many prop shops do not work ON boats.

New England Propeller is located in Plymouth, MA, and Roses in Glocester, MA are two recommended ones.
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