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  #11  
Old 09-21-2012
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Re: cutlass bearing

Some comments on cutless replacement. It can be done without removal of the shaft by using a proper puller. But the best way is to remove the shaft. The only proper way to remove the shaft is by pushing it out of the coupling. This can be done by using a spacer (1/2 in socket works great) and some longer bolts using the engine flange to push out the shaft from the shaft flange. With the shaft out it can be properly inspected and cutless bearing is more easily installed. If a boat yard is going to do the work it is important to ASK them how they intend to remove the shaft. It they say they use a slide hammer tell them you will do it yourself. A slide hammer can damage the seal at the rear of the transmission. If you don't remove the shaft you could have calcium deposits on the shaft that will prematurely wear out the new bearing.

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Old 09-24-2012
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Re: cutlass bearing

In answer to a few comments above, from the perspective of a bearing supplier.

Cutlass and cutless have become generic names for water lubricated rubber bearings (they are rubber bearngs as the bearing surface is rubber)

As the rubber needs support they often come in a carrier which can be bronze or composite, although some vessels use a rubber insert into the grp stern tube.

There are also other types of material for marine shaft bearings which have replaced and in some cases (Maritex) improved over rubber as a bearing surface. Many years of development have gone into new materials to improve on the performance of rubber.

These composite phenolic bearings are rarely a press fit as the manufacturers prefer a clearance fit bedded on epoxy which retains the ID, as there is no bore closure from the press fit option.

Clearances are different for different materials as they have widely differing thermal and moisture expansion rates. Each manufacturer has set clearances they work to.

So as an example...
a composite Maritex bearing for a 2" shaft in a 3" carrier
Running clearance new 0.24mm or just under 10 thou
Change bearing when radial displacement approaches 1.27mm
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Old 09-24-2012
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Re: cutlass bearing

Quote:
Originally Posted by Gene T View Post
Some comments on cutless replacement. It can be done without removal of the shaft by using a proper puller.

Gene
If it is a more modern bearing bedded on epoxy this will have been a low temperature epoxy which will soften around 70-100C, it can then be slid out as it is not an interference fit, no press or puller required.
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Old 09-24-2012
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Re: cutlass bearing

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Originally Posted by Kutter View Post
If it is a more modern bearing bedded on epoxy this will have been a low temperature epoxy which will soften around 70-100C, it can then be slid out as it is not an interference fit, no press or puller required.
I wonder how many boat yards know what to do when they come across one of these new bearings?
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Old 09-27-2012
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Re: cutlass bearing

May I once again modestly point out my own cheapskate genius with the bearing puller I engineered out of Home Depot plumbing bits?

Low buck projects- Let's see 'em!
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