Cutless bearing

[BabaYaga]

As the gap between shaft and housing is fixed, thicker brass means thinner rubber and vice versa.
We need some expert input as to the pros and cons please.

That could be interesting. My guess is that thickness of rubber is not over critical.
For 25mm shafts, Tor Marine makes brass shell bearings for housings with IDs 31.75, 35.0, 38.1 and 40.0. Most likely the ballast will be rubber, but the thinnest one probably also has a thinner brass shell (BTW they call that series 'English type*).

 

[Tranona]

That could be interesting. My guess is that thickness of rubber is not over critical.
For 25mm shafts, Tor Marine makes brass shell bearings for housings with IDs 31.75, 35.0, 38.1 and 40.0. Most likely the ballast will be rubber, but the thinnest one probably also has a thinner brass shell (BTW they call that series 'English type*).

That is correct. Imperial sizes (both UK and US) had 3 or 4 different housing diameters whereas metric originally had mostly one size, although 30mm has a choice of 40 or 45mm outside. Many UK boats were fitted with metric shafts so there is a need for metric inside with Imperial outside. see here lakesterngear.co.uk/catalogue.pdf. The bearings are actually made in Holland, but UK manufacturers such as Montrose offer the same.

 

[Dellquay13]

To get old one out use a reciprocating saw with long blade for metal in. I did mine using hacksaw blade - took an age. I’ve since learnt the pros use reciprocating saw.

Maybe I need to tell the pro who took hours hacksawing mine out how to get the job done quicker in future…

 

[rogerthebodger]

. . . for P brackets

Yes so where is he cutlass bush that the OP wished to remove.

A extended version of thi can be used to remove cutlass bushed from a stern tube as I did with my previous long keep boat

My current boat dos have a P bracket but also a bush at the aft end of the stern tube

All that needs is tto remove the stern seal and ft the device down the stern tube which is easy as the OP has alreadc remober the pron shft so the all thread can pass down the stern tube

 

[billyfish]

Hurrah got it out it did need a hacksaw but not too bad.

 

[MontyMariner]

Yes so where is he cutlass bush that the OP wished to remove.

A good question. I assumed that it wasn't on a P bracket because he had taken our the prop shaft. Looking back through the posts he doesn't actually say.

 

[billyfish]

No not a P bracket.

 

[Neil_Y]

I may be biased but we supply composite bearings to a wide range of commercial and leisure vessels. The bearing material is composite (no rubber) The tubes of raw material are machined to suit the type of fit you want and waterways are added. In practical trials Maritex lasted at least three times as good rubber bearing, we also see less shaft wear. There are a few theories why that is.
Each bearing is made to suit the shaft and carrier of the vessel. We advise using a clearance fit bedded on epoxy, you can slide it in by hand and turn it. Epoxy softens with heat which aids removal. It's important to understand that a bearing made for a clearance fit or alternativel an interference fit are actually made a different size. With a press fit the bearing is squeezed and the ID is reduced so the finished size will be a larger ID than a clearance fit.
There is no standard length or size of ID and OD as they are made to suit the carrier and shaft. The composites we work with for marine use are phenolic based fibre reinforced that have lubricants in the matrix and also some materials that may reduce marine growth. This is what they look like.

 

[Poignard]

That's useful information Neil. Thanks.

How do prices compare with the usual rubber cutless bearings?

What's the lead time?

For example, my rubber cutless bearing is O/D 1-1/4" I/D 1" Length 2-3/8"

 

[billyfish]

I may be biased but we supply composite bearings to a wide range of commercial and leisure vessels. The bearing material is composite (no rubber) The tubes of raw material are machined to suit the type of fit you want and waterways are added. In practical trials Maritex lasted at least three times as good rubber bearing, we also see less shaft wear. There are a few theories why that is.
Each bearing is made to suit the shaft and carrier of the vessel. We advise using a clearance fit bedded on epoxy, you can slide it in by hand and turn it. Epoxy softens with heat which aids removal. It's important to understand that a bearing made for a clearance fit or alternativel an interference fit are actually made a different size. With a press fit the bearing is squeezed and the ID is reduced so the finished size will be a larger ID than a clearance fit.
There is no standard length or size of ID and OD as they are made to suit the carrier and shaft. The composites we work with for marine use are phenolic based fibre reinforced that have lubricants in the matrix and also some materials that may reduce marine growth. This is what they look like.

What's the company Web?

 

[Neil_Y]

That's useful information Neil. Thanks.

How do prices compare with the usual rubber cutless bearings?

What's the lead time?

For example, my rubber cutless bearing is O/D 1-1/4" I/D 1" Length 2-3/8"

Nominal 25.40 x 31.75 x 60.3 with three waterways £41.73 ex vat... but as they come from a factory in Australia we would wait to send it when we have a batch to ship at the same time. Exalto UK can supply them. If I do one off the shipping charge is huge but Exalto will probably be cheaper as it will go in a box with other orders for them. We send batches to exalto every two weeks or so. Most of it bearings for water pumps.

 

[Neil_Y]

What's the company Web?

Maritex bearings Perth WA makes them H4 Marine or Exalto UK supply them in Europe

 

[Poignard]

Nominal 25.40 x 31.75 x 60.3 with three waterways £41.73 ex vat... but as they come from a factory in Australia we would wait to send it when we have a batch to ship at the same time. Exalto UK can supply them. If I do one off the shipping charge is huge but Exalto will probably be cheaper as it will go in a box with other orders for them. We send batches to exalto every two weeks or so. Most of it bearings for water pumps.

Thanks a lot. I have made a note of this for when I next need one.