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Go Back   SailNet Community > On Board > Gear & Maintenance > Cutlass bearing replacement
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Thread: Cutlass bearing replacement Reply to Thread
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Topic Review (Newest First)
09-08-2013 03:38 AM
Kutter
Re: Cutlass bearing replacement

There are a number of companies that supply composite bearings to what ever size of shaft, carrier and length you require. Just search for composite marine bearings and you'll find one. This is what is typically used in commercial boats these days.
08-10-2013 01:39 AM
CalebD
Re: Cutlass bearing replacement

This is the only bearing then that will fit your situation from my link: Johnson Duramax - Cutless Bearings Naval Brass Sleeve: Standard Size, Model Number: BOSS
You might (or might not) have to shave 1/2" off the bearing in my link as it is 6" long - you know, regular size!!!
That link I posted also sells non-brass bearings.

The standard 4" naval brass bearing for a 1" shaft have worked flawlessly for us for just over a year now.
08-09-2013 11:28 PM
SOVT
Re: Cutlass bearing replacement

Caleb

It's 5.5" long, 1.5" shaft by 2" od

Just seeing if anyone had good/bad experiences with a paticular bearing.
Thanks for the link

Mike
08-09-2013 11:09 PM
CalebD
Re: Cutlass bearing replacement

Progress.

You need a bearing that fits your stern tube and shaft diameter (sounds kinda dirty no?).
Choose one of these and be done with it unless you want a fancier composite Cutless bearing: Cutlass Bearings - Johnson Duramax Cutless Bearing - Naval Brass Inch
4" seems to be a fairly standard size length for these bearings.

Brown stuff: could be old polyester resin? Who knows. Replace it with thickened epoxy.
08-09-2013 10:51 PM
SOVT
Re: Cutlass bearing replacement

Ok, some gentle surgery with a sawsall got the bearing loose enought to see the grub screws. Another couple of questions.

There are a number of cutlass bearings that meet the size specs. Any recommendations as to make and model?

The grub screws were bedded in a brown putty like material. Any idea what this might be?

Thanks again
Mike
07-31-2013 05:45 AM
Kutter
Re: Cutlass bearing replacement

Why don't you just bed bearings on epoxy as a clearance fit? no press required. This is done on many bearing installations. Removal is also easier, if it's in a metal carrier just heat the carrier and the epoxy softens, if it's in GRP or wood you can coat the bearing in release wax before it's fitted then it can be split away from the carrier with a sharp narrow chisel. This method is proven to be quick, easy and reliable.
07-21-2013 03:53 PM
SOVT
Re: Cutlass bearing replacement

Thanks all for the great responses.

I have a couple of days off this week and am going to dive into this.

Thanks again
Mike
07-21-2013 09:28 AM
JimsCAL
Re: Cutlass bearing replacement

You're going to have to do it anyway, so just remove the rest of the shaft. Even if there are setscrews that are buried that you can't find at this point, you should be able to remove the bearing by splitting it into pieces and/or collapsing it.
07-21-2013 08:47 AM
smurphny
Re: Cutlass bearing replacement

On my A35, the fiberglass surrounding the cutlass has set screws in both sides, tapped right into the glass. They HAVE loosened in the past. I have built up the glass around them to give the allen screws a better bite. Yours may be buried in the glass. Maybe grind the area clean so you can see them. When inserting a new cutlass, mark where any set screws contact the bronze tube of the bearing, then remove the cutlass and drill an inset depression for the set screws to go into. It may pay to set the screws in epoxy and even epoxy them in completely. They can always be drilled out easily.
07-20-2013 09:48 PM
CalebD
Re: Cutlass bearing replacement

We did this job back in winter of 2011/12. Our cutless bearing was similar to yours, eg., in the dead wood of the keel, in a cutaway of the rudder. It had no set screws.
We tried forcing the press fit out using the threaded rod, washers, nuts, curses and sweat method - no joy. We had to resort to Plan B of using a Sawzall with a fresh metal blade. It wasn't pretty but it came out with minimal damage to the stern tube. If you go this route make sure to clean out the stern tube well before trying to press in the new bearing. I've read that freezing the new cutless in dry ice can help shrink it when you go to install. We didn't try this. We didn't even use dish soap which would have helped. Pressing the new bearing in was a bytch.

We also cut our shaft inside the boat, behind the engine. Made getting both the prop and coupling a lot easier to remove from the shaft pieces.

Long winded version here: 2011, November 30th. Begin drive train rebuild | Odalisque
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