Prop and cutlass bearing issue - SailNet Community

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Old 03-26-2012
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Prop and cutlass bearing issue

I took a couple of pictures of the prop as I don't understand what is going on.
That black thing on the forward side of the strut dosn't seem right.

I'm assuming it is the cutlass bearing.
The shaft is tight, no slop.
Could it be that it was replaced and that was a far as they could get it and they let it go that way or is it slipping out?
It is not supposed to look like this is it?

Also the prop needs to be cleaned obviously but someone said it needed to be replaced. How is that determination made?
I'm assuming I need to remove the prop which will require a prop puller.
I was planning on renting a standard puller from the autoparts store.
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Prop and cutlass bearing issue-p3260001-small-.jpg   Prop and cutlass bearing issue-p3260002-small-.jpg  

Last edited by davidpm; 03-26-2012 at 10:58 PM.
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Old 03-26-2012
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Your prop looks very close to the strut. Any chance something is loose inside causing the prop to hammer on the strut bearing?
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Old 03-26-2012
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Re: Prop and cutlass bearing issue

Quote:
Originally Posted by addict View Post
Your prop looks very close to the strut. Any chance something is loose inside causing the prop to hammer on the strut bearing?
Wow didn't think of that.
I will try to push the prop fore and aft and see if their is any motion.
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Old 03-27-2012
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Re: Prop and cutlass bearing issue

Interesting...

That IS the cutlass bearing. It appears to not be fully seated in the strut. It is possible that the installer was lazy, and said good enuf'. Or, as Addict has pointed out, that prop looks to be very close to the strut. The shaft may have allowed enough fore-aft movement that the prop hammered the bearing out. If so, I would check the motor mounts too!
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Old 03-27-2012
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Re: Prop and cutlass bearing issue

Unless the prop is damaged or corroded, just clean it up. The whole of the problem, however, makes one wonder if it's the correct prop, shaft and/or cutlass bearing. Could be a bad repair/replace job with salvage parts. Just guessing.
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Old 03-27-2012
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Re: Prop and cutlass bearing issue

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Originally Posted by Minnewaska View Post
Unless the prop is damaged or corroded, just clean it up. The whole of the problem, however, makes one wonder if it's the correct prop, shaft and/or cutlass bearing. Could be a bad repair/replace job with salvage parts. Just guessing.
Would you go to the trouble of removing the prop or clean it in place?

Cleaning is just a wirebrush job?
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Old 03-27-2012
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Re: Prop and cutlass bearing issue

The cutlass bearing is a bronze sleeve with the black rubber molded inside it. It appears then that the black rubber has separated from the bronze tube. If that's the case, it means the bearing should be replaced. That will involve pulling the prop and shaft.
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Old 03-27-2012
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Re: Prop and cutlass bearing issue

The prop will have to come off but not necessarily the shaft.
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Re: Prop and cutlass bearing issue

Quote:
Originally Posted by JimsCAL View Post
The cutlass bearing is a bronze sleeve with the black rubber molded inside it. It appears then that the black rubber has separated from the bronze tube. If that's the case, it means the bearing should be replaced. That will involve pulling the prop and shaft.
Some look like this;


Some (Duramax NON-Metallic) look like this;


And some (Stave-type) look like this;


So, don't be too sure about the bearing having separated from the sleeve...

That prop seems awfully close to the strut.

If it were MY boat, I would look to see if the motor has moved forward somehow, or if the shaft has slipped inside the coupling. If the motor has not moved forward, I would still pull the prop and have it re-balanced. I would also consider pulling the shaft, coupling, and the cutlass bearing, and having all three replaced.
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Old 03-27-2012
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Re: Prop and cutlass bearing issue

David,
An automobile steering wheel puller should work pretty well. We used one to get our coupling off our shaft. We used a prop puller tool to take the prop off. Pics and details of this job are here: 2011, November 30th. Begin drive train rebuild | Odalisque

This is not a really fun job but IIRC the engine is already out of this boat so it should be a bit easier if that is the case. I would advise you to remove the coupling from the shaft first with your rented or bought steering wheel puller then remove the shaft from the boat and only then try to remove the prop. Removing the prop may require some extra persuasion with a hammer and I would not like to be banging that prop which is so near the strut.

The prop will clean up beautifully with a wire wheel brush.

If the 2 blade prop is still symmetric (each fluke the same size etc.) then the prop is probably fine. You could still take it to a prop shop and have them 'spin' it for proper balance. A good shop wont charge you much (if anything) for 'spinning' it if the prop is fine.

I have a newly reconditioned 13" x 8" 2 blade prop for a 1" shaft if it turns out you need to replace the old one. I doubt it is a match though.

Good luck with this one.
The general 'rule' is that the prop should be as far away from a strut or deadwood by the same amount as the diameter of the shaft.
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