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Old 11-09-2020, 01:49 AM   #1
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Hi There

I am a new member based on the Gold Coast in Australia and have a 4100sca for the last three years.

The boat is out of the water and was wanting to know if anyone knows if there should be a bearing in the shaft log, as I notice I dont have one and the shaft looks pretty long not to have one.

I would appreciate any feedback
Thanks
D
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Old 11-09-2020, 05:36 PM   #2
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...... wanting to know if anyone knows if there should be a bearing in the shaft log, as I notice I dont have one and the shaft looks pretty long not to have one.
No, there is not a bearing in the stern tube/shaft log.

I've seen what looked like a weird 'internal' shaft strut between the coupler and the stuffing box that was using what looked like a wheel bearing. How long is the shaft from the coupler through the stern tube/shaft log and the first strut?
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Old 11-09-2020, 07:46 PM   #3
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Hi There
Thanks for the reply. Inside the boat where the shaft comes in there is a pss seal... is that what yoy are referring to?
Not sure about the shaft length, but it is only supported by the strut/skeg near the propeller through the cutlus bearing and tgen again by the coupler at the gearbox.

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Old 11-10-2020, 03:06 PM   #4
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Hi There
Thanks for the reply. Inside the boat where the shaft comes in there is a pss seal... is that what yoy are referring to?
Not sure about the shaft length, but it is only supported by the strut/skeg near the propeller through the cutlus bearing and tgen again by the coupler at the gearbox.
PSS is a brand of Dripless Shaft Seal. There are two methods of passing a shaft through a hull; Suffing box, or dripless shaft seal. PSS is a popular brand of dripless shaft seal. That simply allows the shaft to pass through the hull while preventing the ocean from entering the hull through the same hole.

If the shaft were too long, then you would be getting flex. If you were getting flex you'd be wearing out the cutlass bearing in the shaft strut prematurely. I doubt you need another shaft strut.
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Old 11-10-2020, 03:11 PM   #5
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I looked it up. What I was describing is called an Intermediate Shaft Bearing. You would need to have one heck of a long run to require an intermediate shaft bearing between the shaft coupler and the shaft strut. You would more than likely see wobble in the shaft and feel a vibration if you needed one.
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Old 11-10-2020, 07:55 PM   #6
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I looked it up. What I was describing is called an Intermediate Shaft Bearing. You would need to have one heck of a long run to require an intermediate shaft bearing between the shaft coupler and the shaft strut. You would more than likely see wobble in the shaft and feel a vibration if you needed one.
But this would not be a bearing within the stuffing assembly; correct?
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Old 11-11-2020, 02:44 PM   #7
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But this would not be a bearing within the stuffing assembly; correct?
No, there is no bearing inside of the stern tube/shaft log. An intermediate shaft bearing would be bolted to the hull internally, located between the shaft coupler and the stuffing box/dripless shaft seal.
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Old 11-15-2020, 09:04 PM   #8
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Thanks Shrew,
Aplogies for my late response,
that's what I also thought
Regards
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Old 11-15-2020, 09:07 PM   #9
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Thanks for the reply, thought so...appreciate it
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