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Old 05-17-2019, 12:29 AM   #1
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Shaft Bearing - Only the one.

Anyone having trouble with engine shake?
There is only 1 bearing in the P bracket and then shaft is bolted onto the gearbox.

I have had a bit of engine shake at 2000 revs. It is better now that I have the engine alignment done but it was not an easy job.
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Old 05-17-2019, 12:43 AM   #2
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Have you checked the props? I like to do the easy stuff first.
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Old 05-17-2019, 12:49 AM   #3
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Have you checked the props? I like to do the easy stuff first.
Yes, all is good underwater.
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Old 05-18-2019, 10:08 AM   #4
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Anyone having trouble with engine shake?
There is only 1 bearing in the P bracket and then shaft is bolted onto the gearbox.

I have had a bit of engine shake at 2000 revs. It is better now that I have the engine alignment done but it was not an easy job.
Lets start with make/model/year Swift Trawler/if twin engine, what side vibrating

I have a ST44. It had a vibration around 1900-2100 RPM since new. I avoided that RPM. Prop checked twice. This winter I decided to dive into it

Yard was sure it was the rear engine mounts so they changed, re-aligned, now vibration worse and a wider range of 1000-2700 RPM. Not good

They removed the shaft, machine shop said its bent (they put on lathe with dial gauge). How that happened who knows couldve been on transport ship from Europe to USA, yard/dealer crane error when boat was being loaded / unloaded, something the first dealer did (i.e. run aground, suck up dock line). The vibration was there day one when the boat was first sold, noted during the initial sea trial, and by Volvo tech that looked over engines to activate warranty. Thankfully I had it clearly documented to support the warranty claim with Beneteau.

Another ST44 owner had a similar vibration on the same side and it turned out to be his shaft-to-coupling fit-to-face and once he had that corrected he was good to go (after chasing it for a long time) but my situation doesnt seem to be that easy.

Lots to check: props, cutlass bearing, strut, coupling, coupling fit-to-face, output flange on transmission, shaft, engine mounts, how prop it sitting on shaft/keyed, etc

Someone with a dial gauge and feeler gauge can check most things. If everything is checked with boat in-water / on the hard, the final step is to remove the shaft and check it as well as the strut/cutlass.

I am hopeful this will finally be resolved soon
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Old 05-19-2019, 01:15 AM   #5
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Hey thanks this is a great help.
I'll start working down the list.
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Old 05-19-2019, 01:20 AM   #6
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Sorry, forgot to answer your question: "Lets start with make/model/year Swift Trawler/if twin engine, what side vibrating"
2018 Swift 44 with twin D4's. port side.
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Old 05-19-2019, 01:07 PM   #7
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Sorry, forgot to answer your question: "Lets start with make/model/year Swift Trawler/if twin engine, what side vibrating"
2018 Swift 44 with twin D4's. port side.
very interesting that this keeps happening on new ST44s

since the boat is so new i doubt the cutlass bearing is bad or engine mounts. so that hopefully knocks two things off the list...

please do keep us posted!
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Old 05-21-2019, 01:10 AM   #8
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Just a thought, are all the 44's running on just the 1 shaft bearing in the P bracket?
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Old 05-21-2019, 06:03 AM   #9
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Just a thought, are all the 44's running on just the 1 shaft bearing in the P bracket?
p bracket = strut?
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Old 05-21-2019, 08:56 AM   #10
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Yes, strut.
On my 44 the shaft has no bearing where it enters the hull.
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Old 05-21-2019, 12:39 PM   #11
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Yes, strut.
On my 44 the shaft has no bearing where it enters the hull.
i think that is correct. the diagrams are on beneteau's spare parts website. i am attaching them here too.
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Old 05-21-2019, 02:24 PM   #12
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I’m guessing a tweaked shaft or prop blade. I just went through everything after the transmissions on mine. One shaft was bent .005” beyond tolerance at each end and that coupler had the pilot cut back .010”. In addition, both props had been repitched by someone with a “golden hammer” because the destruction went all the way to the roots. An issue you probably don’t have.
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Old 05-22-2019, 07:49 AM   #13
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In addition to coupler faces not being machined square to the shaft, I have heard of bores that are not concentric with the hub body. All are a result of sloppy machining of the hub, and easy to overlook. Running a dial gauge on those surfaces might reveal a problem.
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Old 05-22-2019, 02:36 PM   #14
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i think that is correct. the diagrams are on beneteau's spare parts website. i am attaching them here too.
Hey that is very useful, what is the link to the website?
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Old 05-22-2019, 02:56 PM   #15
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http://spareparts.beneteauusa.com/controleur.php
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Old 05-27-2019, 03:27 PM   #16
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Looks like it is only available to US customers as my registration didn't go through.
Shame as I would like to see how I can remove the wooden steps up to the flybridge so I can varnish them.
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Old 05-27-2019, 03:30 PM   #17
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I took a video so I can go back to the agent here in NZ and see if they think this is acceptable vibration.
The footage is slowed down as at full speed it is hard to see the shake via video.

Here is the link: https://youtu.be/71wufL2I_bk
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Old 05-27-2019, 04:00 PM   #18
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I’m thinking that looks like a long bend in the shaft. It’s not particularly at either end but an arc. I’m probably wrong, but it appears, based on the shot at the PSS moving around. It should be impossible to get a proper alignment at the coupler unless it was matched to the shaft as bent or the bend starts after the coupler. Watch the video at 32-50 seconds, that PSS is still moving and shouldn’t be.
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Old 05-27-2019, 06:04 PM   #19
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Was the transmission to shaft alignment done with the boat in the water? If so, no issue there. If it was done on the hard or in the slings, it could be out slightly.
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Old 05-27-2019, 08:08 PM   #20
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Both.
The last time we did it out of the water and made it true to the strut bearing.
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