Reply
 
Thread Tools Search this Thread Display Modes
 
Old 05-17-2019, 12:29 AM   #1
Veteran Member
 
City: Auckland
Country: New Zealand
Join Date: Feb 2017
Posts: 25
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.
__________________
Advertisement

KiwiClive is offline   Reply With Quote
Old 05-17-2019, 12:43 AM   #2
Guru
 
Comodave's Avatar
 
City: Au Gres, MI
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 3,636
Have you checked the props? I like to do the easy stuff first.
__________________

Comodave is online now   Reply With Quote
Old 05-17-2019, 12:49 AM   #3
Veteran Member
 
City: Auckland
Country: New Zealand
Join Date: Feb 2017
Posts: 25
Quote:
Originally Posted by Comodave View Post
Have you checked the props? I like to do the easy stuff first.
Yes, all is good underwater.
KiwiClive is offline   Reply With Quote
Old 05-18-2019, 10:08 AM   #4
Guru
 
City: Z
Country: USA
Vessel Model: Beneteau Swift Trawler 44
Join Date: Mar 2017
Posts: 692
Quote:
Originally Posted by KiwiClive View Post
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
mystery is offline   Reply With Quote
Old 05-19-2019, 01:15 AM   #5
Veteran Member
 
City: Auckland
Country: New Zealand
Join Date: Feb 2017
Posts: 25
Hey thanks this is a great help.
I'll start working down the list.
KiwiClive is offline   Reply With Quote
Old 05-19-2019, 01:20 AM   #6
Veteran Member
 
City: Auckland
Country: New Zealand
Join Date: Feb 2017
Posts: 25
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.
KiwiClive is offline   Reply With Quote
Old 05-19-2019, 01:07 PM   #7
Guru
 
City: Z
Country: USA
Vessel Model: Beneteau Swift Trawler 44
Join Date: Mar 2017
Posts: 692
Quote:
Originally Posted by KiwiClive View Post
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!
mystery is offline   Reply With Quote
Old 05-21-2019, 01:10 AM   #8
Veteran Member
 
City: Auckland
Country: New Zealand
Join Date: Feb 2017
Posts: 25
Just a thought, are all the 44's running on just the 1 shaft bearing in the P bracket?
KiwiClive is offline   Reply With Quote
Old 05-21-2019, 06:03 AM   #9
Guru
 
City: Z
Country: USA
Vessel Model: Beneteau Swift Trawler 44
Join Date: Mar 2017
Posts: 692
Quote:
Originally Posted by KiwiClive View Post
Just a thought, are all the 44's running on just the 1 shaft bearing in the P bracket?
p bracket = strut?
mystery is offline   Reply With Quote
Old 05-21-2019, 08:56 AM   #10
Veteran Member
 
City: Auckland
Country: New Zealand
Join Date: Feb 2017
Posts: 25
Yes, strut.
On my 44 the shaft has no bearing where it enters the hull.
KiwiClive is offline   Reply With Quote
Old 05-21-2019, 12:39 PM   #11
Guru
 
City: Z
Country: USA
Vessel Model: Beneteau Swift Trawler 44
Join Date: Mar 2017
Posts: 692
Quote:
Originally Posted by KiwiClive View Post
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.
Attached Thumbnails
Click image for larger version

Name:	shaft diagram2.png
Views:	16
Size:	179.7 KB
ID:	89001  
mystery is offline   Reply With Quote
Old 05-21-2019, 02:24 PM   #12
Veteran Member
 
City: Mukilteo, WA
Country: USA
Vessel Name: Glauben
Vessel Model: 1988 3818 Bayliner
Join Date: Mar 2019
Posts: 30
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.
Pcpete is offline   Reply With Quote
Old Yesterday, 07:49 AM   #13
Guru
 
twistedtree's Avatar
 
City: Gloucester, MA
Country: USA
Join Date: Jan 2013
Posts: 4,595
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.
__________________
www.MVTanglewood.com
twistedtree is offline   Reply With Quote
Old Yesterday, 02:36 PM   #14
Veteran Member
 
City: Auckland
Country: New Zealand
Join Date: Feb 2017
Posts: 25
Quote:
Originally Posted by mystery View Post
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?
KiwiClive is offline   Reply With Quote
Old Yesterday, 02:56 PM   #15
Guru
 
City: Z
Country: USA
Vessel Model: Beneteau Swift Trawler 44
Join Date: Mar 2017
Posts: 692
http://spareparts.beneteauusa.com/controleur.php
__________________

mystery is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 02:08 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012