Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 13-05-2024, 17:03   #1
Registered User

Join Date: May 2024
Location: Alabama
Boat: Victoria 30
Posts: 1
Should I cut this shaft?

I'm trying to pull the engine and need to disconnect the coupling. I've not seen any videos or photos of one this bad, plus it's very difficult to access. It's a Yanmar 2GM20F in a Victoria 30.

If it doesn't break loose from the engine, should I cut this shaft? I can pull the shaft out after the engine is out from the inside, and then try to get it off.

Any advice?
Attached Thumbnails
Click image for larger version

Name:	IMG_0213.jpeg
Views:	281
Size:	361.3 KB
ID:	289837  
billabel is offline   Reply With Quote
Old 13-05-2024, 17:19   #2
Registered User
 
Nekton73's Avatar

Join Date: Mar 2022
Location: Canada
Boat: Grampian 30
Posts: 280
Re: Should I cut this shaft?

Assuming you otherwise want to save the shaft and consider it serviceable, I think I would try to pull the shaft out of the coupling first. You could start by drilling out what looks to be two set screws on either side (your pic attached with red arrows). That might free it up enough to pull it out.
If not, grind off the heads of the bolts holding the coupling together and attempt to chisel the two halves apart.

If still no joy, use an angle grinder to square the flange off the coupling, removing a lot of the rusted together material, and exposing a nice large flat mating joint to chisel again.
If still thwarted, cut the coupling along the axis of the shaft as close to the shaft as you can and use a chisel to split it apart that way. You could even cut it in halves or quarters.



Name:   coupling.jpeg
Views: 913
Size:  34.7 KB
Nekton73 is offline   Reply With Quote
Old 13-05-2024, 17:47   #3
Registered User
 
Searles's Avatar

Join Date: Feb 2020
Location: Port adelaide south australia
Boat: Cheoy lee perry 48
Posts: 755
Re: Should I cut this shaft?

No need to cut the shaft ,cut the heads off the coupling bolts and tap them out ,if space to g box is to small cut the bolts o under the nuts this will gain space ,once the engine is out ,remove the prop and key and pull the shaft inboard after slacking off the stuff box ,now much easier to work on ,if the coupling refuses to move carefully cut the shaft along the key way .
Searles is offline   Reply With Quote
Old 13-05-2024, 20:33   #4
Registered User

Join Date: Mar 2016
Location: San Francisco
Boat: Morgan 382
Posts: 3,060
Re: Should I cut this shaft?

It doesn't look to me like the coupler or shaft are salvageable. Best case I see, is that after a lot of work you cut the bolts, separate that shaft and remove the engine. Then you will be unable to get the coupling flange off the shaft, and thus be unable to install a new coupling, or have the shaft fit to a new coupling. You will need to cut the shaft to get the shaft out of the boat anyway.

So cut it.
__________________
-Warren
wholybee is offline   Reply With Quote
Old 13-05-2024, 20:59   #5
Registered User

Join Date: Mar 2007
Location: Santa Cruz
Boat: SAnta Cruz 27
Posts: 6,843
Re: Should I cut this shaft?

A new shaft will be about $500. Getting the coupling with penetrating oil, all thread, and
a series of sockets inside the coupling will probably take about 12 hours. Your choice.
donradcliffe is offline   Reply With Quote
Old 13-05-2024, 22:21   #6
Registered User

Join Date: Aug 2021
Location: PNW
Boat: 35 Ft. cutter, custom
Posts: 2,461
Re: Should I cut this shaft?

I would do as a previous poster said.
Cut the heads off of the bolts, drive them out.
Pull the engine, then pull the shaft.
Make sure there are no pins/setscrews locking the coupling to the shaft, if so then get them out by whatever means necessary.
Then if "homework" doesn't get the coupling off take it to a shop.
A 20-ton press will have no trouble.
Life will be easier if the new coupling is of "split" design using pinch bolts.
When you install the pinch bolts and coupling bolts don't be stingy with the anti-seize.
__________________
Beginning to Prepare to Commence
Bowdrie is online now   Reply With Quote
Old 13-05-2024, 22:50   #7
Moderator

Join Date: Feb 2010
Location: Australia
Posts: 3,480
Re: Should I cut this shaft?

It doesn’t look terrific BUT, it seems like luck’s on your side…… that looks like a pinch coupling and possibly only a 2 bolt pinch so all you need to do is A. Confirm that it is actually a pinch/split coupling, B. Get a padsaw and cut the bolt shanks in the split, C. Drive a wedge into either or both sides of the split to open up the slot and it should come loose. This process relies on the bolts NOT being scalloped into the propshaft, if they are, you’re doomed to splitting the entire coupling which is actually not such a big deal with a pinch coupling, most of the hard work is already done ( the split) so only the flange needs to be sawn through, still not a walk in the park but way easier than sawing the length of the hub.
skipperpete is offline   Reply With Quote
Old 14-05-2024, 03:36   #8
Registered User
 
NYSail's Avatar

Join Date: Jan 2012
Location: Long Island, New York
Boat: Beneteau 423 43 feet
Posts: 863
Re: Should I cut this shaft?

My last boats coupling was that badů.. I k it the shaft side of the coupling then cleaned the transmission side. Had the shaft and prop serviced and they put on a new shaft side coupling.

Greg
NYSail is offline   Reply With Quote
Old 14-05-2024, 04:00   #9
Registered User
 
NYSail's Avatar

Join Date: Jan 2012
Location: Long Island, New York
Boat: Beneteau 423 43 feet
Posts: 863
Re: Should I cut this shaft?

My last boats coupling was that badů.. I k it the shaft side of the coupling then cleaned the transmission side. Had the shaft and prop serviced and they put on a new shaft side coupling.

Greg
NYSail is offline   Reply With Quote
Old 14-05-2024, 05:10   #10
Registered User
 
pcmm's Avatar

Join Date: May 2014
Location: Whitby, Canada
Boat: Morgan Out Island 41
Posts: 2,283
Images: 2
Re: Should I cut this shaft?

Soak it in PB blaster (or your fav penetrating fluid) for a few days as a start. Then remove the coupling bolts and get the engine out of the way. As its a 2GM it shouldn't be hard to lift out of the way.

Once the engine is out you need a few tools to remove the coupling from the shaft. remove alll the bolts, setscrews etc on the shaft coupling.
1. MAPP gas torch
2. thick piece of steel (3/8") slightly bigger than the diameter of the coupling with 4 holes to match the bolt holes in the coupling
3. pieces of all thread to go into those holes and enough nuts to have 2 locked together on one end of each all-thread.
4. a socket with an outer diameter slightly under that of the shaft.

Assemble the steel plate with the allthread on the coupling. put the socket on the end of the shaft inside the coupling. Now tighen it up as much as you dare.

Take the torch and heat the coupling for a good long time (without burning down the boat!)

tigthen the bolts on the presser that you made above. Repeat. Heat, tighten, heat, tighten. Eventually the coupling will move.

Patience is key here
pcmm is offline   Reply With Quote
Old 14-05-2024, 06:48   #11
Registered User
 
NYSail's Avatar

Join Date: Jan 2012
Location: Long Island, New York
Boat: Beneteau 423 43 feet
Posts: 863
Re: Should I cut this shaft?

Quote:
Originally Posted by NYSail View Post
My last boats coupling was that badů.. I k it the shaft side of the coupling then cleaned the transmission side. Had the shaft and prop serviced and they put on a new shaft side coupling.

Greg
Woops....... I cut the shaft side of the coupling. It was so corroded nothing else would work in my case.
NYSail is offline   Reply With Quote
Old 15-05-2024, 10:42   #12
Registered User

Join Date: Mar 2016
Location: North of San Francisco, Bodega Bay
Boat: 44' Custom Aluminum Cutter, & Pearson 30
Posts: 677
Re: Should I cut this shaft?

Pull the engine, remove the prop and then pull the shaft out forward. Then you can put it in a vice to work on it not bent over in a tight hole. Or bring it to a shop with a press. The 2gm is easy to move around if you set a few 2x4s under it to slide it forward.
NorthCoastJoe is offline   Reply With Quote
Old 15-05-2024, 10:48   #13
Marine Service Provider

Join Date: Jun 2015
Location: Croatia
Boat: Elan 45 impression
Posts: 1,284
Re: Should I cut this shaft?

cut bolt head boath side with angel grinder.
and try pull rest bolt
later try hammer and rust remover couple time, later penetration oil and hammer again
more is offline   Reply With Quote
Old 24-05-2024, 06:38   #14
Registered User
 
Tanqueray's Avatar

Join Date: Dec 2011
Location: Indiana
Boat: O'Day 322
Posts: 146
Re: Should I cut this shaft?

I think you should plan on replacing the shaft, coupling and strut bearing all at the same time (and consider a Volvo Penta rubber shaft seal).

I worked for a few days to press the shaft out of my coupling (and my coupling un-bolted fairly easily). You are in for a battle trying to get yours apartůand then you will probably find wear, cracks and other issues with the shaft.

After getting mine out, I replaced it.

https://youtu.be/4RlzgOOXhhQ?si=7nbVlp-segM65rZ6

https://youtu.be/FUjoyKfNZ_U?si=yAMQN_LfxCmhvOZG

https://youtu.be/0tHXzKb4liA?si=gWuy-CdWEaQHKjmM


Good luck,

Greg
Tanqueray is offline   Reply With Quote
Old 24-05-2024, 07:35   #15
Registered User
 
OS2Dude's Avatar

Join Date: Nov 2014
Location: Atlanta, GA
Boat: Catalina 30
Posts: 678
Images: 5
Re: Should I cut this shaft?

That coupler is in bad shape. As others have said, try grinding the bolt heads/nuts off and see if you can separate it. If your transmission is like the one on my Universal M25, the transmission flange is integral to the transmission and if it is bent or damaged you may be looking at a new transmission as well. Also be careful of using penetrating oils like PB Blaster as they can damage the seals in the transmission. Spray it into the cap and apply with small brush or cotton swaps.

For as rusty as the coupler is, I'd think about getting a new one. The connection between the coupler and the shaft is supposed to be an 'interference' fit and if the rust has gotten between the shaft and coupler, it won't be anymore. If you can get the shaft and coupler out of the boat, take it to a machine shop and see if they can use a press to push the shaft out. You may be able to keep the shaft, but shaft & coupler usually need to be machined together to achieve the desired 'interference' fit.

I had to cut mine two years ago because I could not get the shaft out of the coupler. I bought a new coupler and stainless shaft pre-machined.
OS2Dude is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fiberglass tank refit - should I cut it open? leveche420 Construction, Maintenance & Refit 35 26-01-2019 17:33
Cut/drill hole for prop shaft? andreas.mehlin Engines and Propulsion Systems 2 19-07-2018 02:59
To Cut or Not to Cut - Underseat Cabinets Jetexas Monohull Sailboats 9 25-02-2012 19:06
Diesel Weeping Oil from Cut-Off Shaft duefocena Engines and Propulsion Systems 7 12-09-2011 19:45
Where should I cut the hull timber ? Dave-Fethiye Construction, Maintenance & Refit 17 15-06-2007 12:29

Advertise Here


All times are GMT -7. The time now is 17:09.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.