Shaft coupling removal and reinstallation - Page 3 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 


Like Tree2Likes
Reply
 
LinkBack Thread Tools
  #21  
Old 03-01-2012
Well-wisher
 
Join Date: Sep 2005
Posts: 75
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
pschoonveld is on a distinguished road
I did this same project with my Tartan 34 over Christmas.

I recommend cutting the coupling. I used a 4" angle grinder and a Bosch oscillating tool to cut through the coupling on top of the keyway and then 180 degrees on the other side. It was messy, but way better than messing with heat and cold approaches for the reasons you noted. I also didn't put a scratch on the shaft. Had it not been for the scoring I found at the stuffing box, I would have easily been able to reuse the shaft. The whole thing took 45 min, tops.

Next, check the clearance between the dripless/stuffing box of your choice and the coupling. If you have an inch to spare, your next coupling could be a split coupling. The advantage is you don't press the shaft onto the coupling. Instead, the coupling has a slot that closes when you bolt it down. The downside is the coupling is about an inch longer.

Should you not have the space for a split coupling, make sure you have a small sledge to seat the shaft onto the coupling. I ended up using a scrap piece of 3" drive shaft to wail it into place. Every time you hit the shaft, the engine moves forward on the mounts and it takes forever. Not a fun project, but it's the only option unless you hoist the engine and slide the pressed coupling/shaft combo back through the packing and stern tube.

While you're in the neighborhood, have a look at your cutlass bearing and strut. A bearing is only $20 and the easiest time to replace it is when the shaft is out. If your strut needs rebedding, as mine did, it's a good time to get it taken care of. On many boats, mine included, the rudder is in the way of removing the shaft and dropping the strut was the only way to get the shaft out, short of hoisting the engine or dropping the rudder.

Finally, if you haven't had enough good advice from your friends yet, consider having a prop shop balance your prop. Mine had significant differences in pitch and diameter. Friends who've had it done say it made a huge difference in vibration and the cost for a 2 blade is only $200-ish.

Have fun...
Reply With Quote Quick reply to this message Share with Facebook
  #22  
Old 03-08-2012
Skipaway's Avatar
Member
 
Join Date: Jun 2008
Location: Pacific Northwest
Posts: 82
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
Skipaway is on a distinguished road
Re: Shaft coupling removal and reinstallation

pschoonveld writes:
>Next, check the clearance between the dripless/stuffing box of your choice and the coupling. If you have an inch to spare, your next coupling could be a split coupling. The advantage is you don't press the shaft onto the coupling. Instead, the coupling has a slot that closes when you bolt it down. The downside is the coupling is about an inch longer.

Downeast: a split coupling was recommended to me by prop shop that mostly works on fishing boats. Makes sense, except I wonder about balance. Other with experience or comments?

Also wondering what necessitated this work? (I have similar work coming up. the flange key sheared on mine, plus strut need re-bedding.)
__________________
Charlie Lincoln • Cathlamet, WA • Islander 28 #108

Last edited by Skipaway; 03-08-2012 at 01:05 AM. Reason: fingers to quick
Reply With Quote Quick reply to this message Share with Facebook
  #23  
Old 03-08-2012
Maine Sail's Avatar
Senior Member
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,472
Thanks: 12
Thanked 137 Times in 105 Posts
Rep Power: 15
Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice Maine Sail is just really nice
Re: Shaft coupling removal and reinstallation

Quote:
Originally Posted by Skipaway View Post
pschoonveld writes:
>Next, check the clearance between the dripless/stuffing box of your choice and the coupling. If you have an inch to spare, your next coupling could be a split coupling. The advantage is you don't press the shaft onto the coupling. Instead, the coupling has a slot that closes when you bolt it down. The downside is the coupling is about an inch longer.

Downeast: a split coupling was recommended to me by prop shop that mostly works on fishing boats. Makes sense, except I wonder about balance. Other with experience or comments?

Also wondering what necessitated this work? (I have similar work coming up. the flange key sheared on mine, plus strut need re-bedding.)

Split couplings do not need to be "longer". Buck Algonquin makes one for many engines that is actually shorter and I install a bunch of them. Still need a fit & face but easier install....


This one is for a 1" shaft and a Hurth HBW box..


__________________
______
-Maine Sail / CS-36T


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.




© Images In Posts Property of Compass Marine Inc.



Last edited by Maine Sail; 03-08-2012 at 07:10 AM.
Reply With Quote Quick reply to this message Share with Facebook
  #24  
Old 03-08-2012
downeast450's Avatar
Tundra Down
 
Join Date: Jan 2008
Location: Seal Harbor, Maine
Posts: 1,237
Thanks: 27
Thanked 17 Times in 17 Posts
Rep Power: 7
downeast450 is on a distinguished road
Re: Shaft coupling removal and reinstallation

Charlie,

I am removing the shaft to replace an aging cutlass bearing before it causes any problems and to renew the stuffing box coupling hose. Both came with the boat. I don't plan to change to a dripless connection.

Down
Reply With Quote Quick reply to this message Share with Facebook
  #25  
Old 03-08-2012
downeast450's Avatar
Tundra Down
 
Join Date: Jan 2008
Location: Seal Harbor, Maine
Posts: 1,237
Thanks: 27
Thanked 17 Times in 17 Posts
Rep Power: 7
downeast450 is on a distinguished road
Re: Shaft coupling removal and reinstallation

This looks like a good solution to the new coupling from Moyer Marine.

(OREV_14.0_540) Direct drive prop shaft coupling, with split hub (3/4 inch)

The split hub design insures a tight fit between the coupling and prop shaft as well as facilitating removal of the coupling in the future.

Direct drive prop shaft coupling, with split hub (3/4 inch)
Price: $175.00

Any one used one of these?

Down
Reply With Quote Quick reply to this message Share with Facebook
  #26  
Old 03-09-2012
Banned
 
Join Date: Jan 2012
Location: British Columbia
Posts: 2,373
Thanks: 19
Thanked 33 Times in 32 Posts
Rep Power: 0
Brent Swain is on a distinguished road
Re: Shaft coupling removal and reinstallation

Don't rely on a grub screw with an indentation in the shaft to stop the shaft from pulling out of the coupling when reversing. I've seen them do that, and come close to sinking the boat, several times. I use a 5/16th bolt right thru the coupling and shaft. On split couplings, the bolts score the shaft by about half the diameter of the bolt.
Reply With Quote Quick reply to this message Share with Facebook
  #27  
Old 03-09-2012
SloopJonB's Avatar
Senior Moment Member
 
Join Date: Jun 2011
Location: West Vancouver B.C.
Posts: 10,889
Thanks: 58
Thanked 55 Times in 52 Posts
Rep Power: 4
SloopJonB will become famous soon enough
Re: Shaft coupling removal and reinstallation

Quote:
Originally Posted by Brent Swain View Post
Don't rely on a grub screw with an indentation in the shaft to stop the shaft from pulling out of the coupling when reversing. I've seen them do that, and come close to sinking the boat, several times. I use a 5/16th bolt right thru the coupling and shaft. On split couplings, the bolts score the shaft by about half the diameter of the bolt.
Another of God's cosmic jokes. If you WANT to remove your coupling, good luck - heat, large hammers, powerful cutters etc. will be required.

If, on the other hand, you DON'T want it to separate, merely putting it in reverse is very possibly all that will be required.

Brent, re: your reference to running a bolt all the way through - could you just drill & tap part way into the shaft or would that cause balance problems? Also, I don't understand your last sentence - "score the shaft...." Can you elaborate?
__________________
I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.
Reply With Quote Quick reply to this message Share with Facebook
  #28  
Old 03-09-2012
Well-wisher
 
Join Date: Sep 2005
Posts: 75
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
pschoonveld is on a distinguished road
Re: Shaft coupling removal and reinstallation

Quote:
Originally Posted by Maine Sail View Post
Split couplings do not need to be "longer". Buck Algonquin makes one for many engines that is actually shorter and I install a bunch of them. Still need a fit & face but easier install....
I really wish I had known about the split coupling with a shorter length. I can't stress enough how much easier this would have made the install.
Reply With Quote Quick reply to this message Share with Facebook
  #29  
Old 03-10-2012
Banned
 
Join Date: Jan 2012
Location: British Columbia
Posts: 2,373
Thanks: 19
Thanked 33 Times in 32 Posts
Rep Power: 0
Brent Swain is on a distinguished road
Re: Shaft coupling removal and reinstallation

The solid coupling is put on and the holes are drilled so half the hole is in the side of the shaft.
Reply With Quote Quick reply to this message Share with Facebook
  #30  
Old 03-10-2012
Skipaway's Avatar
Member
 
Join Date: Jun 2008
Location: Pacific Northwest
Posts: 82
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
Skipaway is on a distinguished road
Re: Shaft coupling removal and reinstallation

Quote:
Originally Posted by downeast450 View Post
Charlie,

I am removing the shaft to replace an aging cutlass bearing before it causes any problems and to renew the stuffing box coupling hose. Both came with the boat. I don't plan to change to a dripless connection.

Down
I’m doing all that + more; also plan to stick with conventional stuffing. Interesting that you have a 3/4” shaft; mine is 1/2”, so fewer options. I don’t have much to offer, so I’ll follow the thread so as not to hijack.
__________________
Charlie Lincoln • Cathlamet, WA • Islander 28 #108
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
shaft\coupling tolerance drobarge Gear & Maintenance 7 06-30-2011 06:42 PM
flex coupling/propshaft removal help? MitchM Gear & Maintenance 2 05-08-2011 04:32 AM
Flexible shaft coupling zerubb Gear & Maintenance 1 08-19-2006 12:13 AM
shaft coupling clifsail Announcements and Suggestions Box 1 08-15-2006 03:06 PM
prop shaft coupling kurt crowley Atomic 4 2 06-27-2006 04:45 PM


All times are GMT -4. The time now is 09:22 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.