flex coupling/propshaft removal help? - 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? 
  #1  
Old 05-07-2011
Junior Member
 
Join Date: Feb 2008
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
MitchM is on a distinguished road
flex coupling/propshaft removal help?

can anyone with a centa or vetus flex coupling to your marine engine answer the following questions:

it appears that these flex couplings mount easily with 6 bolts onto the coupling in the gearbox (my engine = a yanmar 3JH4E 40 hp, for which there is an adapter flange)

1--in order to remove the prop shaft from the centa or vetus, do you just undo the 6 mounting bolts of the flex-coupler , which bolt heads s face aft in a circular arrangement ? and then start pulling the propeller shaft outboard and aft?

2--what bolts retain the prop shaft inside the flexible coupling ? those same 6 bolts, or some other set of bolts or fasteners that need to be loosened?i cannot understand how the force created by the fore and aft install directions of the 6 bolts convert to a clamping force , to keep the prop shaft engaged inside the flex coupling itself.

i need to replace a bent prop shaft and worn out cutless bearing . am having trouble getting the prop shaft out. i am not able to pull the prop shaft out rearward from the flex coupling even though i've already removed the 6 flex coupling bolts. (i have already removed the propeller and cutless bearing from the prop shaft....)

thanks in advance for as much detailed advice as you can supply...

on the hard, and going nowhere til i figure this one out...
__________________
Reply With Quote Share with Facebook
  #2  
Old 05-07-2011
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,930
Thanks: 75
Thanked 214 Times in 206 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Looks like a taper lock internally... check the graphics here: (Assuming this is a same/similar coupling)

centaflex

Also from their PDF catalog:

Quote:
• The coupling is fastened to the plain cylindrical propellor shaft by means of a securely dimensioned clamping hub, thus expensive machining of the propellor shaft is not nec- essary. Length adaption is simple, and there is no weak- ening of the propellor shaft diameter caused by a bore or keyway.
So it looks like you need to pry/back off the collar under the bolts once they are loose... this should release the tapered collar's "grip" on the shaft. (Qualifier... I've not done this, just going by the 'pictures'.....)
__________________
Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)

Last edited by Faster; 05-07-2011 at 02:07 PM.
Reply With Quote Share with Facebook
  #3  
Old 05-08-2011
centaursailor's Avatar
Senior in age only!!!
 
Join Date: Nov 2010
Location: Balbriggan
Posts: 554
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
centaursailor is on a distinguished road
Havn,t seen this particular arrangement either but have worked on plenty of gearbox drive shaft setups over the years.
Faster seems to have the right idea, but it often requires a sharp tap on the shaft end directed into the coupling to break the taper lock. If reusing the shaft use a copper or lead mallet.
If this doesn,t work a photo of the assembly would help.
Safe sailing.
__________________
The great appear great because you are on your knees. James Larkin, Irish Labour Movement.
Reply With Quote Share with Facebook
Reply


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
Here's a flex coupling by vetus. deniseO30 Gear & Maintenance 6 06-09-2009 10:20 AM
propshaft seals jjns Gear & Maintenance 10 05-07-2008 02:37 PM
propshaft removal patc Gear & Maintenance 5 03-10-2001 02:37 PM


All times are GMT -4. The time now is 09:46 PM.

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.