Cruisers Forum

  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 13-02-2008, 10:46   #1
Registered User
markpj23's Avatar

Join Date: Nov 2005
Location: Black Hills, SD
Boat: Now Boatless
Posts: 1,152
Images: 47
Question Pull the Shaft or Not??

From my numerous posts on this by now folks know I had a shaft seal leak along with heavy black smoke. Shaft turns a little stiff by hand.

I just spoke with the local mechanic who has the hydraulic gear to press out the cutlas bearing and replace. He said - logically I think - that the shaft almost never gets bent in the middle, meaning between the strut and the stern tube. If it was a bent shaft it would likely be aft of the strut since the prop being grounded would exert its force back there. (I have not grounded aft by the way). The only other way it could be binding is if the strut itself was now misaligned. Mechanic says he'll be able to tell that also by the way the cutlas bearing rides on the shaft.

So we can measure shaft runout without removing it. I still plan to have the alignment checked / redone so that I'm confident we're still in spec. I don't see a need to replace the shaft seal at this point - it looks OK, but I did have that leakage problem.

If we pull the shaft I will take it to the local shop to check for trueness and polishing. Would still have to align whether I remove it or not.

So what do you think - pull the shaft completely or not? My inclination is to leave it in IF the runout checks good with it installed as-is.

markpj23 is offline   Reply With Quote
Old 13-02-2008, 11:02   #2
Marine Service Provider
Maine Sail's Avatar

Join Date: Jan 2007
Location: Maine
Boat: CS-36T - Cupecoy
Posts: 3,142
leave it..

Many, many times when you pull the shaft you break a layer of rust free on the inside of the coupling. This rust layer can be as much as tenths to hundredths of an inch thick and can make the fit of the coupling off when you re-install it.

I learned this the hard way. Unfortunately, it also took out my shaft too within an few hundred hours. If you pull the shaft my advice would be to have a NEW coupling fit and faced to the old shaft once you have had it tested for trueness. It's important to always have your coupling "faced" or at least checked for run out before re-installing it...
Marine How To Articles
Maine Sail is offline   Reply With Quote
Old 13-02-2008, 11:17   #3
Registered User
AnchorageGuy's Avatar

Join Date: Mar 2003
Location: Wherever the boat is!
Boat: Marine Trader 34DC
Posts: 4,619
mark, After this much time effort and expense the little it will cost to pull the shaft and have it checked at this point should not be that significant. Pull the shaft and have it checked if for no other reason than piece of mind. Even if it is not bent there is a real possibility that it may be scored and that can be a source of leaks and problems with the cutlass bearing and shaft seal.
Chesapeake Bay, ICW Hampton Roads To Key West, The Gulf Coast, The Bahamas

The Trawler Beach House
Voyages Of Sea Trek
AnchorageGuy is offline   Reply With Quote

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
Shaft Keeps Spinning Maddog Engines and Propulsion Systems 20 14-04-2010 16:10
shaft lock captden Construction, Maintenance & Refit 11 23-06-2007 14:47
Shaft Seal ?'S westykids Propellers & Drive Systems 14 26-03-2007 19:40
My Cadillac C/V shaft! irwinsailor Construction, Maintenance & Refit 7 14-10-2006 12:15

Advertise Here

All times are GMT -7. The time now is 04:09.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.