Propeller Shaft "Flaking" - SailNet Community
 
LinkBack Thread Tools
post #1 of 7 Old 08-01-2008 Thread Starter
Sailed it!
 
Join Date: Dec 2007
Location: Mandeville, LAf
Posts: 36
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Propeller Shaft "Flaking"

I had the boat hauled today for a bottom painting. While there I was told by the yard that the cutlass bearing was bad. He showed me this by shaking the prop shaft and said there was too much play. When he did this some of the prop shaft "flaked off" and revealed some of the shaft that was pink. He said that the zincs were gone and the shaft was compromised. He said that the shaft would likely break and fall off in time. To replace the cutlass bearing and shaft - $900-$1000. Is this reasonable? Has anyone ever seen a shaft in this condition? Oddly, the propeller was in excellent condition, no growth or damage.
tcase10 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 7 Old 08-01-2008
Senior Member
 
Join Date: Oct 2006
Location: Virginia
Posts: 725
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
I did mine myself. How long ago were the zinks last replaced? If it was recent find out why they are gone and fix it. Could be electrical leakage. You have a bigger problen than just the cutlass bearing. If you replace it and dont fix the problem you will be replacing it all over again.
badsanta is offline  
Quote Quick Reply Share with Facebook
post #3 of 7 Old 08-01-2008
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
If the shaft is bronze, and it is pinkish, it is likely a victim of galvanic corrosion of some sort. Don't know if the price is reasonable or not, as I don't have any specifics on the boat.

Sailingdog

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

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #4 of 7 Old 08-02-2008
Senior Member
 
sailboy21's Avatar
 
Join Date: Apr 2006
Location: SE Alaska
Posts: 722
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
 
Well... with the prices they are paying for metal at the scrap yards just make sure you get to keep anything they replace... Bronze shaft?
sailboy21 is offline  
Quote Quick Reply Share with Facebook
post #5 of 7 Old 08-02-2008
Senior Member
 
Join Date: Sep 2006
Location: Scotland
Posts: 2,364
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 9
 
Take a picture of it and post it here.
I think changing the cutlass bearing would be enough and you could easily do it yourself.
I have serious doubts that "He said that the shaft would likely break and fall off in time" is anyhting other than sharp practice, and poorly worded.
Rockter is offline  
Quote Quick Reply Share with Facebook
post #6 of 7 Old 08-02-2008
Senior Member
 
Join Date: Sep 2003
Posts: 268
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
 
Your costs for replacement, etc. sound correct, although you could DIY for less. As to whether you wish to replace the shaft, that's your call. Personally, I'd go stainless and find your galvanic corrosion problem. Me thinks your marina is the culprit. Hang a zinc off your battery's negative terminal over the side if you need more protection. You still need to find the cause.
sander06 is offline  
Quote Quick Reply Share with Facebook
post #7 of 7 Old 08-02-2008
I don't discuss my member
 
Fstbttms's Avatar
 
Join Date: Feb 2003
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 2,190
Thanks: 6
Thanked 26 Times in 26 Posts
Rep Power: 13
 
Your shaft has suffered dezincification due to electrolytic or galvanic corrosion. The pinkish color indicates that the zinc component of your bronze shaft has been depleted (this why we use sacrificial anodes) and the shaft material is now seriously weakened and brittle. If it's bad enough that metal is actually flaking off the shaft, I would replace the shaft.

This kind of damage is unlikely to occur in a short period of time. While it's possible there is some electrical problem that is the root cause of this (most likely to be aboard your own boat, rather than a neighbor's or the shorepower system), it sounds like the boat has been unprotected by zincs for quite a while. You absolutely need to make sure your zincs are replaced periodically.

Last edited by Fstbttms; 08-02-2008 at 12:26 PM.
Fstbttms is offline  
Quote Quick Reply 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:
OR

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
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Propeller shaft woes............. clayjay Gear & Maintenance 24 03-13-2008 08:17 PM
Uncovered my Newport 27 propeller shaft support, now what? ChicagoNewport27 Newport 2 04-22-2007 12:12 PM
Choosing the Right Propeller Sue & Larry Gear and Maintenance Articles 0 02-04-2003 07:00 PM
The Stuffing Box and Stern Tube Tom Wood Gear and Maintenance Articles 0 04-27-1999 08:00 PM
Check the Propeller Tom Wood Gear and Maintenance Articles 0 02-25-1999 07:00 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome