Prop shaft strut repair - SailNet Community
 4Likes
Reply
 
LinkBack Thread Tools
post #1 of 23 Old 11-18-2013 Thread Starter
Senior Member
 
Join Date: Jul 2002
Location: Rhode island
Posts: 168
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 14
 
Prop shaft strut repair

Ok guys, I have quite a repair ahead of me. Without posting on the PO thread it's apparent that the PO wrapped a line around the prop and bent the strut. I just bought the boat and yes the survey reveled this problem. The strut is bonded into the hull and does not have a flange.
My three choices for the repair are;
1) buy a new "close fitting" strut from Bock Algonguin, $ 600.+
2) cut existing strut out and weld/braze on a flange (bronze)
3) fab a new strut out of stainless

I have access to a full on machine shop and can do most of the work myself, zero boat $

All three options involve cutting the existing strut out and realigning the whole drive train. When I think of the things I can buy w/$600 options 2,3 are my preferred methods. So the question becomes what's wrong with fabbing a new strut out of stainless and/or would the welding/brazed method be strong enough?

John
jfdubu is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 23 Old 11-18-2013
me at 67!
 
deniseO30's Avatar
 
Join Date: Nov 2006
Location: Bristol pa
Posts: 6,925
Thanks: 55
Thanked 125 Times in 114 Posts
Rep Power: 10
   
Re: Prop shaft strut repair

what boat, size, engine and shaft size may help those trying to help you.... Many struts are "glassed in" so the flange isn't showing. Often, the fuel tank is over the "bump" where the strut would be located in the back bilge area. even the bolt "bumps" show on some boats.
Don't know how you found a new one at such a high price.. unless it's a very large boat.

Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


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

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


My boat is sold!
deniseO30 is offline  
Quote Quick Reply Share with Facebook
post #3 of 23 Old 11-18-2013
Senior Member
 
overbored's Avatar
 
Join Date: Oct 2010
Location: Dana Point, Ca
Posts: 1,192
Thanks: 1
Thanked 62 Times in 62 Posts
Rep Power: 5
 
Re: Prop shaft strut repair

Stainless is not good below the waterline. why do you need a flange. there are struts that are straight on the end and are glassed into the boat. the glass in one are cheaper

"FULL TILT II" 2011 BENETEAU FIRST 30
"FULL TILT" SOVEREL 33
"GOLD RUSH" PRINDLE 16
overbored is offline  
Quote Quick Reply Share with Facebook
post #4 of 23 Old 11-18-2013 Thread Starter
Senior Member
 
Join Date: Jul 2002
Location: Rhode island
Posts: 168
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 14
 
Re: Prop shaft strut repair

The boat is an express 35, yanmar 3gm, 27hp, 1" shaft. The strut is a straight tang glassed in. It's loose at the hull join and leaks, neither of which is acceptable.
I could cut it all out and start fresh but I really don't want that "hole" in the boat.
Once I do start cutting my plans may change. I have great access to both sides of the hull. Nothing in the way on the inside.
The price was as quoted by Buck Algongin. I was shocked too, and the part does not really fit. More mod's would take place.
jfdubu is offline  
Quote Quick Reply Share with Facebook
post #5 of 23 Old 11-18-2013
Senior Member
 
Markwesti's Avatar
 
Join Date: Dec 2012
Location: so cal
Posts: 680
Thanks: 94
Thanked 31 Times in 31 Posts
Rep Power: 3
 
Re: Prop shaft strut repair

Ditto on no SS below water .
Markwesti is offline  
Quote Quick Reply Share with Facebook
post #6 of 23 Old 11-18-2013
Senior Member
 
SchockT's Avatar
 
Join Date: May 2012
Location: North Vancouver, BC
Posts: 1,431
Thanks: 1
Thanked 27 Times in 25 Posts
Rep Power: 4
 
Re: Prop shaft strut repair

If I am understanding you correctly the strut is bent, AND it's fibreglass bond to the hull is broken. If that is the case then you will need to grind away the damaged glass and remove the strut. From there you can assess how badly bent it is, but there is a good chance you can straighten it with a hydraulic press while it is off the boat. Then it is just a case of reinstalling it the same way the manufacturer did, and glassing it in again. There is a reason they use bronze instead of stainless, and there is a reason they glass it into the hull. Why try to reengineer the boat?
rikhall likes this.

1979 Santana 30 Tall Rig
Hull#101
SchockT is offline  
Quote Quick Reply Share with Facebook
post #7 of 23 Old 11-18-2013
me at 67!
 
deniseO30's Avatar
 
Join Date: Nov 2006
Location: Bristol pa
Posts: 6,925
Thanks: 55
Thanked 125 Times in 114 Posts
Rep Power: 10
   
Re: Prop shaft strut repair

Quote:
Originally Posted by jfdubu View Post
The boat is an express 35, yanmar 3gm, 27hp, 1" shaft. The strut is a straight tang glassed in. It's loose at the hull join and leaks, neither of which is acceptable.
I could cut it all out and start fresh but I really don't want that "hole" in the boat.
Once I do start cutting my plans may change. I have great access to both sides of the hull. Nothing in the way on the inside.
The price was as quoted by Buck Algongin. I was shocked too, and the part does not really fit. More mod's would take place.
You still have to dig out the old one. Very very good chance you will find a flange in there. I've seen this done a few times by DIY friends in my YC. with all due respect you are over thinking this project. Pulling the prop will maybe be the most difficult part of the job.

I know you don't want to do a "repair" that looks like this.

Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


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

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


My boat is sold!

Last edited by deniseO30; 11-18-2013 at 09:10 PM.
deniseO30 is offline  
Quote Quick Reply Share with Facebook
post #8 of 23 Old 11-18-2013
Jnoiur Mebemr
 
StormBay's Avatar
 
Join Date: Sep 2010
Location: Bahamas
Posts: 180
Thanks: 1
Thanked 10 Times in 9 Posts
Rep Power: 5
 
Re: Prop shaft strut repair

At $600 for "close" it may be better to have a new one cast. Thats what we just did. It came out to be closer to $700 with a new bearing included but ours is massive and weighs 50+ lbs (so at $4 a lb, thats $200 in bronze alone)

Yu & Frank

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
StormBay is offline  
Quote Quick Reply Share with Facebook
post #9 of 23 Old 11-18-2013
Just another Moderator
 
Faster's Avatar
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 16,534
Thanks: 104
Thanked 312 Times in 300 Posts
Rep Power: 10
     
Re: Prop shaft strut repair

This is a pretty critical piece that you'll want to do more than 'make it work'.. and if you can get it done for under a boat buck that's relatively inexpensive peace of mind for the future. But it doesn't sound like your $600 'close enough' is the best plan either..

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)
Faster is offline  
Quote Quick Reply Share with Facebook
post #10 of 23 Old 11-18-2013 Thread Starter
Senior Member
 
Join Date: Jul 2002
Location: Rhode island
Posts: 168
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 14
 
Re: Prop shaft strut repair

To be clear, engineering things is what I do for a living, reengineering a boat is not a big deal. I'm not looking for the path of least resistance. This is a "I only want to fix this once" quest. Where my experience lacks is the strength of brazed bronze. There is a 6"x6"x8" box inside the hull that houses the broken strut-hull bond, no flange
jfdubu 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
Prop shaft strut replacement SlowButSteady Gear & Maintenance 6 08-29-2013 05:11 PM
Shaft Strut sailorboy2 Gear & Maintenance 4 12-13-2010 08:30 AM
CS36T Loose Prop Shaft Strut imckinnon CS Yachts 0 05-17-2009 11:41 AM
Painting shaft strut sail268 Gear & Maintenance 2 03-27-2007 10:00 PM
Where to get a prop shaft and strut?? john232 Gear & Maintenance 4 01-06-2004 10:26 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