removing rusty coupler set screws - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 23 Old 01-20-2010 Thread Starter
Victoria28
 
Join Date: May 2008
Location: Victoria BC Canada
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
removing rusty coupler set screws

Hi, I have a '92 Catalina 28 - Universal M3-20 engine with Hurth HBW 50-2R transmission and what appears to be the original coupler. I need to remove this coupler and have purchased a new one from Catalina. The problem is getting the heavily rusted set screws to back out. I have carefully soaked all the bolts with a petroleum based penetrating oil. I have had success with loosening the 4 bolts that connect to the transmission, but the set screws are giving me a real fight!
After much scraping & brushing to remove as much of the rust as I have been able to so far it seems like the square heads are now a slightly smaller width than original. As you can see in the attached photo it looks like I'm going to destroy the head and/or break off the screw If I can't find a way to loosen them up.
So please any ideas - helpful hints?
Thanks, Bill
Attached Thumbnails
DSCF3911.jpg  
victoria28 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 23 Old 01-20-2010
Senior Member
 
Join Date: Jul 2008
Location: chesapeake bay
Posts: 1,942
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
pb blaster and heat. spray them down ( well use a small brush as pb will eat rubber ) and use a propane torch to heat the coupler up some, you dont need red hot just real warm. do this over several days, then try again. also tapping with a small hammer can also help get them loose, heck even trying to tighten them a little can help break them loose

if this does not work split the old one off. ie cut it with cutting wheels in a dremel or if you have the room a grinder. just cut until you are almost thru but not in to the shaft, then use a cold chisel to split it.
scottyt is offline  
Quote Quick Reply Share with Facebook
post #3 of 23 Old 01-20-2010
Tundra Down
 
downeast450's Avatar
 
Join Date: Jan 2008
Location: Seal Harbor, Maine
Posts: 1,274
Thanks: 50
Thanked 21 Times in 20 Posts
Rep Power: 8
 
Quote:
Originally Posted by scottyt View Post
pb blaster and heat. spray them down ( well use a small brush as pb will eat rubber ) and use a propane torch to heat the coupler up some, you dont need red hot just real warm. do this over several days, then try again. also tapping with a small hammer can also help get them loose, heck even trying to tighten them a little can help break them loose

if this does not work split the old one off. ie cut it with cutting wheels in a dremel or if you have the room a grinder. just cut until you are almost thru but not in to the shaft, then use a cold chisel to split it.
Amen!

PB, heat/tapping and patience will loosen almost anything.

Down
downeast450 is offline  
Quote Quick Reply Share with Facebook
post #4 of 23 Old 01-20-2010
Senior Member
 
Join Date: Nov 2008
Location: Long Island
Posts: 2,136
Thanks: 4
Thanked 0 Times in 0 Posts
Rep Power: 7
 
Also use a socket wrench, it will fit more surface. With worn down nuts, I sometimes manage with a slightly smaller socket.
WanderingStar is offline  
Quote Quick Reply Share with Facebook
post #5 of 23 Old 01-20-2010
TQA
Bombay Explorer 44
 
TQA's Avatar
 
Join Date: Apr 2009
Posts: 2,887
Thanks: 0
Thanked 77 Times in 73 Posts
Rep Power: 7
 
As a last resort make up some shields from sheet steel, old car bonnets are a good source, visit a junkyard and get the gas axe guy to come over with his kit and cut the sucker off. Some one who uses this kind of cutting equipement every day should cut it off with no damage to the shaft or other flange.

Mind you keep some fire supression gear to hand.
TQA is online now  
Quote Quick Reply Share with Facebook
post #6 of 23 Old 01-20-2010
Senior Member
 
BarryL's Avatar
 
Join Date: Aug 2003
Location: Long Island, NY
Posts: 1,792
Thanks: 4
Thanked 43 Times in 38 Posts
Rep Power: 12
 
How much time or money do you have?

Hey,

You can try the heat / soak / try / repeat method. Or you can give up and take out a saw. What condition is your prop shaft? If you suspect it is worn, then just get a good sawsall and start cutting. Cut the shaft. remove the 4 coupler bolts, and be done with it.

On the other hand, if you are short of funds and are fairly certain that the prop shaft is perfect, you can keep on trying to remove those bolts. Once you round the head your best bet will be a large vice grips and a mallet. Heat and oil will help.

Good luck,
Barry

Barry Lenoble
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
BarryL is offline  
Quote Quick Reply Share with Facebook
post #7 of 23 Old 01-20-2010
Senior Member
 
imagine2frolic's Avatar
 
Join Date: Aug 2008
Posts: 1,830
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 7
 
You can find a can of freezing spray in hardware places. That is one way, and the others are patience, and heat. If you do find someone to bring along a torch. Heating the area where the bolt is stuck is all that needed. I know I can cut away the bad piece from the shafdt, but the falling slag, spray, and excessive heat for a prolonged period of time is guaranteed grief. Fixing your problem has been my job for 33 years............i2f

20 MPH ain't fast unless, you do it in a 1000sq 3/2 house on 10foot waves
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


BORROWED, No single one of us is as smart as all of us!
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.
imagine2frolic is offline  
Quote Quick Reply Share with Facebook
post #8 of 23 Old 01-20-2010
Senior Member
 
tommays's Avatar
 
Join Date: Sep 2008
Posts: 4,296
Thanks: 1
Thanked 30 Times in 30 Posts
Rep Power: 7
 
I will NOT heat up things in the confines of cram packed motor area If soaking does not work as now you have flammable stuff sprayed on the part your trying to heat up

Its much better to drill out the screw and drill and split the coupling to remove it as its you should not really reuse it anyway

1970 Cal 29 Sea Fever

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

1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
tommays is offline  
Quote Quick Reply Share with Facebook
post #9 of 23 Old 01-20-2010
Senior Member
 
Sabreman's Avatar
 
Join Date: Sep 2006
Location: Yeocomico River, VA
Posts: 1,643
Thanks: 3
Thanked 18 Times in 15 Posts
Rep Power: 10
   
Here's another viewpoint.... you never replace the coupling without replacing the shaft along with it. The coupling and shaft MUST be machined together to ensure a snug fit. Otherwise, the vibration will shake everything loose. Thus, you can cut the shaft and unbolt the coupling from the engine in 15 minutes. Even if you get the nuts off, getting the steel coupling off the bronze shaft while still in the boat will be nearly impossible. Trust me, I've tried; those bolts are the least of your worries.

My recommendation is to replace the shaft and coupling together, the stuffing box (replace with a PSS seal), and cutlass bearing (why not?). I've done the job several times on various boats and it's quick and <$1000 if you do the work. I've posted the procedure several times on Sailnet.

Sabre 38 "Victoria"
Sabreman is offline  
Quote Quick Reply Share with Facebook
post #10 of 23 Old 01-23-2010 Thread Starter
Victoria28
 
Join Date: May 2008
Location: Victoria BC Canada
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
thanks for the advice from all of you- I have hauled the boat and separated the the shaft & coupler from the transmission - but the coupler with both set screws removed is still not loosening - tomorrow morning I'll try the trick of putting a socket on the end of the shaft and try to use it to push the shaft out by reclamping the coupler to the transmission plate with longer bolts - wish me luck! a good soaking with blaster may help too!
Cheers from sunny and mild Victoria,
Bill
victoria28 is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

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
The Salt's Corner Table smackdaddy General Discussion (sailing related) 129 06-18-2013 04:46 PM
Using the Asymmetrical Spinnaker Brian Hancock Gear and Maintenance Articles 0 08-30-2004 08:00 PM
Refining Your Downwind Sails Brian Hancock Gear and Maintenance Articles 0 04-06-2004 08:00 PM
Techniques for Removing Teak Decks Sue & Larry Buying a Boat Articles 0 11-24-2003 07:00 PM
Set and Drift Made Simple Jim Sexton Seamanship Articles 0 04-19-2000 08:00 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