Sheared off nylon screw - 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 06-25-2012
captainrizzo's Avatar
Senior Member
 
Join Date: Feb 2008
Location: Baltimore, MD
Posts: 176
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
captainrizzo is on a distinguished road
Sheared off nylon screw

Part of my Furlex 100 maintenance regime requires that I remove a nylon screw on the lower bearing assembly, put grease in, and replace the screw. I do this twice per year. Yesterday, when I was putting the screw back in place, the head sheared off, and the screw is stuck, slightly recessed in the fitting. The good news is that the screw is stuck, so the opening is sealed. The bad news is that the screw is stuck!

The screw is small M6X10 and I don’t want to risk damaging the threads by using a drill and EZ Out tool. I am thinking that I can heat a jewelers screwdriver and melt a small slot, let it cool, and then back it out. Has anyone has ever tried this? If so, how much heat, etc.?

I don’t want to back the screw out until I have a replacement screw which should be in by Saturday. I will update how the project went upon completion, but meanwhile, I would like to get some feedback on my approach! Thanks in advance!
__________________
-Riz
2005 Catalina 350 Grazia

"If you want to build a ship, don't herd people together to collect wood. Just teach them to long for the endless immensity of the sea"
Antoine de Saint

My Blog:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #2  
Old 06-25-2012
Geoff54's Avatar
Senior Member
 
Join Date: Oct 2011
Posts: 690
Thanks: 0
Thanked 6 Times in 6 Posts
Rep Power: 3
Geoff54 is on a distinguished road
Re: Sheared off nylon screw

What you propose might work but the problem I see is that ,if it doesn’t, you will have to drill it and you now have a messed up area to try and center a very small drill bit. I would center punch/drill/extract - if you use a left hand drill bit and drill very slowly, you may not need the extractor, especially in something soft. I would have an M6 metal bolt and tap ready to check and clean up the threads if needed (a rough thread will chew up your nylon screw) and also a thread insert (helecoil/recoil/threadsert), just incase it gets messed up completely. If you need to tap it, after it has started, put grease on the tap to hold the swarf and wipe and replace it frequently. I’m guessing you already know all of this anyway but are looking for a better way – I'd just be concerned that it could create a worse problem. Good Luck.
Reply With Quote Share with Facebook
  #3  
Old 06-25-2012
Senior Member
 
Join Date: Sep 2006
Location: Texas
Posts: 526
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
CapnBilll is on a distinguished road
Re: Sheared off nylon screw

I remove sheared nylon screws all the time. Get a small flat head, (jewelers) slightly smaller than the screw diameter. Gently tap into the screw body. then gently rotate it out.

I would not use mineral grease on a nylon screw, as it will soften, and weaken the screw over time, as you just found out. Use a teflon, or other lubricant that doesn't contain solvents. What is the material the nylon screw is imbedded in? If it is metal or another hard substance, turning the drill bit by hand will remove the plastic with minimal damage to the threads.
__________________
The Sun has Risen on a New Day filled with the Promise of Adventure.
Reply With Quote Share with Facebook
  #4  
Old 06-25-2012
captainrizzo's Avatar
Senior Member
 
Join Date: Feb 2008
Location: Baltimore, MD
Posts: 176
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
captainrizzo is on a distinguished road
Re: Sheared off nylon screw

Quote:
Originally Posted by CapnBilll View Post
I remove sheared nylon screws all the time. Get a small flat head, (jewelers) slightly smaller than the screw diameter. Gently tap into the screw body. then gently rotate it out.

I would not use mineral grease on a nylon screw, as it will soften, and weaken the screw over time, as you just found out. Use a teflon, or other lubricant that doesn't contain solvents. What is the material the nylon screw is imbedded in? If it is metal or another hard substance, turning the drill bit by hand will remove the plastic with minimal damage to the threads.
Bill, thanks for your idea about gently tapping the jewelers screwdriver and turning a bit by hand. I only use Superlube synthetic grease with teflon for the fuller. I think the housing is metal, not sure what type though.
__________________
-Riz
2005 Catalina 350 Grazia

"If you want to build a ship, don't herd people together to collect wood. Just teach them to long for the endless immensity of the sea"
Antoine de Saint

My Blog:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #5  
Old 06-25-2012
TQA's Avatar
TQA TQA is offline
Bombay Explorer 44
 
Join Date: Apr 2009
Posts: 2,408
Thanks: 0
Thanked 31 Times in 27 Posts
Rep Power: 6
TQA is on a distinguished road
Re: Sheared off nylon screw

Used to deal with this all the time.

Take a screwdriver slightly smaller than screw diameter. Heat it up to more than boiling but less than red. Push it into the nylon. It will make a slot. Wait for a few seconds and unscrew it.

This almost always worked for me.
Reply With Quote Share with Facebook
  #6  
Old 06-25-2012
SVAuspicious's Avatar
Mermaid Hunter
 
Join Date: Oct 2006
Location: on the boat - Chesapeake
Posts: 2,900
Thanks: 0
Thanked 50 Times in 41 Posts
Rep Power: 8
SVAuspicious will become famous soon enough
Red face Re: Sheared off nylon screw

EZ Out. Replace with metal bolt and TefGel.
__________________
sail fast and eat well, dave
S/V Auspicious
AuspiciousWorks.com
beware "cut and paste" sailors.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #7  
Old 06-25-2012
SimonV's Avatar
Wish I never found SN!
 
Join Date: Jul 2006
Location: Brisbane Australia
Posts: 1,995
Thanks: 3
Thanked 4 Times in 4 Posts
Rep Power: 9
SimonV will become famous soon enough
Re: Sheared off nylon screw

Quote:
Originally Posted by TQA View Post
Used to deal with this all the time.

Take a screwdriver slightly smaller than screw diameter. Heat it up to more than boiling but less than red. Push it into the nylon. It will make a slot. Wait for a few seconds and unscrew it.

This almost always worked for me.
I second this but I heat the flat blade screw driver to a point that it melts the screw, push it in the pull it out making the slot, let cool then unscrew.
EDIT: OH I think I just said what TOA said but different.
__________________
Simon
Ericson 39B.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

I love my boat
S/V GOODONYA
Brisbane
present location Heading to the Whitesundays

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

DELIVERY SKIPPER
Drinking Rum before 10am makes you a Pirate NOT an alcohlic
Reply With Quote Share with Facebook
  #8  
Old 06-25-2012
captainrizzo's Avatar
Senior Member
 
Join Date: Feb 2008
Location: Baltimore, MD
Posts: 176
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
captainrizzo is on a distinguished road
Re: Sheared off nylon screw

Success!



I heated up a jewelers screwdriver with a Bic lighter, gave it a couple of taps with a small hammer and voilà! I put a M6X10 metalic screw in and will replace with a nylon screw when my order arrives! Thanks all for your suggestions!
__________________
-Riz
2005 Catalina 350 Grazia

"If you want to build a ship, don't herd people together to collect wood. Just teach them to long for the endless immensity of the sea"
Antoine de Saint

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

Last edited by captainrizzo; 06-25-2012 at 09:13 PM.
Reply With Quote Share with Facebook
  #9  
Old 06-26-2012
SVAuspicious's Avatar
Mermaid Hunter
 
Join Date: Oct 2006
Location: on the boat - Chesapeake
Posts: 2,900
Thanks: 0
Thanked 50 Times in 41 Posts
Rep Power: 8
SVAuspicious will become famous soon enough
Re: Sheared off nylon screw

Congrats.
__________________
sail fast and eat well, dave
S/V Auspicious
AuspiciousWorks.com
beware "cut and paste" sailors.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #10  
Old 06-26-2012
hellosailor's Avatar
Senior Member
 
Join Date: Apr 2006
Posts: 10,369
Thanks: 1
Thanked 72 Times in 70 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
Re: Sheared off nylon screw

rizzo-
fyi, nylon is attacked by petroleum-based lubricants. That and UV over the years might be why it broke. With the metal replacement, loctite or antiseize becomes mandatory, toss a coin for which you prefer but if that bolt is essential, you might want to use loctite and make sure you've got a spare.
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
Nylon Tie Downs - Dinghy sab30 Gear & Maintenance 11 10-08-2009 12:00 PM
3-Strand Polyester or Nylon trantor12020 Gear & Maintenance 21 01-28-2009 09:30 AM
nylon nuts and bolts grampian23 Gear & Maintenance 2 02-20-2004 04:48 PM
Nylon or Dacron ? Strega Gear & Maintenance 3 08-08-2003 09:03 AM


All times are GMT -4. The time now is 12:52 AM.

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