Reply
 
Thread Tools Search this Thread
 
Old 05 September 2013, 17:24   #1
Member
 
Country: UK - England
Boat name: ....
Length: no boat
Engine: Mercury 15hp
Join Date: Feb 2013
Posts: 96
Broken Stainless Bolt Removal ??

Hi guys, have 2 broken stainless steel bolts here that need removed from the aluminium casing.

1 bolt has some thread left on it ( a notch has been cut into the end of it for a screwdriver but part of it has broken off making the screwdriver method pretty useless )

The other bolt was drilled and a bolt extractor used which then snapped and is now stuck inside the bolt.

How can i remove these 2 bolts ??

Drill the extractor out with a tungsten or cobalt bit and use another bolt extractor or... ?

How is best to remove these without damaging the aluminium casing ?

The bolts are 6mm

Any help would be greatly appreciated !
Attached Thumbnails
Click image for larger version

Name:	05092013623.jpg
Views:	199
Size:	135.1 KB
ID:	85062   Click image for larger version

Name:	04092013622.jpg
Views:	209
Size:	175.9 KB
ID:	85063  
__________________

__________________
HighlandR is offline   Reply With Quote
Old 05 September 2013, 17:41   #2
Member
 
Country: UK - England
Town: Liverpool
Length: 6m +
Join Date: Jun 2013
Posts: 153
The one without a stud extractor will drill out but stainless is never easy.

Stud extractors are a pig to drill

Do you have a local engineer who can spark erode them out?

You might find the threads are a mess regardless of how you get them out so might need an insert or similar pitting in.

Sent from my iPhone using Rib.net
__________________

__________________
SparkUK is offline   Reply With Quote
Old 05 September 2013, 17:45   #3
Member
 
Country: USA
Town: CA
Make: Zodiac RIB-P
Length: 7m +
Engine: Suzuki 250
Join Date: Aug 2010
Posts: 1,122
Throw it out and buy a new one!!

Seriously all my home attempts with the same thing ended badly same as you. A machinist I used removed some busted screws for me by TIG welding a bead on to the end of them The bead gives you something to grab on to and the heat makes the aluminum expand more than the stainless so it helps break them free. Know any good machinists or welders?
__________________
Bigtalljv is offline   Reply With Quote
Old 05 September 2013, 18:40   #4
Member
 
Country: UK - England
Town: Leicester
Length: 5m +
Engine: 135hp Mercury
Join Date: Sep 2013
Posts: 707
Removed 4 from the bottom leg of mine. Very careful drilling down the center of the remains using progressively bigger bits then a grinding bit on a die grinder. Still finished up heli-coiling them.
Welding onto the stubs didn't help, they just sheared off flush. Bit of a surprise as that's worked for me in the past.
__________________
paintman is offline   Reply With Quote
Old 05 September 2013, 19:02   #5
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
This thread should be a sticky to stop people trying to use easy-outs.


The one with the broken extractor is NOT going to come out without drilling. Period. It's expanded the bolt into it, so it's now more stuck than it was.You're probably best to try drilling it out on a pillar drill, VERY slowly with a decent drill bit and lots of lube

The other one you might find a shedload of blowtorch heating/cooling/plusgas cycles might free it enough to get it out with molegrips.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 05 September 2013, 20:08   #6
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Easy-outs are the work of the devil.
__________________
Downhilldai is offline   Reply With Quote
Old 05 September 2013, 20:10   #7
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Always helps to give the bolt a bit of a touch with a hammer before trying to unscrew it from aluminium. This will hopefully free off the corrosive bond that forms between the ally and the steel/stainless bolt.
__________________
Downhilldai is offline   Reply With Quote
Old 05 September 2013, 20:11   #8
Member
 
Country: UK - England
Town: Royal Wootton Bassett
Length: 8m +
Engine: 250
Join Date: Jul 2008
Posts: 8,020
So how do the pro's do it? A bit of heat too?
__________________
whisper is offline   Reply With Quote
Old 05 September 2013, 20:15   #9
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Oi, don't you believe what NoS & I are saying?
__________________
Downhilldai is offline   Reply With Quote
Old 05 September 2013, 20:18   #10
Member
 
Country: UK - England
Town: Royal Wootton Bassett
Length: 8m +
Engine: 250
Join Date: Jul 2008
Posts: 8,020
No I was just asking how they do it in the trade

I've seen Nos in action with a broken bolt removal, very impressive
__________________

__________________
whisper is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 19:51.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.