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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8021

 2011 Defender 110 Puma 2.4 USW Stornoway Grey
heat Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #619867 27th Apr 2017 9:17am
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

United Kingdom 
Pilgrimmick wrote:
Is it an ex-military bumper?

No, it's a civilian copy and so lacks all of the unnecessary holes and came pre-drilled for the rubber end caps. I didn't realise that sorting the pin out would be such a pain though.


Click image to enlarge


Further developments this evening. After having it sit in the freezer overnight, I took a punch and a lump hammer to it and did manage to move the broken bit slightly. Then broke my punch Rolling Eyes

I haven't got anything else to hand that is both hard enough to drive the bit out and only 2mm diameter and I can't find my blowtorch, which I haven't used for probably ten years, so I'm going to admit defeat and just buy another pin. Fortunately, they're not very expensive.

Thanks for all of the suggestions, though. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #620023 27th Apr 2017 9:03pm
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shaggydog



Member Since: 12 Aug 2012
Location: Kent
Posts: 3347

United Kingdom 1991 Defender 110 200 Tdi USW Arles Blue
Have you tried Blanchard's?

https://www.pablanchard.co.uk/

I would be surprised if they don't have one! Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197

Self confessed mileage hunter Very Happy
Post #620146 28th Apr 2017 12:15pm
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X4SKP



Member Since: 29 Nov 2013
Location: Berkshire
Posts: 2295

United Kingdom 2010 Defender 90 Puma 2.4 SW Stornoway Grey
blackwolf wrote:
Several options:
1. Get a new pin, ideally of the right length!
2. Find someone with a spark erosion machine.
3. Using a pointed punch at the bottom of the 6mm hole, belt the bejasus out of it in the hope of bursting through and knocking the fragment out.
4. Heat the pin with oxy acetylene or oxy propane gear in the hope of expanding it enough to free off the fragment.


blackwolf has it right...i'd just change the order of attack...

4 Heat this up and be done with it
3 Then hit it when hot (if it doesn't fall out)
2 Will defiantly work (if you have time)
1 Just isn't a Defender Owners MO...

Good Luck... Thumbs Up SKIP
https://www.defender2.net/forum/topic83242.html
Post #620158 28th Apr 2017 1:17pm
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gilarion



Member Since: 05 Dec 2013
Location: Wales
Posts: 5110

Wales 2007 Defender 90 Other CSW Trident Green
Have you tried using a Blacksmiths drill bit they are better quality then most jobber drill bits and as sharp as anything. Tool Station sells them at really cheap prices. I have drilled through hardened steel with one of these drill bits.

http://www.toolstation.com/search?searchst...36%2084868 For those who like Welsh Mountains and narrow boats have a look at my videos and photos at..

http://www.youtube.com/user/conwy1
Post #620163 28th Apr 2017 1:40pm
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

United Kingdom 
Thanks for the idea but those drill bits are more expensive than a new pin (allowing for delivery) and are much bigger than the hole I'm trying to drill.

shaggydog wrote:
Have you tried Blanchard's?

I had a look but their pins are about three times the cost and I'm not convinced they'd fit. As my bumper is a civilian copy, I suspect it's been made slightly differently which means that a slightly longer than normal pin is needed.


X4SKP wrote:
blackwolf has it right...i'd just change the order of attack...

I've no reason to doubt Mr Blackwolfs suggestions. It's just become a trade off between buying more stuff to fix the problem and buying a new pin. I've gone for the latter, which should be with me tomorrow, as I need to use it over the weekend.

If necessary, I'll just use a pin at the length it comes, but with a bit more care with the drilling, I'm sure I can get it right second time around. I'll post pics Thumbs Up Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #620165 28th Apr 2017 2:15pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17372

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Use a bigger drill for the pilot hole next time. 2mm is too small for a 1" deep pilot hole in a mild steel pin. I'd use a minimum of 4mm or 5mm.
Post #620196 28th Apr 2017 4:46pm
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sako243



Member Since: 08 Jul 2014
Location: Wales
Posts: 1218

Wales 1994 Defender 110 300 Tdi CSW Alpine White
You need it shortened? Can that shortening happen at the 2mm hole end?

If so bring it to the next Sy4x4 meeting (or if you're passing Tongham) this weekend and I can chuck it on the lathe and put some carbide to it. That'll get through it.

A bit in hindsight but if it's a small drill bit you'll want the pillar drill to be on a fast setting otherwise you'll risk the bit biting and exactly this happening. I've got some pretty decent quality Presta drill bits and even managed to snap the 8mm bits because they're so damn sharp. Better off running fast and with coolant (not oil). Ed
82 Hotspur Sandringham 6x6
95 Defender 110 300Tdi
Post #620216 28th Apr 2017 5:42pm
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ppad



Member Since: 16 Nov 2012
Location: now, UK S Coast
Posts: 223

United Kingdom 2005 Defender 90 Td5 HT Caledonian Blue
Two ways to look at the problem Question

1) It's all great fun ...
I'm learning heaps about drills, metals, temperature, differential expansion (yes in theory the hole gets larger at the metal gets hotter SS expands at roughly 1.5 mm per m per 100 C, so I might expand the radius 1/10th mm if I can get it to 400+C) . I've even cleared out the shed and sorted it to look for a blow torch ...

2) My time is worth x quid per hour and is a very scarce resource.
Fixing the pin is costing n quid; getting a new one (n - heaps) quid, which I could spend on .. that nice green lane trip

Suggest solution 2 Rolling with laughter Sold the much modified 110 2.8, in Oz
Brought the 90 home from Switzerland ...
Post #620250 28th Apr 2017 7:44pm
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

United Kingdom 
Yeah, that's basically it. I'm very much a means to an end guy when it comes to this stuff Laughing

blackwolf wrote:
Use a bigger drill for the pilot hole next time. 2mm is too small for a 1" deep pilot hole in a mild steel pin. I'd use a minimum of 4mm or 5mm.

I realised my mistake the second it snapped Rolling Eyes I now know that trying to drill through 25mm of steel was just asking too much.


sako243 wrote:
You need it shortened? Can that shortening happen at the 2mm hole end?

If so bring it to the next Sy4x4 meeting (or if you're passing Tongham) this weekend and I can chuck it on the lathe and put some carbide to it. That'll get through it.

A bit in hindsight but if it's a small drill bit you'll want the pillar drill to be on a fast setting otherwise you'll risk the bit biting and exactly this happening. I've got some pretty decent quality Presta drill bits and even managed to snap the 8mm bits because they're so damn sharp. Better off running fast and with coolant (not oil).

Thanks for the offer but the hole I was drilling is within the intended finished length as it's for the lynch pin. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #620292 28th Apr 2017 10:33pm
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ppad



Member Since: 16 Nov 2012
Location: now, UK S Coast
Posts: 223

United Kingdom 2005 Defender 90 Td5 HT Caledonian Blue
Always liked the look of these central towing point, but in Oz I ended up with a tow ball one side bolted straight through to chassis and towing eye bolted to other chassis rail. Was never sure of the bumber strength.
This 'civilian' version, is it reinforced at the holes? If you recall your branch welding (B31.3 and branch reinforcement and all that) you need to be real careful of high stress points. The pin slides in the bumper, so can impose a point load of several Te at a single point on the bumper steel plate under shock load.
If not reinforced, I'd be tempted to take some thick and large washers and get them welded really neatly to upper and lower bumper steel and painted in to merge with bumper. Else, first time you pull a truck out of the mud you may, um, enlarge the sleeve in the bumper Whistle ? Sold the much modified 110 2.8, in Oz
Brought the 90 home from Switzerland ...
Post #620344 29th Apr 2017 11:15am
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

United Kingdom 
Problem solved Very Happy A slightly larger bit to start and a bit more care drilling out in stages and I've got a nice 6.5mm hole, bevelled on each side. Ten minutes with a hack saw lopped about an inch and a half off the end and then five minutes on the bench grinder saw the end shaped and polished.

I've also cut a rubber washer to sit under the top flange to stop it rattling against the bumper.

My failed first attempt is at the back:


Click image to enlarge


The bumper is, I think, a standard one that's been beefed up to support the tow hitch. The centre section between the chassis mounts is now box section and the holes where the pin pass through have had very thick washers welded top and bottom. It's bloomin' heavy and I'm happy that it's substantial enough for its' intended purpose. I think it's the latter that's caused me such a problem though, as those washers make it thicker than the working length of a standard 4 inch pin.


Click image to enlarge


Thanks for everyones' help and suggestions Thumbs Up Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #620435 29th Apr 2017 8:13pm
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JAY BOY



Member Since: 04 May 2010
Location: Not here
Posts: 1706

Wales 
Bow down Bow down

I wouldn't give up on the failed one. Drill 6.5mm from the good side find your blow torch. Knock the bit out.
Someone might steal the one on your car Whistle Whistle Rolling with laughter Rolling with laughter
Post #620440 29th Apr 2017 8:23pm
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

United Kingdom 
Heh, heh, rest assured it's not going to live on there permanently Laughing Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #620444 29th Apr 2017 8:42pm
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zsd-puma



Member Since: 09 Aug 2016
Location: Kent
Posts: 2720

United Kingdom 2010 Defender 110 Puma 2.4 USW Santorini Black
Post #621062 2nd May 2017 4:12pm
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