Pinch Bolt

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
Astrosquirrel
3rd Gear
Posts: 274
Joined: Thu Nov 07, 2013 7:03 pm

Re: Pinch Bolt

Post by Astrosquirrel » Wed Sep 28, 2022 8:46 pm

Watcha talking about. It's easy.

It only took me 3 whole days and half my life worth of patience and perseverance.... easy
IMG_20220928_202827.jpg
The benefits of not using / having the specialized tool :boohoo:

Astrosquirrel
3rd Gear
Posts: 274
Joined: Thu Nov 07, 2013 7:03 pm

Re: Pinch Bolt

Post by Astrosquirrel » Thu Sep 29, 2022 5:07 pm

I've just done the other side. The bolt was stuck way worse than the first one.

This time rather than faffing about with levers while impact gunning and such, I cut and reduced the bolt as close to the wall of the housing as possible, then I drilled a wedge at the center. Used the pointy bit of the air hammer, which pushed the bolt about a quarter of the way out, then the rest I handled it with levers, without rotating the bolt at all.

Total time: 2 1/2 hours

IMG_20220929_175719_1.jpg

As I have no special tools, this will be my procedure going fwd if the bolt is stuck :)

Mɐʇʇ
Cruising
Posts: 2680
Joined: Tue Oct 07, 2014 8:30 pm

Re: Pinch Bolt

Post by Mɐʇʇ » Thu Sep 29, 2022 7:32 pm

Could you explain “drilling a wedge at the centre” please?
"not a professional engineer, mechanic and mechanist"

Astrosquirrel
3rd Gear
Posts: 274
Joined: Thu Nov 07, 2013 7:03 pm

Re: Pinch Bolt

Post by Astrosquirrel » Thu Sep 29, 2022 7:36 pm

Mɐʇʇ wrote:
Thu Sep 29, 2022 7:32 pm
Could you explain “drilling a wedge at the centre” please?
My apologies, English isn't my first language and sometimes what I write is bo***cks. Here:
IMG_20220929_203348.jpg
Cheers :)

Mɐʇʇ
Cruising
Posts: 2680
Joined: Tue Oct 07, 2014 8:30 pm

Re: Pinch Bolt

Post by Mɐʇʇ » Thu Sep 29, 2022 7:47 pm

Ah. Got you. Thank you. I will do this myself .
"not a professional engineer, mechanic and mechanist"

Astrosquirrel
3rd Gear
Posts: 274
Joined: Thu Nov 07, 2013 7:03 pm

Re: Pinch Bolt

Post by Astrosquirrel » Thu Sep 29, 2022 7:49 pm

Alright good luck, hope it works out.

Mɐʇʇ
Cruising
Posts: 2680
Joined: Tue Oct 07, 2014 8:30 pm

Re: Pinch Bolt

Post by Mɐʇʇ » Tue Feb 21, 2023 6:12 pm

Success. I used just a little heat, combined with the air chisel with the Laser attachment in and both came out fairly easily.
(I'm very aware of the risks of overheating the ali - hence just enough heat to get it shifting with the air chisel, not more)

What worked for me:
* Nut loosened off until flush with the end of the bolt. (This is important to prevent you mushrooming the end of the bolt when you hit it with the air chisel)
* Attack with air chisel with the laser attachment in - no movement
* Bit of heat on the underside - attack with air chisel. Didn't move.
* Bit more heat again
* Attack with air chisel again - bolts start moving. hit it until it's as far along as you can get it with the nut still just about on.
* Nut off & attack with the impact gun to unwind the bolt.

Easier than I expected it to be, although I guess a combo of air tools, heat and luck all played their part.
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For reassembly, I've put a bit of Quicksilver Perfectseal on it all. This stuff is amazing at preventing things seizing in on the boats.

The inner bushes on the old arms were pretty shot actually, can notice the different with the new upper arms in.
20230212_130110881_iOS.jpg
"not a professional engineer, mechanic and mechanist"

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