Welcome to 911UK
The only place for Porsche, 911uk is the definitive enthusiast and resource site for the Porsche 911.
Registration is fast, simple and absolutely free, so join up today for full access to the site and benefit from latest member offers.

Porsche Classifieds
Sell Your Porsche on 911uk
Create a Free Classified Advert
Search Ads
Classified Adverts FAQ
Trade Classified Information
Buyer & Seller Fraud Protection
Consumer Rights Act
Pre Purchase Inspection (PPI)
Porsche Car Sourcing
Porsche Cars Wanted
Official Porsche Centre Reviews
Model
Stock
Porsche 911
992 : 2019- 0
991 : 2011- 21
997 : 2004- 62
996 : 1997-2005 32
993 : 1993-1998 5
964 : 1989-1993 2
Carrera 3.2 : 1983-1989 3
Carrera SC : 1977-1983 2
930 Turbo : 1975-1989 1
Early 911 : 1964-1977 1
Porsche Other Models
Classic : 1950-1965 0
Boxster : 1997- 29
Cayman : 2005- 21
Cayenne : 2003- 5
Macan : 2014- 5
Panamera : 2009- 0
912-914-924-928-944-968 1
959 - CarreraGT - RaceCar 0
Car Parts For Sale & Wanted
Other Items For Sale & Wanted
Wheels Tyres For Sale & Wanted
Number Plates For Sale Wanted

Porsche Services
Porsche Body Shop Repair
Paint Protection & Wrapping
Porsche Classic Insurance
Porsche Classic Parts
Porsche Classic Restoration
Porsche Design Collection
Porsche Engine Gearbox Rebuild
Porsche Heritage & History
Porsche News
Porsche Picture Gallery
Win a New Porsche 911

Porsche Parts
Body Parts, Body Styling
Brakes, Clearance
Electrical, Exhausts
Engine Cooling, Engine Electrical
Engine Rebuild, Heating Cooling
Interior Incar, Lighting
Rubber Seals, Service Parts
Steering, Suspension
Transmission, Workshop Tools
Early 911, 911 - 930, 928 - 968
964 - 993, 996 - 997, Boxster
Cayman, Cayenne, Panamera

Porsche Model Range
911 [992] 2018-Current
Porsche 911 [992]
911 [991] 2011-2019
Porsche 911 [991]
911 [997] 2004-2012
Porsche 911 [997]
911 [GT] GT1-GT2-GT3
Porsche 911 [GT]
911 [996] 1997-2005
Porsche 911 [996]
911 [993] 1993-1998
Porsche 911 [993]
911 [RS] RS-RSR
Porsche 911 [RS]
911 [964] 1989-1993
Porsche 911 [964]
911 3.2 1983-1989
Porsche 911 3.2 Carrera
911 SC 1977-1983
Porsche 911 SC
911 [Early] 1964-1977
Porsche 911 [Early]
Boxster & Cayman
Porsche Boxster & Cayman
Cayenne & Panamera
Porsche Cayenne & Panamera

911uk Site Partners

Post new topic   Reply to topic
Author Message
Marky911
Magny-Cours


Joined: 04 Jun 2009
Posts: 2629



PostPosted: Sat Jul 13, 2019 8:13 pm    Post subject: Splitting lower coffin arms to add shims - Special tool?? Reply with quote

Hi gents,

I want to get some camber off my 996 GT3. We managed (just) to crack the nuts off on the studs from the inner bush, located up in the recesses on the underside of the coffin arm.
We removed the 12mm shims and put 6mm back in but because the studs were then protruding further the socket bottomed out before the nuts were tight.
That was with a standard quarter drive size socket and wobble bit. A long socket won’t fit due to the shape of the recesses. Neither will any spanner.

So anyway we’ve had to refit the 12mm shims until I figure out what tools to get. Not sure I trust my alignment place to do it.

So any info on what tool works best would be appreciated.

Cheers. Thumb

PS. That was on top of my new air-con rads not fitting my coolant rads so that stopped play there. frustrated
 
  
View user's profile Send private message
   
infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 8465
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Sat Jul 13, 2019 9:10 pm    Post subject: Reply with quote

I was looking at fitting a pair of rear GT3 arms to mine but I assumed adjusting would be fine with a ring/open end spanner when looking but without actually doing this I may be totally wrong and hope to be corrected for when the time comes. Although if you are referring to torquing that may be a different story?
_________________
http://euroroadtripper.blogspot.co.uk/

 
  
View user's profile Send private message Visit poster's website
   
Marky911
Magny-Cours


Joined: 04 Jun 2009
Posts: 2629



PostPosted: Sat Jul 13, 2019 9:34 pm    Post subject: Reply with quote

Hi Chris,

Not too bothered about torquing them. I was just gonna tighten them to FT. Very Happy

See the pic of offending item below. The access channels look wider in pic than real life. Certainly no ring key or any other spanner I have will fit.
It can’t be that hard though as I’ve never heard of anyone else having bother. bonk





If you imagine once you’ve taken that 12mm shim out, there’s then 12mm extra stud sticking through the nuts. That makes things tricky.
 
  
View user's profile Send private message
   
infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 8465
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Sat Jul 13, 2019 9:56 pm    Post subject: Reply with quote

FT is always about right Thumb

But yes looks like I'd be able to get a spanner on it but again what do I know as I've never done them, I have modified spanners before to make fit things in similar situations, I assume a GT bod will be along with the answer soon.
_________________
http://euroroadtripper.blogspot.co.uk/

 
  
View user's profile Send private message Visit poster's website
   
Slippydiff
Nürburgring


Joined: 22 Nov 2007
Posts: 406



PostPosted: Sun Jul 14, 2019 12:02 am    Post subject: Reply with quote

Hi Mark, hope you’re well ?
How big are your nuts ? Mr. Green
I ask as the nuts in your image look like 13mm items on M8 threads, they should be 10mm nuts on M6 threads ... Hopefully they’re the correct M6/10mm items though ?
Either way, 4 of these little blighters will be your friends and make things easier :

https://tridentracing.co.uk/product/knuts-aircraft-spec/

As you’ll know, an M6 K nut has a 7mm hex, and the M8 a 10mm hex, plenty of room left to swing a spanner or a deep 1/4 drive socket once the shim has been removed and the K nuts fitted in place of the standard nuts.

I seem to recall Matt at Fearnsport fits them “as standard” whenever he’s using the shims to adjust the camber.
 
  
View user's profile Send private message
   
Marky911
Magny-Cours


Joined: 04 Jun 2009
Posts: 2629



PostPosted: Sun Jul 14, 2019 9:43 pm    Post subject: Reply with quote

Evenin’ Chris, it turns out you’re half right then. You could get a spanner on the nuts if they were the right size. As Henry has impressively identified below, mine aren’t the proper size. Thanks for your input. Thumb


Hi Henry. All good here thanks, likewise I hope you’re well and enjoying the fruits of your labour with the Zanzibar car. Thumb

Super info above. Top notch.
So my nuts and studs aren’t the proper sizes then. They are indeed 13mm nuts, on most likely M8 studs.
Have you seen these before then? Pattern parts?

Thanks for the link to the K nuts too. I’m going to check I can get a 10mm spanner in there tomorrow and then order some of those nuts.
I’m guessing there’s no risk to using them. I don’t want a coffin arm separating down a mountain pass. Surprised

I’m thinking get the ones with the integrated washer so the surface area of the mating face is nearer that of a 13mm nut?

Anyway I’ll look into it tomorrow and hopefully that’s the solution. I hope it’s that simple. My mate here thinks we’ll still have bother due to the stud being 8mm instead of 6, as once we drop from 12mm to 6mm on the shims, the studs stick through a long way.

We’ll see though. Like I say, that’s great info. Much appreciated, as ever. Thumb
 
  
View user's profile Send private message
   
Slippydiff
Nürburgring


Joined: 22 Nov 2007
Posts: 406



PostPosted: Sun Jul 14, 2019 11:28 pm    Post subject: Reply with quote

Something didn’t seem quite right about this issue ... so some further digging was required !!

Double check my thoughts on the stud and nut sizes Mark, I’m pretty sure I’m right in saying they should be M6/10mm nuts/studs, and this screenshot I’ve taken of a thread about swapping the shims from 6Speedonline would appear to confirm their size :



With the stud/nut size confirmed, I think I’ve established the other “problem” that’s causing your issue with access to the nuts.

The studs should have each have two 5-6mm thick spacers (you can see them in place in your image) with an ID of 6mm and an OD of 9-10mm, these are “stacked” under the securing nuts when the thick shims are NOT being utilised.

Their use ensures the nuts never bottom out on the threads of the studs, but they also ensure the nuts end up in a part of the recess in the arm that allows better access with a ring/combo spanner (or socket) when the thick/thickest shims aren’t being used.

I’ve highlighted the spacers you’ll need in this image :



and they can be seen in situ in this image of a 991 control arm :



I think with all but the thicker shims in place, you can run a locknut in addition to the securing nut, but with the camber maxed out with the thickest shims, only one nut can be used. Unfortunately when thick shims ate in place, those spacers get left on the bench or popped into someone’s tool chest/the “washer box”.

FWIW, aerospace spec K nuts have far, far superior torque capacity than mild steel fasteners. Rich Beaumont will be better able to advise on their merits.
 
  
View user's profile Send private message
   
Marky911
Magny-Cours


Joined: 04 Jun 2009
Posts: 2629



PostPosted: Mon Jul 15, 2019 8:20 pm    Post subject: Reply with quote

worship

The info got even better with your second instalment. I owe you one Henry.

So yep I double checked things this afternoon and I have now ordered 4x M8 10mm K nuts and 4x M8 6mm thick stainless spacers.
Hopefully that lot will get me sorted. I’ll report back after the weekend when it’s also episode 3 of my radiator and condenser fiasco. Grin

Not a relaxing run up to my holidays. nooo Grin
 
  
View user's profile Send private message
   
Display posts from previous:   
Post new topic   Reply to topic   All times are GMT - 12 Hours
Page 1 of 1

 
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum
You cannot post calendar events in this forum