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HoTWire
Newbie


Joined: 22 Aug 2019
Posts: 5



PostPosted: Thu Aug 22, 2019 11:06 am    Post subject: I've got a stuck bolt removing rear strut, help!? Reply with quote

Hello, first time caller, I'm hoping you can help me

I'm currently trying to replace the rear shocks on my 2002 Porsche 996 C4. I've got a bit of an issue though, most of it has come apart relatively easily, but the bolt through the lower control arm doesn't want to move, it has come out a certain amount with a bit of hammer and drift action, but now seems very stuck. There isn't much space to get tools in... Any ideas?

Suspension as it sits


The nut side (the side I've been pushing from)


The greenish bit is the lovely clean bolt and how far out it is. Has another half inch to go


Also worthy of note, it is possible to rotate the bolt, so it isn't stuck fast...

I understand from reading guides and watching the couple of youtube videos about changing rear struts that it isn't uncommon this bolt to be problematic to remove. However no one seems to detail exactly what they did to get it out. Do I need to dismantle more of the rear suspension system to take pressure out the system?
 
  
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Hertsdriver
Spa-Francorchamps


Joined: 12 Nov 2018
Posts: 325
Location: Hertfordshire/London

2004 Porsche 997 Carrera 2

PostPosted: Thu Aug 22, 2019 11:22 am    Post subject: Reply with quote

is it not just under tension from the spring pushing it downward, so that its moved things sideways and locked up? have you tried spring compressors?
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 16682
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu Aug 22, 2019 11:45 am    Post subject: Reply with quote

Is it one of the eccentric bolts that go through the subframe. If so you need to cut it out between the subframe and arm. The bolt seizes inside the steel sleeve in the arm.

Edit: looking at the bottom photo, hertsdriver is right.
_________________
2000 Manual 996 C4 Arctic Silver Convertible


 
  
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HoTWire
Newbie


Joined: 22 Aug 2019
Posts: 5



PostPosted: Thu Aug 22, 2019 1:06 pm    Post subject: Reply with quote

Ah thanks folks, none of the guides mentioned using spring compressors until everything was off the car, so figured the whole thing would be unweighted at this point. I'm guessing that is also why they had issues getting the bolt out. Will give it a go tomorrow Smile
 
  
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Luddite
Nürburgring


Joined: 18 Dec 2018
Posts: 441
Location: Scotland


PostPosted: Thu Aug 22, 2019 1:31 pm    Post subject: Reply with quote

Never done this task, though perhaps a liberal spraying of the releasing agent of your choice the threads may allow it to penetrate further into the area of seizure (?) spray it a few times leaving some time for possible penetration. Might be worth spraying in from the other end also and after the last spray knock/screw the bolt back in while still wet with spray in the hope of spreading the releasing agent in further, then have another go at trying to remove it... Worth a try..?

Good luck.
 
  
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MisterCorn
Dijon


Joined: 08 Jan 2011
Posts: 7209
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Thu Aug 22, 2019 2:22 pm    Post subject: Reply with quote

I'd go with ligting the strut a bit. Either spring compressor or a bottle jack underneath it to take a little pressure off it.

MC
 
  
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Martin996RSR
Spa-Francorchamps


Joined: 08 Dec 2016
Posts: 361



PostPosted: Thu Aug 22, 2019 2:28 pm    Post subject: Reply with quote

Undo the anti roll bar drop link and if that doesn’t relieve the load sufficiently then use a jack to push up just enough on the bottom of the strut to release the bolt.
 
  
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Hertsdriver
Spa-Francorchamps


Joined: 12 Nov 2018
Posts: 325
Location: Hertfordshire/London

2004 Porsche 997 Carrera 2

PostPosted: Thu Aug 22, 2019 2:33 pm    Post subject: Reply with quote

Alex wrote:

Edit: looking at the bottom photo, hertsdriver is right.


Had to happen one day! Floor

You are replacing the shock so will need to compress the spring anyway to get the top mount off and the shock out, so might as well do it now, and then you don't have to start getting the crowbar/bottle jack out Thumb
 
  
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911munKy
Montreal


Joined: 26 Nov 2014
Posts: 537



PostPosted: Thu Aug 22, 2019 3:33 pm    Post subject: Reply with quote

As others have said the bolt is under tension, just use a jack to LIGHTLY compress the shock from underneath and it will just slide out.
You are very lucky as those bolts often seize solid through corrosion and take hours to remove.
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2000 C2 996
 
  
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 8374
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Thu Aug 22, 2019 4:11 pm    Post subject: Reply with quote

Just get your ratchet on it and wind it out, the shocker will move once the bolt comes out but the threads will be fine still....or like has been said, use something to take the pressure off it or put pressure on it... if you are scared of just winding it out.
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HoTWire
Newbie


Joined: 22 Aug 2019
Posts: 5



PostPosted: Fri Aug 23, 2019 5:14 pm    Post subject: Reply with quote

911munKy wrote:
You are very lucky as those bolts often seize solid through corrosion and take hours to remove.


Don't say that I've got to do the other side as well! Very Happy

Will get some time tomorrow to swear at it some more, will report back, but it definitely makes sense to compress the spring where it is now I think about it.

 
  
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HoTWire
Newbie


Joined: 22 Aug 2019
Posts: 5



PostPosted: Sun Aug 25, 2019 1:15 pm    Post subject: Reply with quote



Victory!

Thanks for the help, spring compressors were the answer, made it possible to move bolt out relatively easily, and possible to get strut assembly off with a light-ish tap of the hammer, rather than a pry bar.

Now I have ANOTHER stuck nut. Central top mount on the shock, I didn't loosen it when it was in place (which I get the feeling I should have done), wouldn't come away on bench. So I've removed the spring compressors and reattached the top mount in to the car so I can get some better leverage on it... to no avail Sad ... any tips or am I just bathing it regularly in penetrating fluid and attacking it periodically. Tried to my impact gun, but that didn't do much either Sad
 
  
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911munKy
Montreal


Joined: 26 Nov 2014
Posts: 537



PostPosted: Sun Aug 25, 2019 7:24 pm    Post subject: Reply with quote

Can be a ***** if seized!

Soak in penetrating fluid overnight, try socket set, impact driver, impact wrench in-situ, give shock to garage to try air gun then give up and cut off nut with a small angle grinder!
You will cut grooves in the top washer as the space is tight, you can replace the washer (expensive for what it is) or just leave it as it won’t affect the washer structurally and won’t be seen when back on the car.

At least that was my experience with the front struts, my rear ones came apart easily. There may be a better method.
Reassemble with ally grease!
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2000 C2 996
 
  
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Daviebrown
Trainee


Joined: 18 Apr 2015
Posts: 62



PostPosted: Mon Aug 26, 2019 3:11 pm    Post subject: Reply with quote

If you’re not re using the shock you can grip the shaft with a stilson through the spring then use a breaker bar on the nut
 
  
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Hertsdriver
Spa-Francorchamps


Joined: 12 Nov 2018
Posts: 325
Location: Hertfordshire/London

2004 Porsche 997 Carrera 2

PostPosted: Mon Aug 26, 2019 8:47 pm    Post subject: Reply with quote

Had the shock not got an Allen key recess in the top? Most of them have either the Allen key or a flat section to grip and use a ring spanner to undo it, if not just undo the spring compressors to put it back under tension and use a nice long breaker bar to get it started so you can put the compressors back on.
 
  
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jond58
Monza


Joined: 19 Jun 2017
Posts: 195



PostPosted: Mon Aug 26, 2019 10:12 pm    Post subject: Reply with quote

Top nut? I usually just buzz them off with the impact driver. I do have a through socket set with means you can hold the Allen key part with a ratchet and then the through ratchet to undo the other but I’ve never had to actually use it!! My mate borrowed it for his caddy however
 
  
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HoTWire
Newbie


Joined: 22 Aug 2019
Posts: 5



PostPosted: Tue Sep 03, 2019 6:11 am    Post subject: Reply with quote

Success!! Thanks for the help everyone. Top nut was a couple of over night soaks in penetrating oil and it came off pretty easily. Putting it all back together was relatively straight forward, although the bottom bolt that caused issues coming out didn't want to go back in easily (trying to get suspension all in the right place for the holes to match up) so I had the joy of smacking bits of my car's suspension with a lump hammer until everything was in the right place (one poor swing away from needing to do other, more troublesome, work).

Now to do the other side. Hopefully be able to do it in a day now, let's find out on Sunday.
 
  
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