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dan4182uk
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Joined: 23 Dec 2007
Posts: 11
Location: Leeds


PostPosted: Sun May 14, 2017 10:11 pm    Post subject: Seized coffin arm bolts Reply with quote

I set about replacing my front coffin arms this weekend, all went well until it came to removing the bolts that hold the coffin arm to the subframe. The nut came off fine, but on both sides of the car the bolts are stuck in the bush.

I tried a lot of plus gas, impact gun in both directions and quite a lot of hammer. No joy.

I've now ordered some replacement bolts and will have to try some heat next weekend.

It seems unreasonable to me that the bolts are so stuck on a 7 year old car.

Has anyone else had the same problem? If so how did you get them out? Can I expect the rear ones to be this bad too?
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 6959
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Sun May 14, 2017 11:47 pm    Post subject: Reply with quote

The best thing to do is just cut them out, they will have fused to the inner metal of the bush and will almost be impossible to get out with heat or penetrating fluid. Use copper grease when you fit new ones.
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ELA
Suzuka


Joined: 30 Aug 2011
Posts: 1080
Location: Nurburgring Doorstep


PostPosted: Mon May 15, 2017 6:39 am    Post subject: Reply with quote

Surprised to hear you're having trouble with the front end. The rears are normally the problematic ones. Advice above is the way forward Wink
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wasz
Albert Park


Joined: 28 Dec 2012
Posts: 1598


1999 Porsche 996 Carrera 2

PostPosted: Mon May 15, 2017 9:40 am    Post subject: Reply with quote

Yes happens a lot, steel bolt in alloy bush = seize. Same happens to lots of high spec cars, e.g. S2000.

Just cut them off, don't faff about too much for the price of the bolt. I used a reciprocating saw last time, I never had much luck by hand with a hacksaw blade.

Usually its rears that DIY owners have difficulty with. Maybe thats because front don't last as long, and mechanics have already been in and done the fronts with copper grease.
 
  
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steve r
Silverstone


Joined: 26 Sep 2011
Posts: 113



PostPosted: Mon May 15, 2017 12:58 pm    Post subject: Reply with quote

I had this on the rear of my friends 996 C4.
I cut the coffin arm off with a disc cutter, then cut off the rubber before cutting through the inner aluminium section that was corroded to the steel bolt. Holding the aluminium with grips I was then able to get the headed half the bolt to come out, the other section then drops out.


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dan4182uk
Newbie


Joined: 23 Dec 2007
Posts: 11
Location: Leeds


PostPosted: Mon May 15, 2017 8:18 pm    Post subject: Reply with quote

Thanks for the input - I can see now that I was not going to win that bolt battle.

For future reference they are M12x95mm.

The part number is 90037816501

They are about £4 each and design911 stock them online. As soon as they arrive my bolts are getting cut out!
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