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Kbald
Monza


Joined: 11 May 2018
Posts: 182
Location: West Yorkshire


PostPosted: Sun Aug 18, 2019 6:37 pm    Post subject: Changing rear coffin arms and tuning forks Reply with quote

Hi all. So far recently I've changed the front coffin arms and the tuning forks and the engine mounts. I then set about the rear coffin arms and tuning forks but have drawn a blank. I think I need to mark up the eccentric bolts on the coffin arms and wonder what the best way to do this is?

For the tuning forks there is a top bolt to enable you to undo the ball joint end but it's impossible to get any sort of spanner in there to hold it so does anyone know how I go about doing them too? Thanks in advance
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MisterCorn
Dijon


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

2004 Porsche 996 Turbo

PostPosted: Sun Aug 18, 2019 6:48 pm    Post subject: Reply with quote

You can get an open ended spanner in there. For the others just take a photo and unbolt it all. You will be getting the geometry done afterwards anyway. Good luck getting the eccentric bolts out.

MC
 
  
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wasz
Sepang


Joined: 28 Dec 2012
Posts: 2971


1999 Porsche 996 Carrera 2

PostPosted: Sun Aug 18, 2019 6:49 pm    Post subject: Reply with quote

You will be cutting the eccentrics off, get a one of those hacksaw blade holders and a a pile of good blades.

Just mark the approx position and get it aligned afterwards at a garage.

The ball joint ends will be stuck in the hub carrier so don't worry about it just undo them and use a splitter.

Sometimes the steel insert from the hub carrier comes with it

Did you do the front inner and outer track rods too? Also front top mounts may need doing. Then you will have all new. Also front gearbox mount makes a difference, but wait till you drop the box for that.
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Kbald
Monza


Joined: 11 May 2018
Posts: 182
Location: West Yorkshire


PostPosted: Sun Aug 18, 2019 7:00 pm    Post subject: Reply with quote

Thanks. I did the inner track rods as the outers seemed fine. No top mounts yet either as prices for the carrera 4!

Mistercorn I tried with an open ended spanner but the gap wasn't big enough but must admit I didn't try too hard as I was thinking how will I get the bolt back in the bottom and line up with this nut in a tiny gap and even worse it it moves? Or is it locked in position so that's not a concern.

I'm still hoping I will be lucky with the eccentric bolts and don't need to cut them out as I have seen some posts on here that show the pain with the hack saw! Might get a resiprocating saw if I need to do that!
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Everitj
Newbie


Joined: 01 Jan 2018
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PostPosted: Mon Aug 19, 2019 12:26 pm    Post subject: Reply with quote

It's a 21mm for the top of the tuning fork. I've just done mine. You should be able to get the spanner down the gap so it is in line with the car and hold the top whilst undoing the bottom 18mm bolt head. The coffin arm I cut off flush and then cut in half with an angle grinder as the bolts were seized. Much quicker than a hack saw.
 
  
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Kbald
Monza


Joined: 11 May 2018
Posts: 182
Location: West Yorkshire


PostPosted: Tue Aug 20, 2019 5:47 am    Post subject: Reply with quote

Thanks everitj does the top but stay in place then when removed?
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pye21
Trainee


Joined: 11 Mar 2014
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PostPosted: Tue Aug 20, 2019 5:56 am    Post subject: Reply with quote

Buy a reciprocating saw to cut the bolts off. Lots easier than messing about with a hand saw.

https://www.screwfix.com/p/mac-allister-msrs850-850w-electric-reciprocating-saw-220-240v/625fx
 
  
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wasz
Sepang


Joined: 28 Dec 2012
Posts: 2971


1999 Porsche 996 Carrera 2

PostPosted: Tue Aug 20, 2019 10:03 am    Post subject: Reply with quote

Kbald wrote:
Thanks. I did the inner track rods as the outers seemed fine. No top mounts yet either as prices for the carrera 4!


The ones for a 997 c4 are much cheaper for some reason, a few people on here are using them have a search.

Everitj wrote:
The coffin arm I cut off flush and then cut in half with an angle grinder as the bolts were seized. Much quicker than a hack saw.


Thats the way to do it! (unless you are exchanging arms at Hartech for refurbed arms).

I don't remember having a problem getting a spanner on to undo the balljoint.
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Martin996RSR
Spa-Francorchamps


Joined: 08 Dec 2016
Posts: 361



PostPosted: Tue Aug 20, 2019 12:03 pm    Post subject: Reply with quote

You may find they come undoone without needing to cut them..


Floor


I used a reciprocating saw to get mine off, but I can see how a grinder would probably be a good deal quicker.

On the bright side, I recently replaced some parts of the front suspension on my car and because when I had first taken apart and reassembled that end about six years ago I had used copper grease, it all came undone without any fuss.
 
  
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Kbald
Monza


Joined: 11 May 2018
Posts: 182
Location: West Yorkshire


PostPosted: Tue Aug 20, 2019 3:41 pm    Post subject: Reply with quote

Re above can't seem to quote it but = I don't remember having a problem getting a spanner on to undo the balljoints.
It was the top nut on the tuning fork that was the issue rather than the coffin arms.

Thanks for all the suggestions. Where is the best place for the eccentric Bo?rs? OPC or are they generic sized ones I can pick up from eBay etc?
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 16681
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Aug 20, 2019 5:08 pm    Post subject: Reply with quote

Various places do them but you'll probably find OPC are the cheapest.....and genuine.
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Kbald
Monza


Joined: 11 May 2018
Posts: 182
Location: West Yorkshire


PostPosted: Tue Aug 20, 2019 5:20 pm    Post subject: Reply with quote

Thumb thanks Alex
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Everitj
Newbie


Joined: 01 Jan 2018
Posts: 2



PostPosted: Tue Aug 20, 2019 5:31 pm    Post subject: Reply with quote

Kbald wrote:
Thanks everitj does the top but stay in place then when removed?


No but there is a recess in the top of the casting that holds it in position when it comes to doing it back up
 
  
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Kbald
Monza


Joined: 11 May 2018
Posts: 182
Location: West Yorkshire


PostPosted: Tue Aug 20, 2019 5:35 pm    Post subject: Reply with quote

Everitj wrote:
Kbald wrote:
Thanks everitj does the top but stay in place then when removed?


No but there is a recess in the top of the casting that holds it in position when it comes to doing it back up


Perfect thanks
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Kbald
Monza


Joined: 11 May 2018
Posts: 182
Location: West Yorkshire


PostPosted: Mon Aug 26, 2019 12:53 pm    Post subject: Reply with quote

So just done the tuning fork. Think my spanner access issue was due to having the axle stands on the subframe. Have them on tne jacking point and now it's given me a touch more room and just enough to get the spanner in.

The coffin arms are still the old ones though. I got the nut off the eccentric bolt and could turn it but no way could I get it out. Is there anyway to do this at all!? Can't get a hammer in and a pry bar was doing nothing or is it a cut the bolts job?
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 16681
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Mon Aug 26, 2019 12:55 pm    Post subject: Reply with quote

Cut the bolts out. Wasting your time with any other ideas.

http://911uk.com/viewtopic.php?t=125503&postdays=0&postorder=asc&start=136
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Kbald
Monza


Joined: 11 May 2018
Posts: 182
Location: West Yorkshire


PostPosted: Mon Aug 26, 2019 3:40 pm    Post subject: Reply with quote

Thanks. Just did the other side and the coffin arm bolt slid right out no problem so looks like only 1 to cut out which is a 50% bonus.

Now my new issue is the ball joints! How on earth would one go about getting these out? Can barely get a spanner in there never mind a ball joint splitter or hammer to hammer the hub.

Ive just done the tuning forks for now both sides and the squeak seems to have gone away. Not 100% sure the coffin arms will need replacing based on the front end as the rubber bushes were OK on these but the ball joint was loose so I suppose its best to do them.
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Ghianightmare
Spa-Francorchamps


Joined: 25 Apr 2017
Posts: 353
Location: Dublin


PostPosted: Mon Aug 26, 2019 6:23 pm    Post subject: Reply with quote

If you have the funds, replace them. They will transform the handling.
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Ghianightmare
Spa-Francorchamps


Joined: 25 Apr 2017
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PostPosted: Mon Aug 26, 2019 6:27 pm    Post subject: Reply with quote

A scene from my project
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Kbald
Monza


Joined: 11 May 2018
Posts: 182
Location: West Yorkshire


PostPosted: Mon Aug 26, 2019 6:40 pm    Post subject: Reply with quote

I have the replacement coffin arms already for the rears so may as well do them. Just need to work out how to get the ball joints off due to lack of room in there! Trying to find a you tube video but they are all for the front ones which are all done.

Will get a resipricating saw for the side that the eccentric bolt won't come out of too.
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