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James M-S
Suzuka


Joined: 11 Apr 2017
Posts: 1011
Location: Derbyshire

2009 Porsche 997 Carrera 2

PostPosted: Mon Apr 08, 2019 8:49 pm    Post subject: Ball joints or coffin arms? Reply with quote

Had a little weep this avo as my cars previously unblemished MoT pass rate hit a glitch Mad

FAIL:- excessive play in front ball-joint.

Car has been driving fine, no knocking noises, tracking true, not hunting cambers in the road etc

So, my question is, do I need entire new coffin arms or can I just replace the ball joints?

Rolling Eyes

I know that if coffin arms are changed, the eccentric bolts can be tricky and it can lead to replacing lots of other bits.

Also, would I need full geo after replacing just ball joints? (I know I would after doing coffin arms)

Car is on 65k miles.

I'm not trying to avoid changing what is required but haven't noticed anything wrong with the car at all.


Thanks in advance
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DucatiRob
Kyalami


Joined: 22 Jul 2015
Posts: 1763
Location: Milton Keynes

2006 Porsche 997 Carrera 2S

PostPosted: Mon Apr 08, 2019 10:08 pm    Post subject: Reply with quote

Not sure you can replace the ball joint on it's own, it's normal to replace the complete coffin arm and probably good practice to replace both from arms. not too expensive, about £100 each for Meyle parts or double that at least for Porsche ones. You probably wouldn't need a full geo although it might be a good idea depending on how old the car is, alignment at a decent outfit should be enough!
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timbo1811
Silverstone


Joined: 13 Dec 2016
Posts: 109
Location: Dorset


PostPosted: Tue Apr 09, 2019 9:17 am    Post subject: Reply with quote

Yes you will need to replace the whole arm, not a difficult job, Get them from Autodoc,they are OEM and a good price. Key thing is not to tighten the inner securing bolt until suspension is fully loaded.
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ragpicker
Reims


Joined: 14 Apr 2013
Posts: 4009
Location: North East England


PostPosted: Tue Apr 09, 2019 11:24 am    Post subject: Reply with quote

Which ball joint? Surprised its the coffin arm as its usually the bush which disintegrates. I'd have thought the track rod end ball joint which is more amenable to test for an MOT chap

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James M-S
Suzuka


Joined: 11 Apr 2017
Posts: 1011
Location: Derbyshire

2009 Porsche 997 Carrera 2

PostPosted: Tue Apr 09, 2019 12:05 pm    Post subject: Reply with quote

ragpicker wrote:
Which ball joint? Surprised its the coffin arm as its usually the bush which disintegrates. I'd have thought the track rod end ball joint which is more amenable to test for an MOT chap

Question


Thanks, I wondered/hoped the same myself. Unfortunately I just spoke to my Indy who is confident it is the coffin arm having looked at MoT notes.

Good news is he’s gonna squeeze me in tomorrow

Thumb

Fingers crossed nothing is seized....
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timbo1811
Silverstone


Joined: 13 Dec 2016
Posts: 109
Location: Dorset


PostPosted: Tue Apr 09, 2019 12:26 pm    Post subject: Reply with quote

"Good news is he’s gonna squeeze me in tomorrow"

yeah, but is he going to fix your coffin arms......
Floor
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6761
Location: Brighton


PostPosted: Tue Apr 09, 2019 7:00 pm    Post subject: Reply with quote

Coffin arm ball joint is part of the coffin arm .. so one unit .

Not uncommon on a 996 and the 997 are starting to get old... same item .

i tend to see the play in them when i use a bar on the arm , don't normally feel play on a wiggle test of the wheel .

For it to actually fail an mot .. its pretty dam bad or the mot station doesn't know the rules .

No geo is needed .. camber is adjusted at the top on the strut mounts , tracking is on the track rods .. coffin arm doesn't effect either of these .
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 16369
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Apr 09, 2019 7:04 pm    Post subject: Reply with quote

One of my front coffin arms had serious play in the ball joint. Rest of the coffin arm was fine. Threw the geo out when changing it but I set it back to where it should be using my old school method Wink
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Kbald
Silverstone


Joined: 11 May 2018
Posts: 148
Location: West Yorkshire


PostPosted: Tue Apr 09, 2019 7:20 pm    Post subject: Reply with quote

Do tell Alex, what's your old school method please?? Thumb
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 16369
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Apr 09, 2019 8:24 pm    Post subject: Reply with quote

Grin Was only joking......

...........but - car (steering wheel) was straight as a die with the original one. Change one side and the steering wheel is then at an angle. Just adjust your track rod end on that side to bring it back again.
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James M-S
Suzuka


Joined: 11 Apr 2017
Posts: 1011
Location: Derbyshire

2009 Porsche 997 Carrera 2

PostPosted: Wed Apr 10, 2019 8:27 pm    Post subject: Reply with quote

All sorted now, MoT retest booked for Friday.

Massive thanks to Mike at Zentrum in Calverton for squeezing me in at short notice.

One of the bolts was seized so ended up being cut off and drilled out. Very glad I didn’t try and tackle it myself.

Track rod ends are fine, and there was a small amount of play in the coffin arm ball joint so my confidence is restored in my MoT guy.

Thanks all for your advice..
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