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Grey996
Spa-Francorchamps


Joined: 24 Jan 2017
Posts: 285
Location: Sheffield


PostPosted: Wed Feb 20, 2019 4:12 pm    Post subject: Cluck when coming off and on the gas, the search continues?? Reply with quote

As the title really, I've had a clunk for a while, sometimes I can live with it but other times (like now!) it really bugs me. It's noticeable more when coming off the gas, at low as well as high speeds but I can also blip the throttle to get it.

So far relevant work within the last 12 months includes replacing all my suspension, dropped by 30mm , new clutch and 997 shifter. New engine mounts and PowerFlex gearbox mount insert.

While I was under the car doing the suspension and mounts everything that else that needed it was cleaned, repainted and everything I could find with a bolt was checked to make sure all tight.

Reading around the only other suggestions I could find were the drive shaft CV joints but I'm not sure. Anyone else have any suggestions?

Thanks
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2002 Porsche 996 C2
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Teg
Trainee


Joined: 04 Nov 2012
Posts: 57



PostPosted: Wed Feb 20, 2019 4:27 pm    Post subject: Reply with quote

is your car 4wd?

i had a similar problem years ago with a C4S. In the end i lived with it but it felt like play between the gearbox and front diff.
 
  
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jezgreen911
Nürburgring


Joined: 12 Dec 2012
Posts: 402
Location: Bucks


PostPosted: Wed Feb 20, 2019 5:11 pm    Post subject: Reply with quote

Stay My car does this and has similar mods, I'm pretty sure I started noticing the 'clunk' after I fitted the RSS engine mounts and Powerflex gearbox insert, it's on my list to investigate but I seem to have a pretty long 'to do' list Rolling Eyes
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Grey996
Spa-Francorchamps


Joined: 24 Jan 2017
Posts: 285
Location: Sheffield


PostPosted: Wed Feb 20, 2019 5:46 pm    Post subject: Reply with quote

Thanks both.

Mines an 02 C2 with £126k, it does feel gearbox/drive shaft related.

I can’t remember that it’s always done it but it’s certainly more noticeable. The suspension I did anyway but the gearbox and engine mounts I’ve done trying to sort the clunk.
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 15994
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed Feb 20, 2019 6:04 pm    Post subject: Reply with quote

It's play between you diff & pinion gear. You need to adjust the position using various thickness shims.

Edit: or your diff. bearings could also be worn.
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Last edited by Alex on Wed Feb 20, 2019 6:56 pm; edited 1 time in total
 
  
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Grey996
Spa-Francorchamps


Joined: 24 Jan 2017
Posts: 285
Location: Sheffield


PostPosted: Wed Feb 20, 2019 6:39 pm    Post subject: Reply with quote

Thanks Alex, i’ll have a look into that, see if I can find a how to guide.
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Mac996t
Nürburgring


Joined: 26 Mar 2011
Posts: 483


2004 Porsche 996 Turbo

PostPosted: Wed Feb 20, 2019 6:43 pm    Post subject: Reply with quote

Could it be play in the dual mass flywheel?
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 15994
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed Feb 20, 2019 6:49 pm    Post subject: Reply with quote

Mac996t wrote:
Could it be play in the dual mass flywheel?


Isn't the symptom of that juddering when setting off (as the clutch is engaged)?
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 15994
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed Feb 20, 2019 6:55 pm    Post subject: Reply with quote

Diff backlash sounds like this:


Open Youtube Page

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Grey996
Spa-Francorchamps


Joined: 24 Jan 2017
Posts: 285
Location: Sheffield


PostPosted: Wed Feb 20, 2019 7:34 pm    Post subject: Reply with quote

It certainly could be that, I felt quite hopeful with the mention of shims but that looks quite involved!

Any idea of cost?
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6523
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PostPosted: Wed Feb 20, 2019 8:07 pm    Post subject: Reply with quote

Pm sent .
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wasz
Sepang


Joined: 28 Dec 2012
Posts: 2916


1999 Porsche 996 Carrera 2

PostPosted: Thu Feb 21, 2019 10:52 am    Post subject: Reply with quote

I had a horrible clunk on/off power that I was convinced was my flywheel bolts come loose after I had it all apart. Had it on the ramps at my local garage and they said it was the coffin arms.

But it turned out to be the brace that runs left to right under the gearbox.

The bolts were tight, but I removed it again, cleaned up corrosion on the ends and mounting faces and re-torqued the bolts down and the clunk was gone.
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Grey996
Spa-Francorchamps


Joined: 24 Jan 2017
Posts: 285
Location: Sheffield


PostPosted: Thu Feb 21, 2019 1:49 pm    Post subject: Reply with quote

Thanks, unfortunately I can’t pin point when I started to notice it so I can trace back what might be the cause. When I stripped the suspension I did remove the braces, sand them back and repaint them. I’ll certainly double check them though.

I’ll try and record the noise but I don’t think the camera will pick it up. I can feel it as well, not through the pedal or steering wheel but definitely from the back. It’s one of those knocks that if someone else drove the car they might not even notice it but as it’s my car it’s bugging me.
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DavidM
Newbie


Joined: 22 Oct 2017
Posts: 21



PostPosted: Thu Feb 21, 2019 7:21 pm    Post subject: Reply with quote

Far more likely to be a worn dual mass flywheel than backlash in the diff.
 
  
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Mac996t
Nürburgring


Joined: 26 Mar 2011
Posts: 483


2004 Porsche 996 Turbo

PostPosted: Thu Feb 21, 2019 7:51 pm    Post subject: Reply with quote

If you jack up one of the rear wheels and put it in 1st gear then rotate the wheel you maybe able to reproduce the noise and track where it’s coming from
 
  
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markv8
Trainee


Joined: 27 May 2015
Posts: 80



PostPosted: Thu Feb 21, 2019 9:39 pm    Post subject: clunk Reply with quote

I have rss engine mounts , poly bush gearbox and never had any noises until yesterday , having a right foot moment backed of and clunk , first time ive heard that , so I play with the throttle at about 60 _70 on off clunk clunk new noise and its been sat in a garage for two months so from what I can hear its diff or gearbox related
 
  
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markv8
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Joined: 27 May 2015
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PostPosted: Thu Feb 21, 2019 9:41 pm    Post subject: clunk Reply with quote

I have rss engine mounts , poly bush gearbox and never had any noises until yesterday , having a right foot moment backed of and clunk , first time ive heard that , so I play with the throttle at about 60 _70 on off clunk clunk new noise and its been sat in a garage for two months so from what I can hear its diff or gearbox related
 
  
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skinny_monkey
Nürburgring


Joined: 16 Sep 2014
Posts: 416



PostPosted: Thu Feb 21, 2019 10:04 pm    Post subject: Reply with quote

Could it be the propshaft donut?
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 15994
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu Feb 21, 2019 11:24 pm    Post subject: Reply with quote

It should be possible to diagnose as either running gear problem or suspension problem by trying to replicate the clunk whilst coasting in neutral and braking hard on/off instead. If it still does it with brakes it's suspension/other, if not then it's running gear.
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