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Gooey36
Trainee


Joined: 23 Aug 2017
Posts: 81



PostPosted: Mon Aug 06, 2018 4:55 pm    Post subject: Another “what’s that clunk thread”... Reply with quote

Hi all,

Recently developed a odd clink/clunk noise from (what I think) is the back of my ‘03 996.2 manual coupe.

It happens when pulling off in first or being hard on the throttle in 2nd and 3rd. Also happens in 1st and 2nd when letting off the throttle sharply. Also seems pronounced when on full lock in either direction at slow (sub 5mph). 90% sure it’s from the rear.

Clutch and flywheel done at 69k, all tuning forks and cofffin arms, drop links and ARB bushes are done.

Bit of a long shot - is there anything I can inspect/check?! Ive got it on the ramps ready to have a crawl around later!

My thoughts are maybe CV joint, motor or transmission mounts maybe? Is there anyway of checking other than visual? It’s almost something feels loose and it’s slapping about when accelerating or decelerating sharply! Checked for anything loose in the front, cabin and rear and nothing obvious...

Thanks!
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NLW73
Barcelona


Joined: 27 May 2014
Posts: 1259
Location: Yateley


PostPosted: Mon Aug 06, 2018 5:48 pm    Post subject: Reply with quote

engine mounts? are they the original ones?

mine used to do this and when we took them out they were fubarred.

if its is mounts then worth changing to the 993 RS ones and get them from Type 911 in kent and speak to matt. done me a great deal cash

also tightens up the rear of the car and improves handling. great mod to do

given its under load its worth checking.

what about the ARB and the D bushes that sit in those? again they would contribute to the noise.
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Gooey36
Trainee


Joined: 23 Aug 2017
Posts: 81



PostPosted: Mon Aug 06, 2018 6:17 pm    Post subject: Reply with quote

NLW73 wrote:
engine mounts? are they the original ones?

mine used to do this and when we took them out they were fubarred.

if its is mounts then worth changing to the 993 RS ones and get them from Type 911 in kent and speak to matt. done me a great deal cash

also tightens up the rear of the car and improves handling. great mod to do

given its under load its worth checking.

what about the ARB and the D bushes that sit in those? again they would contribute to the noise.


Mounts are original, cars done 76k now.

As for the ARB bushes, they’re new powerflex ones.

Guessing they motor mounts can’t be seen to be defective until replaced?

Thanks for the tip on replacement options 👍
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kas750
Estoril


Joined: 31 Mar 2013
Posts: 3999
Location: Chorley lancashire

2006 Porsche 911

PostPosted: Mon Aug 06, 2018 7:11 pm    Post subject: Re: Another “what’s that clunk thread”... Reply with quote

Gooey36 wrote:
Hi all,

Recently developed a odd clink/clunk noise from (what I think) is the back of my ‘03 996.2 manual coupe.

It happens when pulling off in first or being hard on the throttle in 2nd and 3rd. Also happens in 1st and 2nd when letting off the throttle sharply. Also seems pronounced when on full lock in either direction at slow (sub 5mph). 90% sure it’s from the rear.

Clutch and flywheel done at 69k, all tuning forks and cofffin arms, drop links and ARB bushes are done.

Bit of a long shot - is there anything I can inspect/check?! Ive got it on the ramps ready to have a crawl around later!

My thoughts are maybe CV joint, motor or transmission mounts maybe? Is there anyway of checking other than visual? It’s almost something feels loose and it’s slapping about when accelerating or decelerating sharply! Checked for anything loose in the front, cabin and rear and nothing obvious...

Thanks!


Check the bolts that secure the diagonal support bars particulary at the sill end are fitted at the right end of the bars and that the torque value is correct.
I had a similar noise that was driving me mad and it was these bolts that were not torqued correctly and the entire sub assembly was clunking/creaking under sharp acceleration .
My car had previous to my ownership had the engine dropped to fit an AOS and M030 and was not put back together properly by a North west specialist that should know better!!
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5158
Location: Brighton


PostPosted: Mon Aug 06, 2018 7:21 pm    Post subject: Reply with quote

A sound clip is always helpfull Wink

Check your wheel bolts are tight !

The brace bars from the lower engine safety bar to the body by the jacking point .. make sure those bolts are tight . and again the bar from left to right ... this if not tight will make a knocking noise and it took me ages to find it the last time .. sigh .

Everything else has been covered from what i can see.
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Gooey36
Trainee


Joined: 23 Aug 2017
Posts: 81



PostPosted: Mon Aug 06, 2018 7:46 pm    Post subject: Reply with quote

I did try to get a sound clip but I need an extra pair of hands to help whilst I drive!

I have measured the exhaust tip and and the right hand side is approx 1 and a quarter inch from the bumper, whereas the left is just under 1”. Original mounts - they probably could do with being replaced I would think at that age.

Will check all the strut bars in the morning but hadn’t thought to check those!
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NLW73
Barcelona


Joined: 27 May 2014
Posts: 1259
Location: Yateley


PostPosted: Mon Aug 06, 2018 9:00 pm    Post subject: Reply with quote

yep I was going to say that about the exhaust tips, measure them and if they are not level that is a sign that the mounts are shagged.

here is the link to the uprated mounts:

https://type911shop.co.uk/epages/de867ca1-377e-432e-84fd-bdccf2206766.sf/en_GB/?ObjectPath=/Shops/de867ca1-377e-432e-84fd-bdccf2206766/Products/9793

they are awesome and have sorted my 996 out a treat. they are not as extreme as the rennline or RSS mounts so hardly any more cabin noise.
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rdodger
Silverstone


Joined: 08 Apr 2018
Posts: 149
Location: Cheshire


PostPosted: Mon Aug 06, 2018 9:09 pm    Post subject: Reply with quote

NLW73 wrote:
yep I was going to say that about the exhaust tips, measure them and if they are not level that is a sign that the mounts are shagged.

here is the link to the uprated mounts:

https://type911shop.co.uk/epages/de867ca1-377e-432e-84fd-bdccf2206766.sf/en_GB/?ObjectPath=/Shops/de867ca1-377e-432e-84fd-bdccf2206766/Products/9793

they are awesome and have sorted my 996 out a treat. they are not as extreme as the rennline or RSS mounts so hardly any more cabin noise.


Are they a direct fit for a 996 or do they need longer bolts?
 
  
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Gooey36
Trainee


Joined: 23 Aug 2017
Posts: 81



PostPosted: Mon Aug 06, 2018 9:27 pm    Post subject: Reply with quote

NLW73 wrote:
yep I was going to say that about the exhaust tips, measure them and if they are not level that is a sign that the mounts are shagged.

here is the link to the uprated mounts:

https://type911shop.co.uk/epages/de867ca1-377e-432e-84fd-bdccf2206766.sf/en_GB/?ObjectPath=/Shops/de867ca1-377e-432e-84fd-bdccf2206766/Products/9793

they are awesome and have sorted my 996 out a treat. they are not as extreme as the rennline or RSS mounts so hardly any more cabin noise.


Thanks buddy - will get them ordered after I’ve checked the other bits. See if that solves it...
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NLW73
Barcelona


Joined: 27 May 2014
Posts: 1259
Location: Yateley


PostPosted: Tue Aug 07, 2018 6:37 am    Post subject: Reply with quote

direct fitment as far as I am aware.

you need to order this kit for the 996 as 10mm longer bolts.

https://type911shop.co.uk/epages/de867ca1-377e-432e-84fd-bdccf2206766.sf/en_GB/?ObjectPath=/Shops/de867ca1-377e-432e-84fd-bdccf2206766/Products/9792

just ask for the kit 9792
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wasz
Magny-Cours


Joined: 28 Dec 2012
Posts: 2586


1999 Porsche 996 Carrera 2

PostPosted: Tue Aug 07, 2018 12:54 pm    Post subject: Reply with quote

deMort wrote:
. and again the bar from left to right ... this if not tight will make a knocking noise and it took me ages to find it the last time .. sigh .


This.

I had a clunk creak on/off the power and pulling away after fitting a new clutch and flywheel

The bolts were right on my car but still creeek

This bar is alloy so clean corrosion off the mounting faces of the bar and the mount and re tighten the bolts.
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Magic919
Imola


Joined: 05 Jun 2013
Posts: 826
Location: Berkshire


PostPosted: Tue Aug 07, 2018 3:19 pm    Post subject: Reply with quote

Sounds like a job for some chassis ears.
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Gooey36
Trainee


Joined: 23 Aug 2017
Posts: 81



PostPosted: Tue Aug 07, 2018 5:48 pm    Post subject: Reply with quote

Magic919 wrote:
Sounds like a job for some chassis ears.


Aint that the truth!

Checked all the struts, all loosened, cleaned and re-torqued. Still a clunk! Even checked every other bolt head I could get a socket on. All tight.

Motor mounts and transmission mount do look suspect...but we’ll see.

Nipping to the specialist Thursday before i go away to get a more final opinion before I start replacing bits!
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Gooey36
Trainee


Joined: 23 Aug 2017
Posts: 81



PostPosted: Fri Aug 10, 2018 3:19 pm    Post subject: Reply with quote

Update....

Specialist things it’s rear pads moving as no shims fitted!

Fingers crossed that’s it as that will be the cheapest easiest to fix suspension problem I’ll ever get on a 911!

Will update if it sorts it..
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kas750
Estoril


Joined: 31 Mar 2013
Posts: 3999
Location: Chorley lancashire

2006 Porsche 911

PostPosted: Fri Aug 10, 2018 4:38 pm    Post subject: Reply with quote

Gooey36 wrote:
Update....

Specialist things it’s rear pads moving as no shims fitted!

Fingers crossed that’s it as that will be the cheapest easiest to fix suspension problem I’ll ever get on a 911!

Will update if it sorts it..

Could well be?! I had that on my 944 25 years ago and it was diagnosed as worn rear output shaft bearings by another well known specialist!!?
That is why I do most of my own work these days.
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Gooey36
Trainee


Joined: 23 Aug 2017
Posts: 81



PostPosted: Tue Aug 21, 2018 6:12 pm    Post subject: Reply with quote

UPDATE!

still not resolved however found a few other heatshields(coil pack and brake shield) which were loose on both sides so rectified those. Noise not fixed though. Will try and take a video of the car rolling to see if I can generate the noise....

Also fitted the shims as advised but no joy.

Booked in at a specialist again on the 5th sep to further investigate!

Also, while the car was in the air I took a short video of the rear axle being rotated...can someone tell me if the noise is normal?!

https://youtu.be/XLlIEL4p5gI

Cars in neutral and handbrake off (obviously)!
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deMort
Zolder


Joined: 21 Mar 2015
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Location: Brighton


PostPosted: Tue Aug 21, 2018 7:31 pm    Post subject: Reply with quote

I would suggest you take the rear discs off and check the handbrake shoes .. sounds to me like a retainer clip for the shoes has come off.

Knocking is pads moveing i would have though .. check the backing plates are attatched to the pads .

EDIT ..

Actually im going to change this from suggest to do it please .

It may just be me .. i may be wrong .. but ive seen Boxsters self destruct from this sort of thing .. no panic but id rather be wrong than it end in tears .

At the end of the day you just waste a little time .. if im right then the time was worth it .

Dont worry .. you can always moan at me if im wrong Very Happy
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Gooey36
Trainee


Joined: 23 Aug 2017
Posts: 81



PostPosted: Tue Aug 21, 2018 8:00 pm    Post subject: Reply with quote

deMort wrote:
I would suggest you take the rear discs off and check the handbrake shoes .. sounds to me like a retainer clip for the shoes has come off.

Knocking is pads moveing i would have though .. check the backing plates are attatched to the pads .

EDIT ..

Actually im going to change this from suggest to do it please .

It may just be me .. i may be wrong .. but ive seen Boxsters self destruct from this sort of thing .. no panic but id rather be wrong than it end in tears .

At the end of the day you just waste a little time .. if im right then the time was worth it .

Dont worry .. you can always moan at me if im wrong Very Happy



See attached pic, all looks normal? (Nothing loose)

As for the pads, I’ve rotated and kept my finger on the pads and the “clunk” doesn’t feel like it’s coming through them...in fact with the new shims in the pads are almost hard up to the disc. Certainly not sloppy!

And no moaning will come from me, rather try then have it all go pear shaped!

Thanks Demort.
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Gooey36
Trainee


Joined: 23 Aug 2017
Posts: 81



PostPosted: Tue Aug 21, 2018 8:05 pm    Post subject: Reply with quote

In fact Demort, I took another short video with the disc off showing the noise...

https://youtu.be/e0gR8VOdJp0

Just to confirm it isn’t pads or shoes...
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NLW73
Barcelona


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Location: Yateley


PostPosted: Tue Aug 21, 2018 8:23 pm    Post subject: Reply with quote

money still on engine mounts. especially if you are on the originals.

get one whipped out and you will know

see my build thread on what a shagged OEM mount looks like
http://911uk.com/viewtopic.php?t=124268&postdays=0&postorder=asc&start=20

page 2 about half way down. the actual bolt in the mount were like the leaning tower of pisa and meant to be straight.
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