Clunk noise releasing clutch or accelerator pedal

blob84

Member
Hi,

I could not find the same issue in the forum so I've thought I should post here.

My T28 102 Trandline swb (T6) 65 plate with 81k does a clunk noise when I release the clutch (all gears but more noticeable in 3rd an so on) as well as when I release the accelerator pedal. I can hear it if the window is open.

New clutch and dual mass fitted at 79.6k by the last owner (including Cambelt and water pump).

The van drives very well, quite happy with it but this noise just bother me.

Any idea before I get it to a garage? Transmission issue?

Thanks in advance
 

Howzat

Senior Member
T6 Guru
Don't have an answer for you but mine clicks (rather than clunks) when lifting the clutch occasionally and like you I only notice it when the window is open so I'll be interested to hear the outcome of your investigation.
 

blob84

Member
Ok .. could not wait and put my head underneath on the driverside and there is a leaking (couldn't fine any trace on the driveway previously) that seems coming from the driveshaft...greenish

CV boots looks "ok" and not damaged...

Could be the driveshaft star failing and making that noise?

20210705_105242.jpg20210705_105231.jpg
 

DXX

Senior Member
VIP Member
T6 Legend
I think you’ll find the outer cv boot has a small split, that grease has been leaking out for a while.
Best to clean the whole area with de-greaser, drive a few miles and check again.
 

DXX

Senior Member
VIP Member
T6 Legend
So perhaps it has been loosing grease and so the noise appeared (hopefully not major failure)
Almost certainly a CV joint failure but clean it, drive and re-check for grease spillage.
On some vehicles it’s possible to remove the outer joint by positioning at full lock, not sure about a Transporter.
 

Howzat

Senior Member
T6 Guru
With the noise and all that grease I'd be straight round to my mechanic before driving for much longer and risking a more expensive repair. Good luck.
 

blob84

Member
Thank guys

I have booked the van in for the earliest appointment (15th of July) for the CV joint and boot replacement (VW authorized garage).

I have been quoted 180 bucks for it, how does it sound?

No van for the weekend :(

Cheers
 

DXX

Senior Member
VIP Member
T6 Legend
Thank guys

I have booked the van in for the earliest appointment (15th of July) for the CV joint and boot replacement (VW authorized garage).

I have been quoted 180 bucks for it, how does it sound?

No van for the weekend :(

Cheers
Euro Car Parts outer CV joint with discount is £40 (pattern part), not sure if this includes the boot.
I’ve had good and bad experiences with pattern part CV joints, some are re-ground but the case hardening is not re-worked so soft as chocolate for the want of a better word. The two I have on my car now were about £12 each and have been there years so it’s a case of suck it and see.
I remember somebody telling me that the T5 had issues with failing drive shaft splines, not sure if this is any different on a T6.
Anyway let us know what’s found.
 

blob84

Member
UPDATE

The driver side cv joint was replaced along with the boot as for the booking.

However, the noise has not gone. If for one hand I'm happy to have replaced that faulty part, I cannot get a quite sleeping without solving this issue.

The mechanic who changed the parts did not noticed any issue.

What else could be?

-Egine supporst? (Not sure about this)
-Gear box bearings? (somebody suggested this..)

Perhaps an option would be to have a proper test drive with an VW expert along.
 

DXX

Senior Member
VIP Member
T6 Legend
UPDATE

The driver side cv joint was replaced along with the boot as for the booking.

However, the noise has not gone. If for one hand I'm happy to have replaced that faulty part, I cannot get a quite sleeping without solving this issue.

The mechanic who changed the parts did not noticed any issue.

What else could be?

-Egine supporst? (Not sure about this)
-Gear box bearings? (somebody suggested this..)

Perhaps an option would be to have a proper test drive with an VW expert along.
If they smashed the CV joint into the gearbox with a hammer who know what’s been affected. The dents didn’t look like a couple of light taps.
I hope you have photos and emails with the Garage admitting their error, something to fall back on later if needed.
 

blob84

Member
If they smashed the CV joint into the gearbox with a hammer who know what’s been affected. The dents didn’t look like a couple of light taps.
I hope you have photos and emails with the Garage admitting their error, something to fall back on later if needed.
So, do you think the garage haven't done what they supposed to do or (even worse) further damaged it?

I've got the old cv joint and boot with an evident split/cut on it but I haven't check the joint yet (not sure if can understand if it was badly damaged)
 

Howzat

Senior Member
T6 Guru
There's another thread with a similar sounding issue and the guy found a way to replicate the sound while the van wheels are off the floor here which may be handy for a mechanic to source the problem. Mine is due for work early next month so if I get to the bottom of my similar sounding issue I'll post back.
 

DXX

Senior Member
VIP Member
T6 Legend
So, do you think the garage haven't done what they supposed to do or (even worse) further damaged it?

I've got the old cv joint and boot with an evident split/cut on it but I haven't check the joint yet (not sure if can understand if it was badly damaged)
A worn CV joint noise will increase as the amount of angle is a increased. Outer CV joint when steering is in full lock is a good indication.
Inner CV joints usually last much longer unless the boot is split. In fact I can’t remember ever having one fail on any of my vehicles.
If it’s a CV joint it is audible as a loud click.
In the past with poor judgement I drove on one until it physically locked up, my advice is don’t do this. The only way I got it free was to jack the car up and let the suspension sag.
@Howzat has made a good suggestion by getting both wheels off the ground on stands and try to diagnose, at least get a ball park area where the noise is coming from.
You could then try switching left and right drive shaft positions and see if the noise remains in the same place. If it does it isn’t the drive shaft / CV joints.
More labour but no parts consumed.
 

Howzat

Senior Member
T6 Guru
I might be wrong here which wouldn't be the first time but I think the CV is a red herring as the noise was happening prior to any work being done and remains after the CV has been fixed. I'm fairly certain mine is somewhere in the clutch-gearbox-driveshaft region which doesn't narrow it down much. Would really need to get underneath when it's up on ramps while someone tries to rock the wheels in gear to get a better idea.
I normally hear it when driving past a wall or house with the passenger window open. Can't hear it inside the van or feel it through the floor like you normally do when steering components fail. Anyhows talk is cheap so I'll update when I have something more concrete to add.
 
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