Rumble coming through clutch pedal and back of engine when changing gears

**simonrk57** · 25-02-2013,11:07 PM

Hi all,

I have just chopped in my B7 A4 for a 54 plate A6 2.0ltr TDI SE.

So far so good and it is lovely to drive (although a bit slower than my A4

)

The only problem is when I pull away, depress the clutch to change gear and let the revs fall, there is a very noticeable knocking/rumble coming from the back of the engine/through the clutch pedal.

It is incredibly annoying and concerning.. Anyone know what it could be?

Worth mentioning, there is absolutely no slip

Bump??

**NickPicks** · 26-02-2013,10:35 AM

Simon. Are you sure yours is a C5 A6? I thought the 2.0 tdis were only introduced in the C6 models.

I'd suspect the clutch release bearing is knocking, and I'd worry that it might be the DMF, and I'd hope that someone like crasher would be along soon to advise.

**simonrk57** · 26-02-2013,10:58 AM

Hi,

No I am not convinced. It could be a C6 but cant seem to find the answer.

I am worried its the DMF too. £900 all in including clutch!

I am thinking of buying the parts from GSF and doing it myself.

Any thoughts on that? Thanks for your input.

**NickPicks** · 26-02-2013,01:01 PM

Originally Posted by simonrk57

No I am not convinced. It could be a C6 but cant seem to find the answer.

Look at the rear numberplate. If it's in a black area with 2 red foglight spaces above it, it's a C5:
prs92_NZ_Max_Machine_ZZ.jpg

If it's just paintwork around it, it's a C6

audi_a6_09_chrome_trunk_trim_before.jpg

**simonrk57** · 26-02-2013,01:15 PM

Its a C6 then.

**simonrk57** · 26-02-2013,01:16 PM

IMG_2312.jpg

**Guest 2** · 26-02-2013,01:21 PM

C6 - ill move this to the c6 section

Sent from my iPhone using Tapatalk 2

**Eshrules** · 26-02-2013,01:27 PM

Originally Posted by simonrk57

Hi all,

I have just chopped in my B7 A4 for a 54 plate A6 2.0ltr TDI SE.

So far so good and it is lovely to drive (although a bit slower than my A4)

The only problem is when I pull away, depress the clutch to change gear and let the revs fall, there is a very noticeable knocking/rumble coming from the back of the engine/through the clutch pedal.

It is incredibly annoying and concerning.. Anyone know what it could be?

Worth mentioning, there is absolutely no slip

Bump??

1) Was this fault/noise present during the test drive?
2) How has the supplying dealer responded?

**simonrk57** · 26-02-2013,01:34 PM

No not that I could hear and it was a private sale..

Does it sound like the DMF?

**rafletcher** · 26-02-2013,02:08 PM

Rumbling on depressing the clutch, I'd guess release bearing, judder when engaging clutch DMF failing. FWIW you could fit a solid flywheel, but that may (by passing through theengine vibrations and not damping them as a DMF does) stress other parts of the transmission, allegedly. However as you can remap for 25-30% extra power without damaging the transmission, I'm not convinced.