A4 Avant B8.5,2012,105kW,2.0 TDI, 200000km

[Marko C94]

Hello guys,

 

I know there is a very slim chance of finding the root cause of this shaking on forum, but maybe someone managed to solve this issue. First of all, car is super reliable ,extremly well maintained and I'm super happy with it. But this is starting to really frustrate me. I have been to two really proffesional vag specialists and they couldnt find anything. Car is currently on 200003km, shaking started at around 170000km.. shaking comes only when accelarating, it goes through the car, and is stronger when you accelerate from low rpms.. shaking is also stronger in higher gear(accelerating in6th gear from low rpm is strongest, gear lever goes crazy)

So far changed inner and outer cvs, both driveshafts(all original parts), engine mounts , and my flywheel and clutch are in very good condition(there is absolutly no sound whatsoever).. there in no misfire, i even had.my gearbox opened and all joints look factory new.. i have a feeling this is something bizzare , and yet i cant figure out what it is.. 

[RoyC]

harmonic balancer

[Marko C94]

42 minutes ago, RoyC said:

harmonic balancer

Hm, interesting idea, makes sense.. had a similar problem? Thank you for the reply, really apreciate it...

 

[Stevey Y]

10 hours ago, RoyC said:

harmonic balancer

Hi also known as a crankshaft pulley.

[Marko C94]

17 minutes ago, Stevey Y said:

Hi also known as a 

17 minutes ago, Stevey Y said:

Hi also known as a crankshaft pulley.

 

Thank you for the reply? How can i test if it is really crankshaft pulley, and is that problem something common in 2.0TDI?

[Stevey Y]

On 7/29/2022 at 10:01 PM, Marko C94 said:

Thank you for the reply? How can i test if it is really crankshaft pulley, and is that problem something common in 2.0TDI?

Hi with that sort of milage it should have been changed about 100k ago, there is no way of testing them other than with a crowbar underneath them to see if it moves up and down but considering the price of a new one just changing it would be better policy, the outer ring of the pulley is bonded to the inner with high shore rubber which when it deteriorates allows movement/vibration, the DMF and crank damper are there to stop harmonic resonance which occurs around 1800-2000 rpm.

Steve.

[Marko C94]

2 hours ago, Stevey Y said:

Hi with that sort of milage it should have been changed about 100k ago, there is no way of testing them other than with a crowbar underneath them to see if it moves up and down but considering the price of a new one just changing it would be better policy, the outer ring of the pulley is bonded to the inner with high shore rubber which when it deteriorates allows movement/vibration, the DMF and crank damper are there to stop harmonic resonance which occurs around 1800-2000 rpm.

Steve.

Thank you steve, i have oil and filter change next week so will change balancer too.. i will post back here if that solved the issue, maybe it will be useful to someone!

[Marko C94]

For everyone following, swaped all my engine mounts, everything still the same.. i think i will go with a flywheel.. if that doesnt sort things out, i give up lol

[Marko C94]

And btw, pulley is alwmost brand new, swapped when i did large service, it defo not a pulley..