BillBoost37

2010 A6 3.0T with 95K on the clock. It's new to me and felt great when test driving/buying. In the last couple of days I have a clunk when putting it in gear or moving between D and R. I am thinking it's a motor mount. Having never diagnosed one on an Audi, what your experiences are with them?

Meaning, are they so solid that it'll never be the engine mount and it's like X item. Or, they are common enough and there's a different one that most people replace theirs with.

Thanks

KevinGary

I had to have the motor mounts replaced on my old C6, so they are not bullet proof. Certainly what you are describing are the same symptoms that I had prior to replacing the mounts. Replacing the mounts fixed my issue.

BillBoost37

Did you find it difficult to replace them?

Thanks

KevinGary

The dealer did it, so it was very easy. Lol. Let me see if I can dig up my cost records and you can guess on the labor amount.

KevinGary

I don't have much on specifics, but here is what I do have:

103,924 Miles $1,191.74
1) 105,000 mile service
2) replace passenger tailight assembly
3) replace right side motor mount

BillBoost37

Thank you, that's not too bad of a cost at all. I looked into the cost of a mount yesterday and assume the tail is in the same ballpark would put the labor cost low.

Now to have a buddy help me diagnose it. Because it is difficult to watch the motor while shifting at the same time.

I appreciate the info, thanks

StarkNaked

I just bought a 2007 A6, and what I was told was that this model has electrically controlled hydraulic motor mounts. If they start leaking fluid, they need replacement. I was quoted $370 installed for the drivers side mount.

Mr. Bizzle

Electrically controlled hydraulic motor mounts?? Whatever happened to a good old fashioned rubber bushing?? I am curious as to how those work...

haloguy628

Yes, majority of modern cars have hydraulic motor mounts. Here are the locations. Just get underneath and see if you see fluid leaking.




2009 Audi A6 3.0T Left Engine Mount





2009 Audi A6 3.0T Right Engine Mount

SchwarzS6

Copied from another forum. This should answer your question.

"the way the mounts work is that there is a fluid chamber with a plastic body in the middle of it, with small channel cut through it. this allows fluid from the top chamber, through the plastic body, to the bottom chamber. the bottom chamber is rubber lined and can deform under pressure. there is also an airway vented to atmosphere, with a rubber membrane separating the fluid from the atmosphere. a solenoid valve, controlled by the motronic, can open or close the airway.

below 1100 rpm (i.e idle), the engine vibrations are not enough to force fluid from the top chamber, through the passageway to the bottom chamber. the airway is open (solenoid valve open). the rubber membrane creates a soft cushion which absorbs the high frequency vibrations.

above 1100 rpm the soleniod valve is closed which blocks the airway and so "hardens" the mount (the fluid has nowhere to go). thus the mount is effectively solid.

the high frequency vibrations at speed are absorbed by the membrane (as in the idle case), while the more damaging low frequency vibrations cause the fluid to force itself through the chamber in the plastic body to the lower chamber, forcing the (lower) rubber chamber to distort - effectively absorbing the vibrations."