Clunk noise after cv joint replacement

[Jepor]

Hey all 

I have an 2015 audi a6 c7 auto s tronic 7 speed , yesterday I got the passenger side outer  cv joint replaced,  it sorted out the usual cv joint symptom of clicking when turning.  Today I noticed something strange , when I put the car and reverse and accelerate the is a clunk noise  only once , it then does it when I stop and go into drive , again one singal clunk . The car is driving perfect it's just the signal clunk on initial take off either in drive or reverse.  Have to wait to go back to garage . Could it be backlash.  It's only come since the cv joint was replaced . Sounds harmless but nervous that it's doing damage . 

Has anybody experienced this before ? 

 it's like a singal metallic clunk in drive and reverse , nothing while driving after initial acceleration .

 

Thanks 

 

 

[spartacus 68]

You’re right to flag it. Something isn’t sitting right once the suspension or brakes were reassembled A single clunk could be pads moving in the brake carrier. Were the garage lazy and simply buzzed it back on? A strip down, blow out with compressed air and light smear of ceramic grease would bed everything in. The final torque on the hub bolt is with the wheel still raised, and there’s a sequence. Any other associated suspension links that were dismantled should be checked too.

[Jepor]

Luckily it's going into gear ok so don't think it's the gearbox , it's seems to be when I start to move while in drive or reverse,  so it feels to me like something lose and knocking,  im starting to think about lose driveshaft bolt . 

[cliffcoggin]

John.

You have only done one CV joint so I would suspect the other side also needs to be changed. They tend to wear out at the same rate.

[Magnet]

Hello John,

’I got the passenger side … joint replaced’.

My advice would be to take it back to whoever fitted it - don’t fiddle with it, don’t try to self diagnose it - but take it back ASAP.

Please let us know how you get on.

Kind regards,

Gareth. 

[Jepor]

Thanks for replies ,

going back to garage today , think it's just the way the drive shaft was reassembled after changing the cv joint . It's only happening on initial movement back and forward . No sound actually going into gear .

[Jepor]

UPDATE :

took the car back to garage , they took everything apart and retightened all the bolts on the inner cv joint and also the cv hub nut , Absolutely no movement on inner joint . Unfortunately the noise still there , on the plus side it's definitely coming from the wheel area not the gearbox , it's there when put the car  into drive or reverse and accelerate hard . So at least he was able repeat the sound  . He reckons it must be a faulty part out of box , he reckons theres movement on the spline when accelerating,  he has ordered a new part and will fit next week when it comes under warranty , he says it's perfectly safe to drive until then .

Hoping the new part will solve the problem , he's says that's all it can be as that's all that was changed on the car . 

It's an SFK cv joint not sure how good they are but he says they are very good parts  . 

[Jepor]

Just another enquire , my mechanic is convinced it's the outer cv joint making the knocking noise when accelerating,  but everything iv read on the web suggests that this knocking  is the inner joint not the outer , can anybody tell me can an outer joint cause this singal knock when accelerating? 

Don't want to have to go back again if it was the inner after all this.  

[Jepor]

He also doesn't want to change the whole driveshaft he says there's no need. 

His logic is the only thing that was changed before the knock came was outer cv joint , so it's obviously the outer thats the problem . 

Has he a point or am I being paranoid?

[cliffcoggin]

So do you trust Mr. Google or do you trust your mechanic? In your position I would go elswhere.

[Jepor]

I suppose my mechanic who's working at it 40 years knows more , also he's covering the cost of the replacement cv joint so not going elsewhere , I can just try the outer and if still knocking i have lost nothing,  then move onto inner . 

My question is can the outer cause this knock noise ? I thought it would just be a clicking while turning . 

[cliffcoggin]

4 minutes ago, Jepor said:

My question is can the outer cause this knock noise ? I thought it would just be a clicking while turning . 

No, it can knock in the straight ahead position, though it is always worse when turning.

[Jepor]

Oh ok thanks , I took it to him with a clicking when turning left , got it back and the clicking was gone , but now have the single knock when initial acceleration in drive and reverse . So hopefully the 2nd new outer cv joint will fix this . 

[spartacus 68]

SKF is a quality part. Stick with your mechanic, if you trust them, then that counts for a lot. I’m sure you’ll get to the bottom of it.

[eric-audi-a6]

I have exact the same issue but only when out in reverse after a long drive. Single clank noise from wheel and that's all. Can this be the arm/wishbone ? Has yours been resolved now? If so what was it ? Thanks. 

[Jepor]

Yes its resolved,  they replaced the outer  cv joint again , they think the 1st one was faulty out of the box . 

 

Regards 

[Jepor]

But unfortunately the wheel bearing on the side has gone bad in the 2 weeks since the cv joint was changed,  coincidence or was damaged during the cv joint saga , either way its going in for a new wheel bearing tomorrow.  The joys of a 10 year old A6 !!! 

 

Regards 

[spartacus 68]

Make sure the fit a F.A.G. Bearing. Basically fit and forget. Car parts are not what they used to be, so cheap parts reveal themselves prematurely with normal wear and tear.

[Jepor]

2 hours ago, spartacus 68 said:

Make sure the fit a F.A.G. Bearing. Basically fit and forget. Car parts are not what they used to be, so cheap parts reveal themselves prematurely with normal wear and tear.

There's a SKF bearing going in , one was put in on other side 55k ago and still perfect.  

 

[Jepor]

My concern was did the bearing fail over working on the cv joint , or did they damage it doing the cv , is this a common,  should the bearing and cv be done together 

[cliffcoggin]

2 hours ago, spartacus 68 said:

Make sure the fit a F.A.G. Bearing. 

Does that mean the bean counters have been working at at SKF and Timken? I've not heard of F. A. G.

Edited 3 hours ago by cliffcoggin
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