Mine failed at 105k miles and my mechanic said he thinks the valves are bent as well. The issue appeared one evening when the car had trouble starting, was shaking a lot, and couldn’t even make it down the block. The cost to pull apart the engine, replace the valves, and replace the timing chain is expected to cost $5000-6000.
Looks like my air pump is going or blew a fuse. I didnt see it in the service manual for recommended times. I'm at 150k miles and nothing has exploded just yet ( knock on wood) I had the tensioners done. $4400 at the dealership. 2013 with 95k. Found out around 88k and was fine except for the occasional rattle.
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I have heard it is expensive also, since they have to pull the motor and transmission to replace. Cheers, Chuck. Yes, the motor and tranny do have to come out. On our cars the timing chain is at the back of the engine so therefore to get to it everything has to come out. And yes, timing chains should not got out at 75 or even 150.
1. S4 (B8 Platform) Discussion - 2012 S4 in car timing tensioner replacement - I experienced this issue after replacing the top tensioners in car but I could not get to the crank locking pin. Well its after 9 pm central and I am feeling whipped!! I also am OCD in ways as I have been wrenching 40 years but have not
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audi s4 b8 timing chain replacement cost