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Helo,
I have a 97 tdi a4, and recently had to get a 99 ahu engine fitted as the timming belt snapped!
Everything was going well untill the other day a bad knocking sound started to come from the engine. when looking for the cause of the noise i noticed that the centre pulley (I think it is the water pump?) looked like there was a bit of wobble in it. Could this leave the engine sound like an old cement mixer?
Can anybody help.
 

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The noise could be coming from several sources from what you have described. Best advice I could offer would be to go see the shop that installed your replacement engine. They might fix whatever is wrong based on their warranty (if any).

Good luck.
 
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