NEED HELP PLEASE ..My timing belt broke on my 2003 a6 quattro 3.0 , can any one tell me how to reset the timing after the belt broke.

 

These are interference engines. You have bent valves. The heads will have to come off and bent valves (there will be several) have to be replaced first. THEN you can put a new timing belt on it. I also recommend you replace the waterpump while you're in there. An extra $30-$40 isn't going to matter. Another thing I recommend replacing is the variable cam timing adjuster pads that the cam chains ride on and all associated gaskets. Bluaparts carries complete kits and a couple of handy tools for doing this. Especially since you're going to have the head off the engine, you cannot get in any easier conditions to replace them since you're going to have to take the cams out of the head to remove any bent valves. Be sure to check for any damage (cracks) in the valve guides where they enter the intake and exhaust runners on any of the valves that were bent. Sometimes they can crack along the ends and you risk a chunk falling off later. While this isn't too critical on the exhaust side, it will get sucked into the cylinder on the intake side. This is never a good thing for rod bearings..

 

Keep in mind too that if you're not doing this work yourself, the costs associated may be higher than just replacing the engine with a used one from a donor car. Dave is right on every part listed needing to be replaced, and I'll add also that depending on the impact severity, you may have piston damage as well.

 

I doubt that there is any piston damage as small as the valves are on these engines. Unless you've dropped a valve (you know what that does) rebuilding the head is usually the only thing you need to do. Unless you were turning some ungodly RPM's (racing) at the time, you generally don't have any bottom end damage. I've snapped the timing belt on my 8 valve 944 twice (roller and idler failures both times) and never had any bottom end damage. The first break was 200K miles ago.

 

I'm not talking about broken or cracked pistons, but scoring is possible, creating edges and high spots that can cause detonation if they aren't sanded down. I've seen this happen more than once. It's still more labor and cost to consider.

 

Of course that can occur.. I usually bring the piston up to TDC on that cylinder and clean up any marks if they're very noticeable. Since you're going to have the head off anyway..