If the belt actually broke, then you will need to have headwork, valves, and depending on how bad, pistons. Might be better off swapping another low mileage engine instead of having the work done, unless you can do a lot of it yourself.
I just got done replacing the water pump on an AEG 2.0L. Quite an experience but I was able to do it without any special tools. I ended up having to reset the timing belt and it was not that hard. Here's how:
I was able to get a 19mm socket (3/8" base) wedged between the plastic splash guard and into the crankshaft pulley. I slipped a 3/4"X18" iron pipe over the ratchet handle to get extra leverage and get the handle clear of the engine. Some duct tape on the socket handle and end of the pipe will hold it from slipping. Set the ratchet to tighten so you are turning the crankshaft clockwise as you look at it from the passenger side.
While the belt is off, make sure the crankshaft is NOT at TDC, recommend about a quarter rotation away either direction. There are two ways to identify TDC. The first and easiest is to look straight down on the top of the crankshaft pulley and behind it. On the case, right behind the pulley, you will see a vertical notch. As you rotate the crank, you will see a notch on the behind the pulley. First go through TDC about a quarter rotation so you can set the camshaft without damaging the valves. The throw on the ratchet is small so it may take dozens of throws to get a full turn on the crankshaft but better than trying to pull off the splash guard and crankshaft pulley as described in many other videos and blogs. To verify TDC, you can check the flywheel on the transmission side of the engine. It is hard to see, but there is a rubber oval shaped plug on the top of the tranny bell. You will have to stand on the driver side and probably move some rubber lines out of the way to see it. Just pull on the plug to remove it. There are two holes and you want to look into the larger one closer to the engine (with gears in view). You will have to move around and shine a bright flashlight there to get a good view. At TDC, you will see a 0 mark. For manual tranny, this is lined up directly in the center of the window. For auto, I believe it is lined up on the right edge (recommend research that one as I did a manual).
Next, set the camshaft to TDC by placing the 19mm socket on and lining up the notch on the camshaft pulley with the arrow on the case, again rotating clockwise. Now return to the crankshaft and set it to TDC as described earlier.
Now, the tensioner should be set to the lowest setting. I was able to use a long standard screwdriver to push on the eccentric cam in the center instead of buying the special tool or using the 90 deg needle nose (since I don't have one). Basically, you will see a flat spot on the cam on either side of the nut which the screwdriver tip can push on to align the cam as needed. With the cam 180 away from the belt (least tension), ensure the belt is seated on the crankshaft timing belt gear and over the water pump gear. With the belt over the tensioner, take out any slack and line the teeth of the belt up on the cam pulley. To get the belt on the rest of the way, work the edge of the belt over the cam pulley little by little until the edge of the belt is on top of the pulley. It might take some pulling but DO NOT move the cam pulley or the crank pulley during the process. Center up the belt on the cam and water pump pulleys.
Next, set the tension by pushing on the left side of the cam with the long standard screwdriver. Reach around the back of the left side of the tensioner as you do this and you will feel a lever move clockwise the harder you push. You will also feel an indexer at about the 10 o'clock position. The goal is to push on the cam with the screwdriver until the tension lever moves up to the indexer. Then tighten the 13mm nut on the tensioner. Once it is tight, double check the lever is still lined up with the indexer by feeling behind the tensioner.
I you want, rotate the crank through a rotation to check nothing is binding. You have now set the timing.
I also ran the engine for just a few seconds to make sure all was right. I'll post more lessons learned on the water pump!
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