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2)Is it better to pull the engine out or access the timing belt through the wheel-well?
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By now im sure you have addressed the problem but in case anyone else reading this is in a similar quandary, here's my two cents on this very common issue -
There's no reason to pull the engine just to replace the timing belt. The clearance is tight but removing the engine is alot more work, as you can imagine. (If the engine were out of the car for some other reason, i'd just change this belt anyway.) If you DIY you will have some difficult moments perhaps but you can do it, there are several excellent posts here on doing this chore that you may find useful.
I don't know the exchange rate but the parts to do it right would cost about $200 US. If you are tight at the moment and your pulleys and water pump seem like they would probably be ok for a while, just change the belt only, if you must. A toyota belt is like $30 and thats all you'd need to get by for now.
If your timing belt breaks and you can afford to fix it right, change the water pump and idler pulleys at the same time. At the very least you should remove and inspect these parts carefully, by spinning them and feeling for roughness or sticking.
The timing belt can snap for two reasons, firstly it is just frayed and worn out. And second, the water pump or pulleys are worn out, sticking or binding up and this too will snap the belt very quickly. Toyota OEM parts are generally of excellent quality so normally this would not happen for 150,000 - 200,000 miles. But if this is your second timing belt change, i'd be sure to change these parts at all costs.
Even if the timing belt is worn out but has not broken yet, sometimes a few rubber teeth can break off the belt, and this may cause the engine to jump time. If the belt jumps time it could cause an engine performance problem that is hard to track down. And you can wind up replacing a lot of other expensive parts before you find the real issue. Probably a good reason to change the belt on time if you can.
(Image shows V6 timing belt, water pump and idler pulleys)