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The belt is worn out and is disintegrating. It has probably jumped time. The reason the engine won't start. Depending on your car, Some engines are no tolerance. Meaning if you keep cranking it and the belt breaks, the pistons can slap the valves, bending or breaking them. Replace the belt.
If you did not set the gears(pulleys) in the same place or set the marks in the timing belt to the marks in the gears the car wont start. when you do the the job is when you set the timing, not after you done. If you use a cheap timing belt those belts do not have marks, I recommend to get a belt from toyota that has a mark for each cam pulley and another mark for the crank pulley. Toyota doesn't have interference engines, so no matter how bad is your timing the car wont start just spin.
If the timing belt became chewed up it would seem the belt/timing has slipped (do not try starting it like this bad things could happen) You'll need to replace the timing belt, tensioner and insure the proper mechanical timing is done for it to run properly if at all. If the belt failed at highway speed and it has a interference fit engine this would mean a valve or two may be bent too. I'd check the timing and once this is corrected I'd checking cylinder compression.
I hope this may have helped,
Tom
Hi, You need to get your timing belt checked. Dont attempt to start the engine until your timing pullys are reset because if your cam is set wrong it WILL cause valve damage.If it is allready correctly set then i suggest you test the compresion in case damage was caused when belt was fitted. Hope all works out ok 4 you.All the best.Phil
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