I believe the bolt is 19mm. and the pulley is 50 or 55mm it depends of the model. You have to get the correct special wrench. There are other method to get it out, but in my opion it will ruin the timing belt. To lose it, hold the special wrench and turn counterclockwise the 19mm wrench. If it's hard use long pipe. I just did it and very easy. good luck!
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