You need to keep the crank from turning so that you can unscrew the bolt that holds the pulley on. Torqued to 170 ft lbs, I believe. There is a hex shaped "key" that fits inside the pulley, and you brace this with a 1/2" socket against the front mount. Then you take your breaker bar with a 5' floor jack handle over it and unscrew that bolt. Then you can pull the pulley off, its keyed, don't worry about marking it, and then remove the lower timing belt cover that will be partially glued on with the melted insulation from the crank sensor. Remove belt, change water pump, and reinstall everything. Earlier steps will include removing all 3 drive belts and one of the tensioners. Also, remove throttle body and set aside for better access. Read the manual to reinstall timing belt correctly-their procedure to install and tension works well.
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