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Because the crank gear is held in time by the use of friction washers and the pressure of the crank pulley. If you remove the crank bolt without the cams and the crank located in the correct spot and held with the holding tools the cams can rotate separately from the crank. The crank pulley also has the tone wheel for the crank position sensor on it so if the crank pulley is not place correctly on the crankshaft it will not start.
 
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