Had my 2007 Mazda 6 times but had trouble getting bolt out. So without thinking took all the timing stuff out and used air gun and took crank shaft pulley off without thinking. Put pulley back on tried returning it but the crank shaft does a half turn and stops. Before taking crankshaft pulley off I could turn it clock wise and it wouldn't get stuck at all. Anyone have any idea why this would happen? Or what to do about it?