I have a 1985 kc for laser 1.6lt automatic i put in a good second hand motor 6 months ago since put in i have snapped 4 fan belts. It has a new alternator water pump and i changed the crankshaft pully of the motor that blew up. when i put on a new belt rev the engine to approx 2000rpm the markings on the belt the line on it seems to be moving side to side . The deflection tension of the belt is the thickness of the belt
12mm approx. The only thing it could be is a warped water pump pully????????? any suggestions would be much appreciated "o" when i put the new belt on drove 75kms got home and started squealing again HMMMMMM!!!!