Description

Timing pulleys are specialized pulleys that have either teeth or pockets around the outside diameter of the pulley body. Timing teeth engage holes in the metal belt, while timing pockets engage drive lugs on a belt's inner circumference. These teeth or pockets are used only for timing, not for power transmission. Timing belt pitch is the distance in millimeters and/or inches between two adjacent tooth centers as measured on the pitch line of the timing belt. The timing chain normally needs to be replaced between 40,000 and 100,000 miles unless there is a problem.