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A timing belt kit — also called a cam belt kit — includes the timing belt itself, the tensioner pulley, idler pulleys, and usually the water pump, providing everything needed for a complete timing belt service in a single purchase. Following the manufacturer's replacement interval is critical: a snapped timing belt typically causes catastrophic engine damage on interference engines.
The timing belt is a toothed rubber belt that synchronises the crankshaft and camshaft(s), ensuring that valves open and close at precisely the right point in the piston's travel. The tensioner pulley maintains correct belt tension throughout its service life. Idler pulleys guide the belt around corners in the drive path. Many kits also include the water pump, since the pump is driven by the timing belt on many engines and replacing it at the same time saves the labour cost of a second job later.
Kits are rated for specific engine codes. Even vehicles of the same make and model year can use different timing arrangements depending on engine variant, so always confirm with the registration lookup rather than assuming all variants match.
Most manufacturers specify a timing belt change at 60,000–100,000 miles or five to seven years, whichever comes first. The time interval is just as important as the mileage — rubber degrades with age even if the belt has not been used much. A vehicle that covers low annual mileage still needs belt replacement on the time-based schedule.
Never extend the interval. The consequences of a timing belt failure on an interference engine (where the valves and pistons share the same space) are severe: bent valves, damaged pistons, and a potentially written-off engine. The cost of a timing belt kit replacement is a fraction of an engine rebuild.
Timing belt replacement requires locking the crankshaft and camshaft(s) at TDC using vehicle-specific timing pins. Using the correct locking tools is essential — improvised methods risk setting the timing off by one tooth, which causes poor running, emissions failures, or further engine damage. After fitting, torque all pulleys to specification and run the engine through several cold-start cycles to verify timing marks align correctly.
Commonly searched OE numbers fitting Timing Belt Kit from the TecDoc catalogue.
Common original equipment numbers linked to stocked alternatives.