Timing belt is a wearing parts, and timing belt once broken, the camshaft of course will not run according to the timing, this time is likely to cause the valve and the piston hit and cause serious damage, so the timing belt must be based on the original Factory designated mileage or time replacement.
During the operation of the automobile engine, four processes of air intake, compression, explosion and exhaust are continuously generated in the cylinder, and the timing of each step is matched with the movement state and position of the piston so that the intake and exhaust and Pistons lift up and down coordination, timing belt in the engine which played a "bridge" role in the crankshaft driven by the power to the corresponding parts. There are many high-end cars to ensure that the timing system is stable, the use of metal chain to replace the belt. As the vehicle timing tooth belt fracture will cause damage to the engine inside the valve, the greater the harm, so the general manufacturers have a timing belt replacement cycle.
Timing belt is rubber parts, with the engine working hours increase, timing belt and timing belt attachments, such as timing belt tensioners, timing belt tensioners and pumps, etc. are subject to wear or aging. Therefore, all equipped with timing belt engine, manufacturers will have strict requirements in the specified period of regular replacement timing belt and accessories, replacement cycle with the engine structure is different, generally in the vehicle to 6 Million to 100,000 km should be replaced, the specific replacement cycle should be based on vehicle maintenance manual instructions.
Timing belt is generally considered to be replaced at 80,000 km. Even if you have a timing belt on the car, in the event of its break, they can not be replaced. Therefore, when the total travel distance to 80,000, it is recommended to consider the replacement. The timing belt is behind the tank fan.