The timing belt is not broken, it does not mean that it is no problem. As the belt is used more and more old, it tends to stretch beyond the range that the tensioning device can compensate, thus producing a timing sprocket slip. The wear of the teeth and the adhesion of lubricating oil can also cause slippage. During the inspection, if the belt has a decrease in hardness, abrasion, fiber breakage, or cracks or cracks, it indicates that the belt is damaged and cannot be used any more. Next, check the sprocket fault. Damaged sprockets can “burn out” belt material and exacerbate belt tooth wear. A sprocket failure can also cause the valve train to create greater resistance to the timing belt.
For engines equipped with timing belts, manufacturers will have strict requirements and will be replaced periodically during the specified period.
Timing belts and accessories, the replacement cycle varies with the structure of the engine, generally should be replaced when the vehicle travels 60,000 to 100,000 km, the specific replacement cycle should be based on the vehicle's maintenance manual.