The engine timing belt also called a toothed belt, The crankshaft and camshaft are connected by the above tooth groove. We know that the engine is in normal and stable work, the movement of the piston position, the valve open and close time, fuel injection and ignition time must be synchronized, and this is accomplished through the timing belt, you can use the Auto Diagnostic Tool to check the timing belt working performance.

Timing belt belongs to the rubber parts, with the increase of engine working time, timing belt and timing belt accessories, such as timing belt tensioner and pumps will wear or aging. If can cause the vehicle broke down after fracture belt, the engine internal valve damage, serious can cause the abandonment of cylinder cover. Not only to spend more, but also a long time to repair. Therefore, we need to use the Launch Diagnostic Tool or Autel Diagnostic Tool regularly to check and maintain the timing belt.

Check automobile engine belt consists of two elements:
First, check the belt tension, then you can use the thumb, strongly pressed the middle two belt pulleys. The pressing force of about 10kg, if the reduction of the belt is about 10mm, is considered proper belt tension exactly. If excessive pressure is considered insufficient belt tension. If the belt hardly occurs reduction is considered excessive belt tension. When the lack of tension, the belt is prone to slipping. The tension is too large, it is easy to damage various auxiliary bearings. For this reason, it should be related to the adjusting nut or bolt loosen the belt tension adjustment to the best state.

In addition, it must be noted that the wear of the belt. Old belt badly worn, the belt and pulley contact area dropped. Then as long as the force of a press belt, the belt will sink deep into the pulley groove. If the belt rubber is aging, must promptly replace the new belt.

Xtool PS2 or Autoboss V30 SPX tool inspection data show that cars generally every 80,000 km replace the timing belt; five-valve cars are generally replaced every 60,000 kilometers per timing belt. It should be noted when replacing the timing belt, appendages such as tension pulley, water pump should be replaced together.

Source: http://www.focalobd.com/blog/automotive-timing-belt-function-and-check-methods/

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