Basically, all modern engines have a gear rubber belt in the drive of the gas distribution mechanism, which replaced the metal multi -row chain. In the article we will talk about how to choose a drive belt (timing).
Characteristics and advantages of the drive belt in the drive of the gas distribution mechanism predetermined the widespread distribution of belt transmission. The benefits of the belt:
The ease and small thickness of the belt, combined with high strength, allow them to be used on high -speed engines and distance, which is poorly possible for chain gears that do not guarantee in this case the necessary synchronism. So, it is profitable to use the belt in the drive of the upper shafts in V-shaped engines;
The power frame of the belt is not made stretch, which leads to the fact that the belt frame is not attracted during operation and does not require adjustment;
Due to the flexibility of the pulley belt in power transmission, you can make smaller sizes than the stars in the chain gear, while retaining the gear ratio;
The belt does not require lubrication, and thanks to a small clearance in the hook and elasticity of the belt, the noise of the engine sharply decreases;
The belt can operate with a slight initial tension, which greatly facilitates the work of the bearings and extends their service life. Among the Russian belt drives, the VAZ-2105, -08, Oka, Tavria have VAZ-2105. On the “VAZ-2105” and on the first batches of cars with belts with semicircular teeth.
Naturally, very stringent requirements for the accuracy of size, heat and frost resistance, oil and resistance, and especially the ability to develop the established resource are presented to the timing belts. The breaks of the belt paralyzes the machine, and on the VAZ-2108 engine, valves breakdown are also possible due to a blow to the piston. Other engines provide insurance in the form of grooves in the bottom of the piston. Naturally, the most modern technology should be applied in the production of belts.
If the belt break off on the VAZ-2108 (engine 1300 cubic meters. cm), it is likely that the inlet valves are bent. In this case, after installing a new belt, it is necessary, turning the crankshaft manually, it will be convinced of the presence of compression in all cylinders.
The characteristics of the timing belt belt is that detail that is desirable to always have with you in stock. However, if there is no spare belt, and some teeth are cut off on the worker, then you can get out of the position by cutting, very carefully, a belt into two parts and putting them on the pulleys so that the damaged areas are in the opposite sides. On this composite belt you can get to the workshop or store. Naturally, when installing the belt, you need to correctly install each other distribution and crankshaft.