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How often should the timing belt and chain be replaced?

Timing system is the manager of engine operation rules. Timing belt and timing chain play an important role in the timing system and are important components of the normal operation of the engine.

Although the working environment and materials of belt and chain are different, there is no difference in working principle and function.

Only because of the different operating environment and materials used, the replacement cycle is different.

I think: in view of the importance of timing belts and chains, inspection and replacement are particularly important. It is necessary to refer to the manufacturer's manual and make a comprehensive judgment based on the actual use of the vehicle.

Advantages and disadvantages of timing belt and timing chain

With the development of automobile industry and the improvement of technical level of some important systems, we have more choices.

1. Timing chain is less risky than belt.

Nowadays, timing chains are used more and more. As advertised by the manufacturer, it is generally maintenance-free for life, and there is basically no risk of damage.

Relatively speaking, with the passage of time, the timing belt will inevitably age and crack, which is prone to the risk of fracture. , must be replaced regularly.

2. The manufacturing and maintenance cost of synchronous belt is lower than that of chain.

Because of the different raw materials, the manufacturing cost and maintenance cost of metal and rubber are obviously higher than that of synchronous belt.

In addition, because the timing chain needs constant lubrication in operation, it may leak oil in long-term operation, which also increases the maintenance cost.

3. The timing belt is quieter than the timing chain.

The synchronous belt is light in weight and low in transmission resistance, and the friction between rubber and metal will not produce obvious noise.

However, because the timing chain is a metal product, it needs to contact with the pulley when driving, and the metal-to-metal transmission will inevitably produce loud noise and poor comfort experience.

Harm of timing belt and chain breakage

1. will cause the engine valve and ignition system to fail to work and operate normally.

2. The piston will move up and down due to inertia, resulting in the bending of the valve ejector rod and the depression of the piston top position.

3. When the situation is serious, the engine will be scrapped directly and cannot be used.

In view of this, it is very important to check and replace the timing belt and chain in time, especially the timing belt.

Self-checking method of timing belt

1. Disconnect the negative and positive terminals of the battery.

2. Disconnect the generator wire plug, remove the cylinder head cover, and then remove the timing belt upper cover.

3. Turn the crankshaft pulley, check the belt for cracks, oil stains and stains, and thoroughly remove them; Check for wear.

Matters needing attention in replacement

1. In general, the time and mileage specified by the manufacturer are the main ones, and it needs to be replaced after 6 years or 60,000-80,000 km (different brands may have differences), whichever comes first.

Of course, in real life, the environment, region and climate of everyone's car are different, and the condition and maintenance degree of the car are different, so the replacement cycle also needs to be considered.

2. Don't take risks. Timing system is a precise mechanical movement. Once the belt breaks, it will cause system disorder and chaotic operation, and the consequences can be imagined. If necessary, it must be replaced without any carelessness.

3. Belt tightness adjustment. The belt is too tight, the tension is too great, and it is easy to break, which affects the service life; Too loose, abnormal sound, easy to slip, car shake, weak oil supply, increased fuel consumption, etc.

Static detection: By adjusting the hexagon wrench, the belt has a looseness of 10mm and can be rotated 90 degrees.

Dynamic detection: the engine has no abnormal sound and the sealing performance is the best.

Write it at the end

The importance of timing belt and timing chain need not be described in detail. It can be seen that timing belt is more prone to aging and wear than timing chain, and it needs to be replaced more.

The replacement cycle needs to be judged according to the manufacturer's instructions and the actual situation of the car. When it needs to be replaced, we should be resolute and decisive, and we should not take chances, otherwise the loss will outweigh the gain.