Chery 4g 16 cylinder head screw torque

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What is the torque of the automobile cylinder head screw?

Release date: 2021-1014: 48: 05 Author: Xiang Lele

Automobile cylinder head screws have torque. If you tighten it too tightly, it is likely to damage the thread. So, what is the screw torque of the automobile cylinder head? Today, we will reveal it for you. Actually, the torque for tightening the cylinder head screw depends on the size of the bolt. Generally, the engine cylinder head screws need to be tightened by 89 kilograms and five or six connecting rods.

What is the torque of the automobile cylinder head screw?

Automobile cylinder head screws have a torque. If it is tightened too tightly, it is likely to damage the external thread. So, what is the torque of the cylinder head screw? Let's announce it to everyone today.

In fact, the torque for tightening the cylinder head screws must be determined according to the specifications and sizes of the bolts. Generally, the cylinder head screws of automobile engines should be tightened by eight or nine kilograms, the crankshaft by five or six kilograms and the engine crankshaft by more than ten kilograms. Actually, it should be in accordance with the provisions of the user manual. But as the saying goes, if you are skilled and have work experience, you can judge by the touch of tightening even if there is no detailed specification data information.

Tightening method of cylinder head screw:

1. First, screw it from the inside to both sides. First, screw 50% of the final torque and loosen it completely.

2. Then twist 50% from both sides inside.

3. Finally, it is better to tighten the cylinder head screws according to the method of first inside and then two sides.

But don't tighten it too tightly, otherwise the bearing capacity of the anchor bolt will be too large, which will not only lead to the sliding of internal and external threads, but also lead to the deformation of the anchor bolt with a certain probability, and may even break immediately. Therefore, before tightening, everyone should always know the torque of the anchor bolt.

Torque of cylinder head screws of various engine models

Precursor of timing belt fracture

Synchronous belt belongs to rubber and plastic products. When used for a long time, it is easy to embrittle and break, which will endanger the operation of automobile engines and will continue to cause many common faults and some omens. What is the precursor of timing belt fracture? Ignoring this precursor will have a bad influence. Let's meet below.

Precursor of timing belt fracture

If it is found that the speed of the car is unstable during driving and it is very easy to turn off the engine, then some people will feel powerless during this process. Obviously, the car may be idling and shaking. If this happens, it is likely that there is something wrong with the timing belt, and it may be that the teeth are cracked or lost, which are all precursors of belt fracture.

Bad influence of timing belt fracture

When the timing belt breaks, the contact between the engine camshaft and the engine crankshaft is finally broken. At this time, the engine camshaft is not driven by energy, and the opening and closing of the cylinder group controlled by it is invalid. The piston rod will bend the piston rod due to inertia. If the rotating speed is relatively high, the piston rod may also cause burning, and in serious cases, it will immediately cause damage to the automobile engine. If it is found that the timing belt is broken, it should be tilted immediately and wait for rescue. Regularly maintain the timing belt at ordinary times, check whether there is dirt of automobile oil and refrigerant on the surface of the belt, and if there is, thoroughly remove it; Check whether the belt teeth are damaged and whether there are cracks on the surface. If there are cracks, remove and replace them immediately to prevent the engine from knocking due to fracture.

The service life of timing belt is generally 3 years or more than 60,000-80,000 kilometers. In fact, it depends on the specific application of automobile system and automobile, refer to the automobile maintenance manual. In addition, the tightness of the belt is also very important. If it is too tight, the tension is too great and it is easy to break. If it is loose, it will make noise when running, which will easily lead to the lag of engine timing, resulting in car vibration, weak oil supply, insufficient driving force and increased fuel consumption. It is also very easy to jump teeth when the engine load is relatively large or the driving force is impulsive, which is easy to cause the cylinder to jack up and further damage the automobile engine. It is best to adjust the belt tightness to the downward pressure of 10mm and rotate it by 90.

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Car idling instability flameout

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How big is the Magotan hub screw?

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