Ten misunderstandings in vehicle maintenance. Bearings for plain bearings must be scraped.

In recent years, there have been more and more car owners, and cars need regular maintenance. However, some limited-qualified repair centers often go into maintenance misunderstandings and affect the performance of vehicles. There are mainly 10 kinds of performances:

1. The bearing bush of the sliding bearing must be scraped. Modern cars, especially small engines, have thin wear-resistant alloy coatings on the crankshaft bearings and the connecting rod bearings. They are not allowed to be scraped and can only be selected according to the corresponding size. If there is no suitable size of the curved bearing, the crankshaft can be ground by the method of the base hole if necessary to obtain a suitable fit clearance.

2, the engine water temperature is not afraid of high. In fact, the low temperature of modern automobile engines is very harmful, which will cause insufficient combustion of the mixture, lower power, increased fuel consumption, and poor lubrication, which will cause excessive emissions.

3, the valve clearance is larger than the small point. In fact, the valve clearance is large, the valve lift filial degree is not enough, so that the intake air is insufficient or the exhaust is not smooth, which just reduces the engine power.

4. The more oil you add, the better. In fact, the addition of oil has caused damage to the engine, especially the inclined engine and the V-type engine. It increases the rotational resistance of the crankshaft and the connecting rod, and increases the amount of oil splashed onto the cylinder wall, resulting in an increase in carbon deposits in the combustion chamber. Therefore, if the engine oil is increased, it will reduce the engine power, increase the wear and tear, and cause the emission to exceed the standard.

5. Empty hub lubrication is not reliable. It is considered that the hub is filled with grease to ensure the lubrication of the hub bearing. The lubrication of the hollow hub coated with grease only on the bearing is not guaranteed, and the gap in the middle of the hub must be filled with grease. In fact, this not only wastes grease, but also affects the heat dissipation of the bearing, which is harmful to the lubrication of the bearing.

6, the brakes are good or bad, dragging the cherry blossoms and dragging the brakes to indicate that the wheels are already locked, and the modern cars just require the wheels to be locked, for which special anti-lock devices are installed. Once the wheel is locked, the car's steering is out of order, the wheel slips, and it is prone to failure, so the longer the trailer is, the better.

7. The gap between the breaker contacts is small. In fact, the contact gap is too large, the contact closing time is short, so that the primary side current of the ignition coil is reduced, causing the high-pressure spark to be weak, thereby causing the engine to be difficult to start.

8. Ignition advance angle or injection advance angle Ningda Do not ignite the ignition advance angle too large, easy to detonate. The engine produces a deflagration, which is extremely damaging to the piston, seriously affecting its service life, and the starting resistance of the engine is increased.

9. Fasten the bolts and keep them loose. In fact, the bolts of various parts of the car have corresponding values ​​according to the diameter, pitch and use. It is not good to loosen the bolts that do not reach the specified value, but blindly increasing the tightening torque will deform the fastened parts and cause the screw to elongate, the thread to deform or even break.

10, car maintenance, open the inspection before you rest assured. With the improvement of the manufacturing level, the life of modern auto parts has been greatly extended, and random dismantling will inevitably destroy the already mated state. In today's perfect vehicle failure detection technology, if there is no obvious fault in the component or assembly, it is generally not necessary to dismantle it.
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