Maintenance items and matters needing attention of automobile chassis

Every season, 4S stores will launch some free inspection items to help you check the basic situation of vehicles, and almost 100% manufacturers will provide chassis inspection items. Don't underestimate the chassis inspection items. It is necessary to know that the quality of the chassis system is related to whether our vehicles can run normally, and in the used car market, judging the quality of vehicles is one of the most intuitive standards. So today we will talk about the maintenance knowledge of chassis.

First of all, what caused the car chassis to be damaged!

First, dragging the bottom, foreign objects hit the chassis.

Seriously, the speed of road construction in China really surprised me. The road that was just repaired today will be repaired tomorrow. Incise the abdomen. But when the road surface is repaired, in most cases, there will be many big stones or potholes. At this time, when our car is driving on such a road surface, the bumps of big stones or other roads will be in close contact with the chassis of our car, which is what we often call dragging the bottom.

Every car has its own approach angle, departure angle and passing angle, which will drag the bottom if it exceeds the value;

Due to the uncertainty of mop, it is easy to damage the parts located in the chassis, such as the cracking of the three-way catalyst shell, the cracking of the engine oil pan, the cracking of the gearbox shell or the deformation of the suspension system. These problems will bring fatal damage to your car.

Second, corrosion.

Now the environment is really getting worse and worse. Even the rain is acid rain. In this environment, our car may increase the possibility of damage. Because the chassis often comes into contact with sewage, oil stains and other substances, and the chemical components in these substances will slowly corrode the chassis and the parts on the chassis, so we should pay more attention to the anti-corrosion of the chassis.

In addition to the danger that rain and sludge will corrode the chassis, deicer and seawater used for snow melting in winter will also corrode our chassis, especially seawater. If you drive to the seaside by yourself, don't drive to the sea. Seawater is very corrosive to chassis. If you don't pay attention to touching the chassis with seawater, please clean the chassis with plenty of fresh water or neutral detergent as soon as possible.

Third, how to avoid it?

Generally speaking, just now, in order to prevent the chassis from being damaged, the 4S shop will advise the owner to install the hood or chassis &; Ldquo chassis armor &; Rdquo chassis protection. I strongly recommend the suggestion of installing engine hood, because some economical cars will not install protective devices under the engine and gearbox in order to save costs, so that the engine and gearbox will directly contact the road. After installing the engine guard, you can manually protect the engine, gearbox and important parts located in the front chassis, so that even if the bottom support does occur, it will contact the guard before the important parts are damaged.

& ampLdquo Chassis Armor & Rdquo is a case protection technology that has emerged in recent years. The bottom surface of the automobile chassis is sprayed with a layer of elastic sealing material with a thickness of 2 ~ 4 mm The chassis armor can effectively protect the impact of road gravel on the chassis and prevent the bottom mop from rubbing slightly. Prevent acid, alkali and salt from corroding the chassis; Prevent chassis screws from loosening; Reduce the transmission of noise during driving and increase the sense of tranquility during driving; Prevent the chassis iron plate from conducting heat, and make the cab warm in winter and cool in summer.

I have used the two chassis protection measures mentioned just now, and the engine guard is very useful, especially for those vehicles with soft springs, because when driving at high speed and passing through potholes on the road, the compression of the soft springs will reach the limit, resulting in contact between important components such as the engine and ground objects, causing damage.

As for&; Ldquo chassis armor &; Rdquo, I also suggest you use this measure. Although it can't be immediate, it is always good to be prepared.

Knowledge expansion:

1) How to choose a qualified engine protective cover?

There are four main types of engine guard plates: hard plastic, resin, steel and aluminum alloy. The characteristics of different types of protective plates are essentially different. I believe that after reading the following introduction, you will know what kind of engine guard plate to choose.

1. hard plastic and resin protection plate.

The price is relatively cheap and the manufacturing process is simple. However, it should be noted that the fender made of this material is easy to break, especially in winter. It can't be repaired after being damaged, and it can't play a long-term protection role.

Advantages: light weight and low price.

Disadvantages: easy to damage.

2. Steel or manganese alloy protective plate.

However, it should be noted that when choosing this kind of guard, it is the matching of its design style with the quality of cars and accessories, so we must choose the products of regular manufacturers. The fender made of this material can protect the important parts of the engine and chassis to the greatest extent in Chengdu, but it has a disadvantage that it is heavy.

Advantages: Strong impact resistance.

Disadvantages: heavy weight

Three. Aluminum alloy protective plate.

It should be noted that many beauty shops are promoting this kind of products, focusing on the high profits behind their high prices, but their hardness is far less than that of Steel Guard. It is difficult to repair the damage, and the alloy material is extremely complex, so it is difficult to determine its characteristics, but it is characterized by light weight.

Advantages: light weight

Disadvantages: high price and low material strength.

The installation of the hood is very simple. Buy a protective sleeve that matches your own model, and you can install it in 10 minutes, or even complete the operation yourself.

2) The price of chassis armor on the market is different. How to dazzle?

At present, the price of chassis armor on the market is not uniform, ranging from several hundred yuan to several thousand yuan. But basically, the materials used in the places where chassis armor construction can be carried out are basically the same, but the manufacturers are different. Due to the lack of relevant system management, the price profit of chassis armor is very high, so please pay attention when choosing construction site. Generally, the price of chassis armor with better quality is around 500-800 yuan. At present, the main brands used in the market are Henkel and American 3M.

In addition, if you decide to armored chassis, please be sure to take care of the equipment at the construction site. & ampLdquo Chassis Armor & Rdquo construction is quite troublesome. First, carefully remove the oil stains on the chassis, and thoroughly remove asphalt and oil stains. Use a special cleaner and dry it. Any negligence in these treatments will affect &; Ldquo armor &; The firmness of rdquo. Then seal the parts that need heat dissipation, such as transmission shaft and exhaust pipe, and spray adhesive tape or waste newspaper. In order to avoid accidental damage and affect its normal operation, these tapes or newspapers should be removed after construction to avoid danger.

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