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How to Check the Chassis of the Car before Buying

Posted by alexsmith in Business on July 18th, 2019

An important stage of acquaintance with the car you want to buy with your hands is checking the chassis of the car. Chassis - a large set of mechanisms, some parts here - consumable, as this part of the machine is moving, and directly its elements are responsible for contact with the road, taxiing and much more.

Even if the car is legally clean, and everything is in order with the main units like the engine, this is not a reason to rush and buy - look under the bottom, there are also enough vital elements for the car.

Those who are not ready to spend the diagnostic service in the service, reading, wondered how to check the chassis of the car yourself? We will tell about it in detail and in detail.

Independently check the vehicle chassis

If you decide to personally check the car, including look at what is under the bottom, it is important to know what to look for - there are four wheels around the perimeter of the car, in the middle most often - crankcase protection sheets, but this does not mean that there’s no looking for what.


First of all, the defective suspension elements give themselves out to be extraneous sounds. If other sounds are heard below, then the perpetrators requiring replacement or repair may be:

Shock absorbers - an element that takes on all the bumps and bumps from the road pits;
The springs of the pillars are constantly loaded, over time they inevitably “get tired” and require replacement;
Bellow CV joints - as the name implies, protects the item from dust. If it is dirty or ragged - replacement is required;

Support cups are resistant - by and large, they just have to be intact and not deformed;

Hobs are what various suspension parts are connected to. It consists of two metal bushings with a rubber insert in the middle. If when driving from the suspension elements go strong oscillations, and the car is not very stable, questions should arise primarily to this element;

Various backlash - can touch at once the many elements of the suspension, whether it be a CV joint, tips of steering rods and much more.

It is worthwhile to dwell upon some points for clarification of details, especially if many of these words have become something new to you.

Shock absorbers are the simplest, no special skills and abilities are needed here, and anyone can check their condition on the spot. To do this, just try to swing the car if it sways more than two times - shock absorbers for replacement. To verify their failure finally, you can pick up the car and inspect it from the side for any smudges.


With springs, it is somewhat more difficult - the fact that the springs “sank”, unfortunately, can not be seen with the naked eye. But it is very clearly visible if the spring is broken. Yes, and the height of the suspension of the car in which case hints - if the car is too low, then you should pay attention.

With anthers, everything is simple - if whole and clean, then we go further, if dirty or torn, or all together - we change. The part is not too expensive, even cheap (what can be expensive in a piece of rubber?), So torn and dirty anthers can be a cause for concern only if the owner travels with them in such a state for quite a while.

Diagnosing complex undercarriage components

Buying a used car with a self-diagnosis suggests that you have to "get a little dirty hands" and inspect the car from top to bottom. Some parts of the chassis are required to be checked more carefully and in several stages, since “by eye” it is no longer possible to identify the problem.



For example, silent blocks. Here everything is a little more complicated and you have to tinker if you want to know everything and for sure. If you checked the car on the move and noticed that the car “pulls” to the side while driving, the algorithm for checking sayletblokov is as follows:

Raise the car with a jack, and it is better to drive it to the inspection pit;
While the car is suspended, remove the ball bearings to get to the silent blocks;

Check the condition of the parts working in conjunction with the Hob. This is a suspension arm that you can swing and check that it is springing back. Check the sleeve, it does not rotate relative to the lugs. After that, check the silent block itself for a knock;

It is important to check the element for play and mechanical damage. If the element is too mobile, or it is damaged on metal parts or on rubber, you should be puzzled by the replacement of the entire element.
If you are not afraid to undertake the installation, you can, being under the car, check the condition of the stabilizers. If you stick the installer between the subframe and the stabilizer of the sleeve and shake, you will understand whether the elements are in good order or not. Too old sleeve due to deformation will lead to the stabilizer "walking". This indicates the need for replacement. However, for this procedure, you still need a lift, if you have in mind - use it, but it would be better to go to the service, where the procedure will hold a modest fee.

In the case of the brake system, everything is simple, if the car is on cast or forged wheels. If you are considering a simple version with “stamping”, here you can’t do without removing the wheel and studying the system elements.

Car suspension check

The condition of the brake pads is important - they should not be rusty and not erased. Otherwise, they must be replaced. The same applies to the brake disc, and here you can come in handy compass-compasses, since for different cars the installed thickness of the brake disc is different, and the easiest way to determine the state is the usual measurement.

The last thing I would like to mention cannot be attributed to any particular element, this applies to many elements at once, and in some cases can lead to serious consequences.

Examine the undercarriage for a variety of backlash. To do this, you need to find out how mobile certain suspension elements should be, and check with your own hands how mobile they are on the vehicle. Any backlash above the norm needs to be eliminated, and in some parts a large backlash (for example, in the steering) can be dangerous both for the car and for the people in it.


Another, simpler, but less economical option, how to check the chassis of a car before you buy it, is to pay for the diagnostics of the undercarriage in the service station.


Here, plus not only that you don’t have to crawl under the car yourself and check the elements for play, but also that diagnostics are usually complex and they will tell you not only about the chassis, but also other important details. and technical points of the car.

If you want to thoroughly know everything about the chassis and suspension of the car after checking, then ask the masters to check the chassis point by point to get information about its most important elements:

Shock absorbers;
Levers;
Pivot pins (fists);
Ball joints;
Springs;
Anti-roll bar;
Stabilizer's pole.

From the state of these running elements, conclusions are already drawn and a decision is made. The cost of complex diagnostics in the service is about 2-3 thousand rubles, and in this case, the master and lift the car on a lift, and learn the elements of the suspension, and tell you what to replace and what repairs are required to the car and its chassis.

Checking the chassis will tell about her condition, and how to care for the car in general. Not a single motorist who takes care of his vehicle will ever allow serious damage to the chassis and “launch” it. Cracked springs and torn anthers - a sign that the car is not cared for, and may be a reason to refuse to buy a car.

And do not forget to check the history of the car before you buy. This can be done using the service Autocode on the state. number or VIN . Inspection is carried out on 16 official sources: traffic police, RSA, EAISTO, FTS, FCS and others. In 5 minutes you will learn about all the problems that the car has: twisted mileage, the presence of a traffic police restriction, being searched, credited or arrested, and much more.

If the online check gave a positive result, and the machine is legally in good order, we recommend that you examine its technical component in more detail. For this, it is best to use the services of on-site inspection of cars . The specialist will arrive at the appointed time at the appointed place and examine your car with the help of special equipment. Thus, even the smallest hidden damage will be installed.

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