Water tank frame for second-hand car evaluation

The water tank frame is an area where problems often occur in front of the vehicle. It is also a common collision area of ??the vehicle. A true understanding of the water tank frame can better help us reflect the true condition of the vehicle. Let’s take a look at it together. Look!

1. Material of water tank frame

Currently, there are two types of materials on the market: (1) plastic material (2) iron material or alloy material;

There are three forms of mixing and matching of the two materials: one is a water tank frame made of pure plastic, like Changan CX-5, Yuedong; one is made of pure iron; one is made of iron below Plastic cover. There are also many cars made of plastic, and I can’t remember many of them, so I just picked two cars to write about.

2. The structure of the water tank frame

Currently, there are two structures on the market: one is integral:

This form is integral , which is also the most commonly used form on the market. In some places, the water tank frame is called a gantry. You can also see from the picture that the appearance is very similar. There are many similar names like this in various places, and we should also understand, otherwise you will not know which components they are talking about: some parts of the gearbox are called brake boxes, some parts of the steering knuckle are called horns, and some parts of the glass kettle are called It is called Big White Goose. Many names are derived from the appearance of the components. You can familiarize yourself with similar things. We will not go into details. Anyone who has done repairs will basically know it.

One is the split type:

This is the common split type, generally divided into three sections, connected by bolts or welding spots.

3. Water tank frame testing items

After understanding the above structure and material, let’s talk about its testing items:

(1) Check whether there is Traces of deformation;

(2) Check whether there are traces of rust;

(3) Check whether the overall water tank frame has signs of disassembly, and then determine whether it needs to be replaced

(4) Check whether the water tank frame has the original factory mark

(5) Check whether the mounting holes and positioning holes are deformed

(6) Check whether there are signs of breakage (plastic water tank frame) < /p>

(7) Check whether the solder joints have been re-soldered

I think any evaluator can name a few of the above inspection items, or even a lot. But why do problems often occur during the actual evaluation process? Some people only understand the testing items, but do not know the purpose of the testing items; some people know it, but its testing position is wrong, so that many things are missed. damage.

Second-hand car evaluation is not only about understanding the testing items, but also about the location of your testing. The appraiser stands at different angles. The components you see in your field of vision are not used. Don’t cover your blind spots. . An experienced appraiser not only understands the items that need to be inspected, he also knows where the common damage locations of components are and where the damage can be seen more clearly.

4. Water tank frame detection position

From this picture, I have marked 4 positions. Generally speaking, the observation direction for many evaluations is at 1 position, which is facing directly Looking down at the vehicle's water tank frame from the vehicle, only the surface of the water tank frame can be seen from this orientation, and many problematic areas cannot be detected.

Let’s look at two locations. During inspection, you need to stretch your head and bend down to observe the situation behind the water tank frame. In practice, we found that many cars are on the innermost side of the water tank frame (the side closest to the firewall). The edges are more likely to develop sheet metal deformation and large-area rust, which is worth noting.

In the third position, the appraiser should squat down and observe the lower bracket of the water tank frame from the direction of the center grille, bumper, and bottom of the vehicle, including the lower part of the engine and chassis components of the vehicle. This position is often affected by the lower part of the vehicle. A collision occurs, causing the lower components of the vehicle to deform, resulting in cracks in the overall water tank frame (plastic water tank frame)

The fourth position is also the most easily overlooked position by many appraisers. We know that not all water tanks The frame has components of lower brackets and upper and lower brackets. For water tank frames with lower brackets, you must focus on checking its connecting components. This part often suffers from serious deformation.

5. Distinguish between original parts and auxiliary parts

(1) Original factory logo on the water tank frame

There is usually an original factory logo on the water tank frame, but There are also some models that do not have specific markings. The original factory markings usually have some information about the fan or some information about R134a. Now we can buy the original logos of various models on the almighty Taobao.

Since it is so easy to buy the original logos, then we have no way to distinguish whether they are rear stickers. Up. In fact, there is still a way: the original logos on the vehicle are treated with high temperature and are pasted after reaching a certain temperature. It is difficult to destroy the original logos after they are pasted, unless some special cleaning agents are used, and then the purchased logos are , it is attached at room temperature. When you tear it off, you will find that it is relatively simple.

(2) The workmanship quality of auxiliary factory parts

Size: The size of auxiliary factory components is generally different from that of the original factory, especially in some connection, fixed positions, and evaluation The engineer can judge whether the installation is appropriate by observing the bolts and positioning holes at the connection.

Workmanship: The workmanship of the sub-factory components is obviously not as good as the original components. If you look carefully, you will find some small holes on the water tank frame. These small holes can help us judge.

Pay special attention to these small holes in the picture during actual evaluation work. Observing whether the small holes are deformed can help us quickly determine whether there are traces of impact or repair on the water tank frame. Observing whether there are burrs in the small holes, It can help us quickly judge whether it is a sub-factory component. The judgment method: touch the inside of the small hole with your hand and walk around inside the small hole. The sub-factory component will feel a certain sense of obstruction and it will obviously have a stinging feeling. Plastic The water tank frame made of material is more practical and the difference is very obvious.

　(3) Water tank frame color

Many appraisers basically don’t pay attention to the color of the water tank frame. What tricks can color help us see? Listen to me slowly Now, we should understand one of the fundamentals, that is, for a car component or an object, its color is basically the same. Usually, we do not spray multiple colors on one component, and the water tank frame is no exception. Generally, Generally speaking, its color is consistent and will be the same as the color in the cabin. When you find that the color of the water tank frame is inconsistent with the basic color tone of the cabin components, do you have a question mark in your mind? If the water tank frame is replaced, it will usually Paint it the same color as the cabin and then install it.

Some people may say that what you said is wrong. Not all cars are like this. I just want to say here that friends who read my articles must be clear that my articles are all in To sum up some general things, it will be generally applicable to most models, but not to all models. Are there any special models? Yes, let me introduce to you a typical model, Nissan's Tiida. I think many appraisers have not paid attention to Tiida's water tank frame. Tiida's water tank frame is made of alloy and is split. It is divided into three sections. What is particularly prominent is that the color of the middle section is obviously different from the colors on both sides. Different (note that this is the original factory state), just look at the picture below:

Let’s take a look. The base color of the entire Tiida cabin is darker, and the parts circled with red circles at both ends are the water tanks at both ends. The color of the frame is black; and the part enclosed by the yellow box in the middle is the middle section of the water tank frame. Its color is gray, which is obviously inconsistent with the color of the two sides, but it is the original one, which is important. Let me say this three times: the color of the Tiida middle water tank frame is inconsistent with the color of the two ends from the original factory; the color of the Tiida middle water tank frame is inconsistent with the original color of both ends; the color of the Tiida middle water tank frame is inconsistent with the color of the two ends.

If you find that the middle section of Tiida’s water tank frame is black and the same color as both ends, it must have been replaced. At this time, you need to carefully inspect other parts. So is such a special model just a Tiida? The answer is definitely not. It is worth noting that many models in the Nissan series: Bluebird, Tiida, and Liwei, they generally have one characteristic: the color of the middle water tank frame is gray , the color of the water tank frames at both ends is consistent with the color of the actual car. If the color of the actual car is blue, then the water tank frames at both ends will be blue. Go down and take a closer look.