What is the material of the engine block and how to repair the engine block

The engine block can be said to act as a brain of the engine and has the effect of regulating temperature. But when asked what is the material of the engine block, many friends did not understand this point. Today we will give you a popular science.

There are two types of cylinder materials commonly used in the market: cast iron and aluminum alloy. But now the proportion of aluminum alloy cylinders is getting higher and higher, because cast iron cylinders not only have the disadvantages of large weight and poor heat dissipation, but also have relatively high friction coefficients, so they will naturally consume more when working. energy. The aluminum alloy cylinder block can make up for the shortcomings of cast iron, but at the same time it also has shortcomings. It is easy to chemically react with the water generated during combustion. In other words, the corrosion resistance is not as good as cast iron.

How to repair the engine block:

1. First of all, sand out the rust around the cracks of the cylinder block with coarse sandpaper. When it is polished to a certain degree, we can find the cracked end.

2. Then, just proceed to the welding patching machine directly. But pay attention to the warpage phenomenon of the welding part. If there is any, be sure to hit the weld while it is hot to avoid leaving some welding slag on it.

3. After the patch is completed, we also need to pad the patch plate and the cylinder block (cylinder head) with a layer of asbestos pad, and then apply a layer of lubricating oil on both sides.

It is worth mentioning that whether the engine block can be repaired or not depends on the actual situation. First of all, if it is a dry or wet engine block, it is generally difficult to repair. After all, the cylinder liner of this kind of cylinder block is very thin, so it can only be replaced with a new cylinder block. If it is a wet engine block and the degree of cracking is relatively small, we can boring the cylinder and replace the cylinder liner, but if the situation is serious, a new cylinder block must be replaced.

Secondly, we also need to look at the location of the crack. If it is in the middle of the engine, we just need to repair it according to the above-mentioned method, but if it is actually at the cylinder head gasket of the engine, it will be a bit old. Only replace the engine block with a new one.