Learn the engine cooling system

The function of the cooling system is to keep the engine within the appropriate temperature range under all working conditions. The cooling system should prevent both engine overheating and winter engine overcooling. After the engine starts cold, the cooling system also ensures that the engine heats up quickly and reaches the normal working temperature as soon as possible.

Functions and requirements of cooling system

When the engine works, high temperature and high-pressure gas will be generated in the cylinder. If the engine is not damaged by the heat parts, the engine cannot work properly. The function of the cooling system is to ensure that the engine works in the normal temperature range by heating parts. The specific design requirements are as follows:

Ensure that the engine works in the optimal temperature range under any working condition.

The engine can reach the optimal temperature range in a short time after starting.

Ensure the heat dissipation efficiency of the radiator, the material consumption is less. Water pump, fan consumption power is small, low noise.

The parts in the cooling system are easy to disassemble and repair.

Structure and characteristics of cooling system

Basic structure

The basic structure consists of an engine waterway, water pump, radiator, fan, temperature joint, and connection line In order to ensure that the remaining gas in the cooling system can be discharged smoothly, sufficient water is added, and the engine is discharged thoroughly. Kubota engine has a high voltage common cooling system. In LandKingParts we sell Kubota engine parts and accessories for commercial vehicles, construction machinery, forklifts, farm machinery, compressors, generator sets, and ships. Deutz engine has superb quality if there is a need, welcome to consult to buy.

Generally, the upper chamber (radiator inlet chamber) inlet is the highest point of the engine cooling system, and the outlet is the lowest point of the cooling system.

Structural characteristics

1. simple structure

2. when the engine works, the water will overflow when the water temperature rises. The cooling system cannot work under full water, is easy to produce gas, and degassing is not complete.

3. the upper and lower rooms of the radiator are at the highest point, and lowest points of the cooling system, which brings difficulties to the cooling system and the vehicle layout.

4. in order to prevent the excessive amount of water loss in the cooling system, the upper room of the radiator must be increased, so that the material is wasted and the volume of the radiator should be increased.

As a result of the above reasons, this kind of structure cooling is not used in foreign countries and is gradually eliminated in China.

With compensation bucket structure and characteristics

The function of the compensation bucket is that when the water temperature rises, the water expansion and overflow can be discharged into the bucket. When the water temperature drops, the water volume of the cooling system decreases, and the water in the bucket will be reabsorbed back to the cooling system. This ensures that the engine can always be filled with water in any cooling system The structure is simple, the radiator can greatly reduce, save materials, and reduce height. The degassing effect is good, and the cooling system is always filled with water. As the basic structure, the upper and lower chambers of the radiator should also be at the highest and lowest point of the cooling system, which brings difficulties to the layout of the whole vehicle of the cooling system. In order to ensure that the water in the bucket is in and out, the sealing requirements of the cooling system are high. The position of the compensation bucket is relatively random, but the discrete heat heater is relatively close, and the highest point of the compensation bucket can be roughly the same as that of the radiator.

Structure with expansion tank

An expansion tank is added to the basic structure, and the expansion tank is arranged at the highest point of the cooling system, and the highest point of the radiator can be lower than the engine, which brings great convenience to the vehicle layout. The function of the expansion tank is similar to that of the compensating bucket, which improves the back of the cooling water level, but the use effect is the best. The cooling system should choose the structure with an expansion tank first, and secondly, the structure with a compensation bucket, the basic structure is not generally selected.

The reason why diesel engines have a poor cooling effect

1. Insufficient cooling water content of diesel engine;

2, diesel cooling water pump discharge pressure is not enough, water supply is insufficient or interrupted;

3. The diesel engine throttle device cannot be opened in time or not fully;

4. The cooling water channel is corroded or dirty too clogged, and the flow rate of cooling water cannot meet the requirements;

5, the cooling water channel contains bubbles, stored in the cooling chamber did not release and caused gas resistance;

6, the cooling water quality is too dirty, the water temperature is too high after the water scale is too high to block the channel;

7, cooling water pipe bending or blocking;

8. There are many scales in the cooling