Don't let carbon deposits drag down the excavator engine, scientific repairs to renew power

Mar 6th,2025 69 Views

Among the many parts of an excavator, the valve is small in size but plays a vital role. Whether you are good at repairing excavators or not, you must be familiar with valves. Once the valve fails or wears out, it will directly affect the engine, among which engine carbon deposits are a very typical consequence.

1. Case analysis of excavator engine carbon deposit repair

Recently, we conducted an in-depth analysis of a valve seat wear failure. From the relevant pictures, you can have an intuitive understanding of the failure:

Severe wear of the valve seat: Each valve seat shows different degrees of wear, and some intake valve seats are almost worn out.

Characteristics of the worn parts: After careful observation, it was found that the worn valve seats were all intake valve seats, while the exhaust valve seats had no obvious signs of wear.

2. Popularization of knowledge points

In order to better understand the subsequent fault analysis, let's first popularize some basic knowledge about valves:

Working principle of valve: As a component that reciprocates up and down in the cylinder head, the valve's main responsibility is to complete the intake and exhaust work of the engine. During the operation of the engine, the precise opening and closing of the valve directly affects the combustion efficiency and power output.

The synergy between the valve and the valve seat: The valve fits tightly against the valve seat in the cylinder head, and can not only reciprocate up and down, but also rotate on the valve seat in a specific direction. This rotation action is very critical, which can effectively remove the carbon deposits on the contact surface between the valve and the seat, ensuring the smoothness of the intake and exhaust channels.

3. Analysis of carbon deposit failure in the excavator engine

Combining the above cases and basic knowledge, we analyze the carbon deposit failure of the engine as follows:

Cause of wear: The root cause of this failure is that when the valve rotates, the fitting part of the valve and the valve seat is subjected to continuous and violent impact of a large amount of debris or dust. This frequent and violent impact gradually wears the valve seat until it disappears.

Related factors: This type of failure is usually accompanied by damage to the intake impeller of the turbocharger. The damaged impeller produces debris, which will enter the valve and valve seat assembly along the intake duct, further aggravating the wear. The damage to the turbocharger impeller is largely due to the inadequate maintenance of the air filter, which causes a large amount of external dust to flow into the intake duct.

Fault-related system: It can be seen that this type of fault is closely related to the relevant components of the intake system, including the maintenance of the turbocharger and air filter, as well as a large amount of foreign matter entering the intake duct.

4. Treatment of carbon deposit failure in the excavator engine

For this fault, we took the following treatment measures: replace the worn valve seat ring and the damaged valve. During the replacement process, the new valve and valve seat ring were finely ground to ensure a good fit between the two. After the grinding was completed, the relevant parts were reassembled, and the engine carbon deposit failure was successfully solved.

5. Summary

Once the valve seat ring is worn, it will inevitably cause engine failures of varying degrees. In order to effectively avoid the occurrence of such faults and ensure that the excavator always maintains a good construction state, daily maintenance work cannot be slack. Especially for maintenance parts such as filter elements, they must be replaced in a timely manner in strict accordance with the prescribed time and mileage. At the same time, when choosing maintenance parts, it is important to choose products with guaranteed quality, and never bury hidden dangers to the normal operation of the excavator because of greed for cheapness. Only in this way can the excavator always maintain efficient and stable working performance and provide reliable power support for various engineering construction.

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