The Cause of Carbon Deposition in Excavator Engines

Firstly, let's discuss what carbon deposition is. Carbon deposition is actually the product of incomplete combustion. When the engine is operating, unsaturated olefins and resins in the engine oil and fuel will deposit under high-temperature conditions due to incomplete combustion. This black, charred substance is often referred to as carbon deposition, which can be divided into valve, combustion chamber carbon deposition, and intake pipe carbon deposition.

Why does the excavator engine accumulate carbon?

During the use of the excavator engine, various faults will occur, and carbon deposition is a common one. Without further ado, let me tell you about the three reasons for carbon deposition in excavator engines.

Excessive impurities in the fuel commonly used by excavators. In real life, fuel cannot be completely pure, and the filter also has its filtering limit. Some small impurities in the fuel will carbonize and deposit in the cylinder after combustion, resulting in carbon deposition.

Wear of moving parts in the engine. When the engine is running at high speed, the cylinder liner, valves, pistons, piston rings, etc., will generate debris due to wear, and the debris will melt and deposit in the cylinder, causing valve carbon deposition.

Insufficiently pure intake air. The filter cannot completely filter out impurities in the incoming air. Some impurities will enter the combustion chamber and carbonize after combustion, resulting in carbon deposition.

What impact does carbon deposition have on the engine?

Carbon deposition will reduce the power of the engine, causing uneven power output and increased fuel consumption.

As carbon accumulates more and more in the piston groove, it will stick to the piston ring, causing the piston ring to deform, scratch the cylinder liner, and even pull the cylinder.

A large amount of carbon deposition sometimes blocks the fuel injector, which requires replacement of the injector.

When there is too much carbon deposition on the valve, the valve will be subjected to uneven force, which may cause valve stem breakage, valve seat breakage, and other failures.

Serious carbon deposition in the combustion chamber causes cylinder detonation, noise during low-speed acceleration, damages the piston and crankshaft, and affects the safety of the excavator.

What are the solutions to carbon deposition?

To prevent carbon deposition, choose high-quality engine oil and fuel for your excavator, as impurities such as wax and resin in the fuel are the main causes of carbon deposition.

When carbon deposition occurs in the engine, you can purchase carbon removal additives, which reduce the adsorption of resin and deposits and are also one way to reduce carbon deposition.

A more direct method is mechanical grinding. You can use wire brushes, scrapers, bamboo chips, or sandpaper to grind and clean the carbon deposition.
 

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