Carbon deposits are dense carbon oil compounds. The oil accumulates on the surfaces of engine cylinder heads, cylinder liners, pistons, valves, combustion chambers, fuel injectors, etc. due to inadequate combustion of diesel fuel and oil seeping into the cylinders. Solid layer carbon deposits. The poor thermal conductivity of carbon deposits, long-term accumulation may lead to localized overheating of components, severe nozzle, valve ablation, piston ring blockage and pulling cylinder may lead to serious failure. In addition, if carbon deposits accumulate on the surface of the combustion chamber, it will also lead to an increase in compression ratio, premature ignition, detonation, etc., which seriously affects the engine’s power performance and fuel consumption. Therefore, agricultural excavators must be regularly inspected for carbon deposits and repaired by thoroughly cleaning them in a timely manner.

Method 1: Mechanical grinding method

The easiest and most straightforward method for carbon deposits is to mechanically polish them using tools. You can use a wire brush, bamboo or emery cloth to wipe the carbon deposits. For carbon deposition on specially shaped parts, special tools can be used. For example, carbon deposits around injector nozzles can be cleaned with a fine wire brush, and pressure chambers are made of special scraping needles. Valve guide bearing and valve seat carbon can be removed by cylindrical wire brushes.

Mechanical grinding method is difficult but inefficient, poor cleaning effect, and cleaning process leaves many small scratches, which destroy the smoothness of the parts and easily become new carbon accumulation points. So it is not recommended

Method 2: Spraying nucleus method

The nucleus spraying method is similar to the principle of sandblasting, but the particles sprayed are not sand grains, but crushed particles of walnuts, peaches and apricots with a softer texture. Nucleus spraying the use of high-speed airflow will be sprayed walnut sand to the surface of the parts to remove carbon and oil, in addition to carbon high efficiency, thorough and clean. However, this method requires special equipment and is difficult to adopt widely.

Method 3: Carbon removal additive

In addition to carbon deposit additives, carbon additives usually consist of four components: carbon solvent, diluent, retarder and active agent. When in contact with the carbon deposit, it can be softened and lose its ability to bind to the metal without damaging the metal parts.

This method is the most common method of carbon removal because it is efficient, effective and does not cause damage to the parts.