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Main reasons for early wear of piston rings

2020-05-11


1. The reason for the piston ring
(1) The structure of the piston ring material does not meet the technical requirements, and the organization is loose.
(2) The hardness of the piston ring is low and does not meet the requirements.
(3) The thermal stability of the piston ring is poor, and the metallographic structure changes greatly.

2. Reasons for cylinder liner
(1) The inner diameter of the cylinder liner does not meet the requirements and is too large or too small.
(2) The roughness of the inner hole of the cylinder liner does not meet the requirements, and the oil film is not easy to form.
(3) The verticality and roundness of the cylinder liner do not meet the requirements.

3. Other accessories
(1) The quality of air filter and oil filter is not good, a large amount of dust or excessive impurities in the oil enter the cylinder.
(2) Improper selection of friction pair.

4. Oil quality
(1) Poor oil quality.
(2) The quality of the fuel is inferior, the lead content is high, and the combustion products form abrasive, which causes abrasive wear.

5. Repair
(1) During the repair, the cleanliness is not enough, and there are impurities such as sand or iron in the cylinder.
(2) Improper selection of piston ring or piston size.
(3) When assembling moving parts, the fit clearance and bolt torque do not meet the requirements.

6. Use
(1) The temperature of the engine is abnormal, too high or too low will aggravate the wear of the machine parts.