Common faults and analysis of piston rings

The working condition of piston rings is influenced by various factors, such as engine structure, combustion pressure, cylinder type, final finishing of cylinder surface, piston quality, fuel used, quality of lubricating oil, and the final quality of the piston rings themselves.

1. The piston ring is not wear-resistant

Poor lubrication of piston rings ensures good lubrication of piston rings

Carbon buildup on piston rings ensures complete combustion of fuel and prevents carbon buildup

The surface shape and surface treatment of the piston ring should be selected reasonably, and the surface should be treated with chrome plating, molybdenum spraying, nitriding, etc

Cylinder liner deformation ensures that the cylinder liner does not deform

Attention should be paid to cleaning the piston ring during assembly due to corrosion and wear of the piston ring, as well as material wear, to ensure clean air filtration

2. Piston ring fracture

Under working conditions, the closed clearance of the piston ring is too small, and the open ends collide and are compressed. Choose the appropriate closed clearance of the piston ring

The gap between the piston ring and the bottom of the ring groove is inappropriate, and the fit gap between the piston ring and the ring groove is appropriately selected

The deformed part of the piston ring is stuck to prevent deformation of the piston ring

Piston ring vibration prevents deformation of the piston ring

Detonation causes an increase in combustion pressure, resulting in a smooth and continuous combustion process

Incorrect operation during installation, using specialized ring installation tools

3. (Oil leakage) Burning engine oil

Unreasonable selection of oil ring, reasonable design of oil ring elasticity, side clearance, etc

Unreasonable selection of gas ring, reasonable design of gas ring side clearance and other parameters

Choose the correct fit clearance when the fit between the piston and cylinder liner exceeds the tolerance

Improving the surface roughness of the cylinder by improving the roughness of the cylinder surface

Running at too high a speed within the rated speed range

Choose the correct oil for high oil viscosity

4. Adhesive bonding

Excessive piston ring temperature reduces piston ring temperature

The gap between the piston ring and the bottom of the ring groove is inappropriate, and the fit gap between the piston ring and the ring groove is appropriately selected

Improper selection of piston rings and use of trapezoidal rings

Magazines are produced after fuel combustion, and high-quality fuel is often used