Importance of cylinder liner phosphating process

Common failure and prevention of two kinds of cylinder liner

1. Typical problems of dry cylinder liner

Cylinder liner and cylinder body fit poorly: insufficient interference during installation, resulting in reduced heat dissipation efficiency, local overheating caused cylinder pulling.

Uneven inner wall wear: piston offset cylinder (connecting rod bending or cylinder block deformation) leads to unilateral wear of cylinder liner, appearing "waist drum shape".

Preventive measures: Periodically check the cylinder pressure to avoid long-term overload operation of the engine, and measure the matching gap between the cylinder liner and the cylinder block during overhaul (standard value is usually 0.02-0.05mm).

2. Typical problems of wet cylinder liner

Aging of the seal ring leakage: vehicles used for more than 5 years are prone to hardening of the seal ring, resulting in coolant infiltration into the oil pan (oil emulsification, milky white).

Cavitation (cavitation) damage: Bubbles in the coolant burst and impact the outer wall of the cylinder liner, forming a honeycomb pit (common in diesel engines, due to higher burst pressure).

Preventive measures: Replace the coolant every 2 years (choose the original model, containing anti-corrosion additives) to avoid mixing air in the coolant (check the seal of the pump impeller and water tank cover).

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