The service life of bimetallic cylinder liners is mainly determined by the following factors:

1. Material quality: The wear resistance, heat resistance, and corrosion resistance of the alloy material used for the cylinder liner are crucial. The alloy material can effectively resist high-temperature wear and chemical erosion.

2. Process manufacturing: Precise casting processes and surface treatment techniques have a direct impact on the smoothness, hardness, and bonding strength of cylinder liners, and good processes can improve their durability.

3. Usage conditions: The engine's workload, coolant quality, fuel quality, and lubrication condition all affect the cylinder liner. Excessive load or harsh working conditions can accelerate wear and tear.

4. Maintenance: Regular inspection and replacement of worn parts, maintaining appropriate oil pressure and cooling system efficiency, can extend the service life of cylinder liners.

5. Environmental factors: Improper control of cooling water temperature may cause the cylinder liner to overheat, thereby shortening its lifespan.

In summary, the service life of bimetallic cylinder liners is influenced by multiple factors such as materials, manufacturing processes, usage conditions, and maintenance. Good design and maintenance management are key to ensuring its long lifespan.