What is the difference between a four-piece set and a six-piece set?

[McJade]

The difference between a four-piece set and a six-piece set lies in the components they include. The engine four-piece set consists of: piston, piston pin, piston rings, and cylinder liner. The engine six-piece set includes: connecting rod, piston, piston rings, cylinder liner, main bearing, and connecting rod bearing. Four-piece set: Its purpose is to provide convenience for users when purchasing parts for diesel engine repairs. If there is no cylinder liner, it is referred to as a piston assembly. Six-piece set: These are the moving components of the engine, working in conjunction with the fuel system and valve train. They complete the engine's intake, compression, combustion power, and exhaust strokes, converting chemical energy into mechanical energy to output power. Because they endure significant mechanical and thermal loads, they are the most critical and most prone to failure components in the engine.