What are the differences between four-matching and six-matching sets?

[Carole]

Engine four-matching set includes: piston, piston pin, piston rings, and cylinder liner. Engine six-matching set includes: connecting rod, piston, piston rings, cylinder liner, main bearing shells, and connecting rod bearing shells. Below are the related introductions: 1. Four-matching set: Its purpose is to provide convenience for users when purchasing parts for diesel engine repairs. When there is no cylinder liner, it is called a piston assembly. 2. Six-matching 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, 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 important and most prone to failure components in the engine.