What does replacing the assembly mean?

[DiRuby]

Replacing the assembly refers to the replacement of the entire integrated unit of the car, including the internal combustion engine, starter, oil pump, etc. After replacement, it becomes a fully functional machine. Advantages of replacing the assembly in a car: In automotive repairs, the assembly replacement method is sometimes adopted. This involves removing a specific assembly from the car and replacing it with a new or repaired and inspected assembly, thereby reducing repair time and improving the organization and quality of the repair work. Impact of replacing the assembly on the vehicle: Mid-use replacement of the assembly is generally performed at repair shops or 4S stores. The replaced engine is not the original one but a reassembled version using the old engine block. The details of such replacements are certainly not as refined as the original factory assembly. Disassembling and reassembling the engine can affect wiring and other components, introducing many uncertainties in later use.