Bus Engine Removal and Installation Dawoo to vchai ingine install

System Depressurization: Safely drain all engine fluids (coolant, oil, fuel) into approved containers. Bleed air lines and depressurize the cooling system to prevent hazardous spills. Clearance & Access: Remove all peripheral components blocking access, such as the radiator assembly, CAC (Charge Air Cooler), air intake piping, and exhaust aftertreatment components. Logical Disconnection: Systematically disconnect the "three pillars": Electrical: Tag and unplug the Engine Control Module (ECM) harnesses and chassis wiring. Mechanical: Disconnect throttle linkages, fuel supply/return lines, and transmission coupling. Structural: Remove the driveshaft and support brackets. Safe Extraction: With the engine secured to a heavy-duty hoist, remove the mounting bolts. Carefully lift the engine, ensuring clear travel paths to prevent damage to the engine bay or surrounding frame.