The main parts of a ship's main engine include the cylinder block, pistons, and crankshaft, which convert fuel energy into mechanical power.

Key engine parts also consist of the fuel injection system, turbocharger, and cooling system to ensure efficient combustion and temperature control.

Additional components like the connecting rods, camshaft, and lubrication system support smooth operation and reduce wear.

1. Cylinder Liner: Material - Cast iron or alloy steel; Size - Diameter 200-1000mm, Length 500-3000mm; Grade - ASTM A48 or equivalent.

2. Piston: Material - Aluminum alloy or forged steel; Size - Diameter 200-1000mm, Height 300-1500mm; Grade - ASTM A356 or equivalent.

3. Connecting Rod: Material - Forged steel; Size - Length 1000-4000mm, Width 150-500mm; Grade - ASTM A668 or equivalent.

4. Crankshaft: Material - Forged steel or nodular cast iron; Size - Length 3000-10000mm, Diameter 300-800mm; Grade - ASTM A668 or equivalent.

5. Camshaft: Material - Alloy steel; Size - Length 2000-6000mm, Diameter 100-300mm; Grade - ASTM A322 or equivalent.

6. Turbocharger: Material - Stainless steel or titanium alloy; Size - Diameter 500-1500mm, Weight 200-1000kg; Buoyancy - N/A (mounted on engine).

7. Fuel Injector: Material - High-grade steel; Size - Length 200-500mm, Diameter 20-50mm; Viscosity - Compatible with fuel grade (e.g., ISO 8217).

8. Bearings: Material - White metal or bronze; Size - Diameter 100-500mm, Width 50-200mm; Grade - ASTM B23 or equivalent.

9. Cooling System (Pump): Material - Cast iron or stainless steel; Size - Flow rate 100-1000 m³/h; Viscosity - Compatible with coolant (e.g., ethylene glycol).

10. Exhaust Valve: Material - Heat-resistant steel; Size - Diameter 50-200mm, Length 100-400mm; Grade - ASTM A297 or equivalent.

11. Lubricating Oil Pump: Material - Cast iron or steel; Size - Flow rate 50-500 L/min; Viscosity - SAE 30-50.

12. Flywheel: Material - Cast iron or steel; Size - Diameter 1000-3000mm, Weight 500-5000kg; Buoyancy - N/A (fixed component).