Main Engine 4-Stroke · Main Engines (4-Stroke)
The MAN 20VV175D is a 20‑cylinder V‑type four‑stroke diesel main engine delivering about 4 440 kW (≈6 000 hp) at up to 1 800 rpm, designed for medium‑speed marine propulsion with dual‑fuel capability.
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| Lube Oil Analysis | 250-500 hours |
|---|---|
| Fuel Injector Overhaul/Replacement | 2,000-4,000 hours |
| Valve Clearance Check/Adjustment | 2,000-4,000 hours |
| Cylinder Head Overhaul (valves, springs, seats) | 8,000-12,000 hours |
| Turbocharger Minor Overhaul (bearings, cleaning) | 8,000-16,000 hours |
| Turbocharger Major Overhaul (rotor, casing inspection) | 24,000-32,000 hours |
| Major Engine Overhaul (pistons, liners, bearings) | 24,000-36,000 hours |
| Cylinder Liner Wear | Max 0.6-0.8 mm on diameter at the top dead center (TDC) position. |
|---|---|
| Piston Ring Gap | Max 1.5-2.0 times the new ring gap (refer to manufacturer's manual for specific values). |
| Valve Seat Recession | Max 0.5-1.0 mm from the original position (check manufacturer's specification). |
| Crankshaft Deflection | Max 0.05-0.10 mm (depending on engine size and specific MAN guidelines). |
| Main/Connecting Rod Bearing Clearance | Max 0.10-0.15 mm over the new bearing clearance. |
| Turbocharger Rotor Axial Play | Typically 0.10-0.20 mm (check specific turbocharger model data). |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
A class surveyor will typically focus on: 1. Review of engine logbooks, maintenance records, and lube oil analysis reports to confirm adherence to planned maintenance and operational parameters. 2. Verification of safety devices, including overspeed trip, low lube oil pressure shutdown, high jacket water temperature shutdown, and emergency stop systems. 3. Functionality test of remote control systems and local emergency controls. 4. Crankshaft deflection measurements (if required by class or based on engine condition/hours). 5. Visual inspection for any signs of leaks (fuel, lube oil, water), abnormal wear, corrosion, or structural integrity issues on the engine and its auxiliaries. 6. Verification of exhaust gas emissions monitoring system (if fitted) and compliance with relevant regulations. 7. Inspection of the fuel oil supply and treatment system, especially for HFO operation, including heating, purification, and transfer arrangements. 8. Confirmation of onboard spare parts inventory as per class requirements and manufacturer recommendations. 9. General cleanliness and fire safety arrangements within the engine room.
Estimated lifetime: 30,000 - 60,000 hours before major overhaul (e.g., piston, liner, bearing replacement). Total design life often exceeds 100,000 hours with diligent maintenance.
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