Main Engine 4-Stroke · Main Engines (4-Stroke)
The MAN L48/60 8LL48/60 is an eight‑cylinder, medium‑speed marine diesel engine delivering about 9 600 kW at 514 rpm, designed for direct‑drive main propulsion with flexible fuel use (MGO/HFO).
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| Fuel Injectors Overhaul | 3,000 - 6,000 hours |
|---|---|
| Exhaust Valves Overhaul/Inspection | 6,000 - 12,000 hours |
| Piston Overhaul (Inspection & Ring Renewal) | 12,000 - 18,000 hours |
| Cylinder Head Overhaul | 12,000 - 18,000 hours |
| Turbocharger Minor Overhaul (Cleaning & Bearing Check) | 6,000 - 12,000 hours |
| Turbocharger Major Overhaul (Full Strip-down & Inspection) | 18,000 - 24,000 hours |
| Connecting Rod Bearings Inspection | 12,000 - 18,000 hours |
| Main Bearings Inspection | 24,000 - 36,000 hours |
| Crankshaft Deflection Measurement | 1,000 - 2,000 hours or as per PMS |
| Cylinder Liner | Max 0.6 - 0.8 mm ovality/taper from nominal bore (480mm) |
|---|---|
| Piston Ring Gap | Max 1.5 - 2.0 mm (measured at bottom of liner, new typically 0.4-0.6 mm) |
| Exhaust Valve Seat Recession | Max 0.5 - 1.0 mm from nominal position |
| Connecting Rod Bearing Clearance | Max 0.25 - 0.35 mm (new typically 0.15-0.20 mm) |
| Main Bearing Clearance | Max 0.30 - 0.40 mm (new typically 0.20-0.25 mm) |
| Crankshaft Deflection | Max 0.05 - 0.08 mm difference between adjacent web readings |
| Turbocharger Rotor Axial Play | Max 0.2 - 0.3 mm |
| Turbocharger Rotor Radial Play | Max 0.3 - 0.5 mm |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors typically verify the engine's overall condition and the effectiveness of its maintenance regime. This includes reviewing Planned Maintenance System (PMS) records, logbooks, and lube oil analysis reports. They will witness the testing of critical safety devices such as the overspeed trip, low lube oil pressure shutdown, high jacket water temperature shutdown, and crankcase oil mist detector. Crankshaft deflection records and trends are closely scrutinized. If the engine is undergoing an overhaul, the surveyor will inspect opened components like cylinder heads, pistons, liners, and bearings for wear and damage. They also check for proper high-pressure fuel pipe shielding, leak detection arrangements, and the general cleanliness and securing of all engine components. Functionality of emergency stop systems and compliance with SOLAS regulations are also key points.
Estimated lifetime: 80,000 - 120,000 hours before major overhaul (e.g., crankshaft inspection, full strip-down), assuming diligent maintenance and component renewal.
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