Main Engine 4-Stroke · Main Engines (4-Stroke)
This is a powerful marine diesel engine designed for auxiliary and genset applications. It is manufactured by MAN Energy Solutions and designated as the 9LL16/24. The engine is a four-stroke, in-line, turbocharged diesel engine with a mechanical technology. It features 9 cylinders with a bore of 160 mm and a stroke of 240 mm, operating at a speed of 1000 rpm. The engine can utilize both MGO and HFO as fuel. The 9LL16/24 is capable of generating 990 kW of power at 1200 rpm. Introduced in the 1990s, the engine is IMO Tier II compliant and over 3000 units have been sold globally.
Every value below comes from the manufacturer datasheet or class-society record on file for this model.
| Valve clearance check | 2000-3000 running hours |
|---|---|
| Fuel injector overhaul | 3000-6000 running hours |
| Cylinder head overhaul (valves) | 6000-12000 running hours |
| Piston overhaul / Cylinder liner inspection | 12000-18000 running hours |
| Main and connecting rod bearing inspection | 18000-24000 running hours |
| Turbocharger overhaul | 12000-24000 running hours |
| Major engine overhaul (top end) | 24000-36000 running hours |
| Major engine overhaul (bottom end) | 36000-48000 running hours |
| Cylinder liner wear (max ovality/taper) | 0.6 - 0.8 mm |
|---|---|
| Piston ring groove wear (axial clearance) | 0.15 - 0.20 mm (max) |
| Crankshaft main bearing clearance (max) | 0.15 - 0.25 mm |
| Connecting rod bearing clearance (max) | 0.10 - 0.20 mm |
| Exhaust valve seat recession (from new) | 0.5 - 1.0 mm |
| Valve spindle stem wear (max) | 0.05 - 0.10 mm |
| Crankshaft deflection (max between adjacent throws) | 0.05 - 0.10 mm |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors will typically verify the engine's maintenance history and adherence to the Planned Maintenance System (PMS). Key checks include witnessing engine trials (load, speed, emergency stop), inspecting safety devices (overspeed, low LO pressure, high CW temp shutdowns), and examining the integrity of the foundation bolts. A detailed inspection of the fuel oil system (piping, heaters, filters, leak detection), lube oil system (filters, coolers, pumps), and cooling water system (pumps, coolers, expansion tank) is standard. Periodically, crankcase inspections (bearings, crankshaft deflection, oil mist detector) and cylinder head removals for valve and piston inspection will be required as per class rules and running hours. Turbocharger and starting air system integrity are also critical points of inspection.
Estimated lifetime: 80000 - 120000 running hours (before major engine replacement or extensive rebuild)
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