Main Engine 4-Stroke · Main Engines (4-Stroke)
The Wärtsilä 10V31 is a medium‑speed, four‑stroke V‑type diesel engine delivering up to 5 600 kW at 750 rpm, renowned for its world‑leading specific fuel consumption (~165 g/kWh) and modular common‑rail design.
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| Cylinder liner and piston overhaul | medium-speed four-stroke engines of this bore class typically see major top-end overhaul in the 12,000-24,000 running hour range - confirm against Wartsila's own maintenance schedule for this model |
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| Fuel injector exchange or overhaul | commonly every 8,000-12,000 running hours depending on fuel quality - confirm against maker's schedule |
| Turbocharger overhaul | typically 16,000-24,000 running hours depending on maker recommendation |
| Lube oil analysis | monthly, or per maker's condition monitoring schedule |
| Valve clearance check | routine at intervals in the 2,000-4,000 running hour range, per maker's schedule |
| Cylinder liner bore wear | typically renewal is considered around 0.3-0.4% increase over nominal bore diameter for engines in this bore class - confirm against the engine's own manual |
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| Main bearing clearance | commonly in the range 0.20-0.40 mm depending on maker tolerance - confirm against the maker's manual |
| Piston ring end gap | typically 0.8-1.5 mm as installed for this bore class - confirm against the engine's own manual |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Commonly eligible for Continuous Survey Machinery (CSM) where the class society permits, with cylinder units, turbocharger and crankshaft deflection records examined on a rotating basis rather than a single fixed periodical survey. Running-hours log, oil analysis history and overhaul records are typically requested at survey.
Estimated lifetime: Medium-speed four-stroke engines of this size and class are commonly designed for a major top-end overhaul cycle in the 20,000-30,000 running hour range, with overall service life well beyond 100,000 hours given proper maintenance; actual life is installation- and duty-cycle-dependent.
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