Main Engine 4-Stroke · Main Engines (4-Stroke)
The Wärtsilä 9W46DF is a 9‑cylinder, low‑speed marine diesel engine delivering roughly 10 MW (≈13 800 hp) at 500–600 rpm and capable of running on LNG or conventional heavy fuel oil.
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| oil_change | every 1000-1500 hours |
|---|---|
| fuel_filter_replacement | every 500-1000 hours |
| air_filter_replacement | every 1000-2000 hours |
| exhaust_valve_overhaul | every 12,000-18,000 hours |
| cylinder_liner_replacement | every 20,000-30,000 hours |
| cylinder_liner | 0.5 mm wear limit |
|---|---|
| piston_ring | 0.5 mm wear limit |
| main_bearing | 0.1 mm wear limit |
| crankpin_bearing | 0.1 mm wear limit |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyor will typically check the condition of critical components, such as cylinder liners, piston rings, and main bearings, as well as the functionality of safety-critical systems, such as the LNG fuel system and fire suppression system.
Estimated lifetime: 40,000-60,000 hours before major overhaul
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