Main Engine 4-Stroke · Main Engines (4-Stroke)
This is a powerful four-stroke dual-fuel marine diesel engine. It is the Wärtsilä 16W31DF, part of the W31DF family. This engine has 16 cylinders arranged in a linear configuration, with a bore of 310mm and a stroke of 430mm. It is capable of reaching 750 rpm and has a power output of 9760 kW. The 16W31DF is designed to operate on a variety of fuels, including LNG, HFO, MGO, and diesel. Its advanced technology meets Tier III emission standards. The engine features two-stage turbocharging with intercooling, common rail direct injection, and a valve layout of 2 inlet and 2 exhaust valves per cylinder. The 16W31DF has a piston speed of 10.75 m/s and a mean effective pressure (BMEP) of 30 bar. The engine's estimated weight is between 89 and 92.5 tonnes when dry. Wärtsilä emphasizes the engine's efficiency, claiming a specific fuel oil consumption (SFOC) of 167.7 g/kWh at its optimal point. This engine is in production, having been introduced in 2015, and has over 1,000 MW installed globally.
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| oil_change | 400-600 hours |
|---|---|
| fuel_filter_replacement | 1000-1500 hours |
| air_filter_replacement | 500-1000 hours |
| coolant_change | 2000-3000 hours |
| major_overhaul | 30000-40000 hours |
| cylinder_liner | 0.5-1.0 mm wear, depending on operating conditions |
|---|---|
| piston_ring | 0.5-1.5 mm wear, depending on operating conditions |
| exhaust_valve | 0.5-1.0 mm wear, depending on operating conditions |
| turbocharger_compressor_blade | 0.1-0.5 mm wear, depending on operating conditions |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors typically check for compliance with Tier III emissions regulations, as well as verification of engine performance and maintenance records
Estimated lifetime: 30000-40000 hours, depending on operating conditions and maintenance
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