Main Engine 4-Stroke · Main Engines (4-Stroke)
In a dual-fuel configuration optimized for both LNG and heavy fuel oil, Wärtsilä's 7W46DF engine harnesses advanced technology to achieve a peak power output of 8015 kilowatts at 600 revolutions per minute. Designed with an L-type layout featuring seven cylinders, each cylinder operates with dual intake and exhaust valves, ensuring efficient combustion. The 460-millimeter bore and 580-millimeter stroke work in tandem to deliver robust performance. Manufactured since 2004 at the Trieste facility, this engine has accumulated over 7.2 million operational hours, showcasing its reliability and efficiency with a specific fuel oil consumption range of 170-173 grams per kilowatt-hour ISO. Common failures include valve corrosion due to poor fuel quality, which can lead to turbine damage from valve failure, necessitating regular inspections every 4-8 weeks to monitor cylinder liner wear and piston crown conditions.
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| oil_change | 1000-1500 hours |
|---|---|
| fuel_filter_replacement | 500-1000 hours |
| air_filter_replacement | 1000-2000 hours |
| exhaust_valve_overhaul | 12000-18000 hours |
| cylinder_liner_replacement | 20000-30000 hours |
| cylinder_liner | 0.5-1.0 mm wear limit |
|---|---|
| piston_ring | 0.5-1.0 mm gap limit |
| crankshaft_bearing | 0.1-0.5 mm clearance limit |
| exhaust_valve | 0.1-0.5 mm clearance limit |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyor typically checks for compliance with classification society rules and regulations, including verification of maintenance records, inspection of critical components, and review of safety procedures
Estimated lifetime: 30000-50000 hours
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