Main Engine 4-Stroke · Main Engines (4-Stroke)
This marine engine employs a 4-stroke design with direct injection to optimize performance for heavy fuel oil or marine diesel oil, featuring a turbocharger and intercooler. The Wärtsilä 5LW64, part of the W64 family, is designed with a bore of 640 mm and a stroke of 900 mm, generating 9100 kW at 333 rpm. This configuration supports a specific cylinder power output of 2,000 to 2,150 kW per cylinder, with four valves per cylinder (two intake and two exhaust). The engine is optimized for gear propulsion and is equipped with a twin-plunger injection pump system. Common maintenance issues include abrasive wear on cylinder surfaces from fuel components, carbon buildup affecting piston rings, high wear on valve seats and stems under heavy load conditions, inefficiency in exhaust valve cooling due to extreme thermal stress, and deposits in the piston crown cooling gallery over extended maintenance intervals.
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