Main Engine 4-Stroke · Main Engines (4-Stroke)
This engine is commonly found on large commercial vessels, providing reliable propulsion power in a variety of marine environments. The 5LH21/32P engine operates at a steady 900 RPM and produces 1100 kW of power, using heavy fuel oil (HFO) or marine diesel oil (MDO) as fuel. It features a 210 mm bore and 320 mm stroke, resulting in a compression ratio of 17:1 and a stroke-to-bore ratio of 1.52. The engine's robust design includes a maximum combustion pressure of 200 bar and an injection pressure up to 2000 bar. Common maintenance challenges include piston cooling nozzle blockages, crankcase oil mist build-up, exhaust valve seat erosion, and fuel injection nozzle coking, all of which can be mitigated through regular inspections and adherence to manufacturer guidelines.
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