Main Engine 4-Stroke · Main Engines (4-Stroke)
This is a marine diesel engine designed for propulsion applications. It is manufactured by Yanmar Power Technology Co., Ltd. and designated as the JYDXN20.4D6C. This engine, produced in 2018, falls under EPA Engine Family JYDXN20.4D6C and is categorized as IMO Category 1. It features a 6-cylinder, 4-stroke compression ignition cycle with a displacement of 20.4 liters per engine. The JYDXN20.4D6C is turbocharged with a direct injection fuel system. Rated at 555 kW at 1900 rpm, it delivers a maximum torque of 3773 Nm. This variable-speed engine is intended for use with a fixed-pitch propeller. Yanmar Power Technology Co., Ltd. recommends routine maintenance practices to ensure optimal performance and longevity. These practices include monitoring operating parameters such as oil pressure, coolant temperature, and exhaust temperatures, as well as inspecting various components like filters, coolers, and safety shutdown devices.
What our service work and the manufacturer documentation say about keeping this model running.
Review operating trends for lubricating-oil pressure, coolant temperature, exhaust temperatures, load balance, crankcase condition and abnormal vibration or noise. Inspect filters, coolers, fuel equipment, valve gear, turbocharging equipment, mounts, flexible connections and safety shutdown devices in accordance with the installed configuration. Check for fuel, oil, coolant and exhaust leakage and verify that protective alarms and shutdowns are functional. A surveyor will normally look for evidence of disciplined maintenance, clean machinery spaces, leak control, intact guards and reliable safety functions. Use the engine serial number and manufacturer documentation for all exact wear limits, adjustment values and overhaul criteria.
Useful onboard spares typically include fuel-system service items, lubricating-oil and fuel filters, cooling-system seals, belts where fitted, valve-train consumables, injector-related service parts, sensors and common gaskets or O-rings. Critical spares should be selected against the exact engine serial number, installed emissions package and vessel redundancy; refer to the manufacturer parts documentation before ordering.
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