Main Engine 4-Stroke · Main Engines (4-Stroke)
This engine operates on a 4-stroke compression ignition cycle with turbocharging and direct injection, designed for variable speed propulsion applications with fixed pitch propellers. The Yanmar JYDXN3.00D6H engine, produced by Yanmar Power Technology Co., Ltd., delivers a rated power of 191 kW at 4000 RPM, with a maximum torque of 552 Nm. It features a displacement of 3 liters across its six cylinders, each with a 0.4 liter displacement. This engine is certified under the EPA 2000-2025 regulations and falls under IMO Category 1. Common issues include fuel-injection deterioration, lubricating-oil contamination, cooling-system fouling, charge-air restriction, and valve-train wear, all of which can be mitigated with regular maintenance and the use of spare parts such as fuel filters, lubricating-oil filters, cooling-system seals, and valve-train consumables. Critical spares should be selected based on the specific engine serial number and installed emissions package to ensure compatibility and reliability.
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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