Main Engine 4-Stroke · Main Engines (4-Stroke)
This marine engine employs a 4-stroke compression ignition cycle with a naturally aspirated design, featuring indirect injection to deliver efficient combustion. The IHI Agri-Tech LH3XN.761D20 model, introduced in 2020, is categorized under IMO Category 1 and is designed for variable speed propulsion with a fixed pitch propeller. It has a total displacement of 0.8 liters across three cylinders, each with a displacement of 0.2 liters. The engine is EPA certified and operates at a rated speed of 3200 RPM, producing 14 kW of power and 47 Nm of torque. Common issues can include fuel-injection deterioration, lubricating-oil contamination, cooling-system fouling, charge-air restriction, and valve-train wear. Maintenance typically involves regular inspection of filters, coolers, fuel equipment, valve gear, turbocharging equipment, mounts, flexible connections, and safety shutdown devices. Onboard spare parts commonly include fuel-system service items, lubricating-oil and fuel filters, cooling-system seals, belts, valve-train consumables, injector-related service parts, sensors, and gaskets or O-rings. For critical spares, refer to the manufacturer’s documentation to ensure compatibility with the specific engine serial number and installed emissions package.
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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