Main Engine 4-Stroke · Main Engines (4-Stroke)
This marine propulsion engine is commonly found in vessels requiring variable speed propulsion with fixed pitch propellers, offering reliable performance across a range of maritime operations. The NMNBN12.4CO2 engine, with a displacement of 12.4 liters, delivers a rated power of 589 kW at 2300 RPM, while providing maximum torque of 2442 Nm under EPA test conditions. Its robust design includes a direct injection common rail fuel system and a turbocharged configuration, ensuring efficient combustion and performance. The engine is designed to comply with IMO Category 1 standards, making it suitable for a wide array of maritime applications. Common operational issues may arise from fuel injection deterioration, lubricating oil contamination, cooling system inefficiencies, charge air restrictions, and valve train wear. Regular maintenance is crucial, with onboard spares including filters, seals, belts, valve train consumables, and injector parts being essential for keeping the engine running smoothly. During service checks, it is important to monitor oil pressure, coolant temperature, exhaust temperatures, and overall load balance to ensure optimal operation and longevity of the engine.
Do you have the manufacturer datasheet for this model? Send it with the enquiry form — we check it and name the source.
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.
Free of charge — send us your request for MAN Truck & Bus SE equipment. Our team checks it and replies by e-mail.
Other models of the same equipment type, MAN Truck & Bus SE first.
Tell us what you need for this MAN Truck & Bus SE NMNBN12.4CO2 — a part, a service call, a second opinion. Are you MAN Truck & Bus SE? Claim this brand page.
Service engineer? Write the day report for this NMNBN12.4CO2 in OceanSphere Work — photos, hours and parts, as a PDF for the owner. Try it free for 14 days →
Yes. Specifications, documents and service notes for this model are readable without an account. An account adds saved searches and requests, nothing is taken away.
Yes. Tell us the manufacturer, the model and what you need — a person reads every request and replies by e-mail.
Send us the nameplate or the correct value. We check it against the manufacturer datasheet or class-society record and update the page.