Main Engine 4-Stroke · Main Engines (4-Stroke)
This diesel engine operates on a 4-stroke cycle with a sequential turbocharging system featuring two water-cooled turbochargers, designed for reliable and efficient marine propulsion. The MTU 16V4000 M73 delivers 2640 kW of power at 1800 rpm, utilizing MDO fuel. It features a robust V-configuration with 16 cylinders, each with a bore of 170 mm and a stroke of 190 mm. This engine is part of the MTU Series 4000 family and is built to comply with IMO Tier II and EPA standards, incorporating SCR technology for reduced emissions in its M05 variant. Common maintenance concerns include issues with raw water pump seals, turbocharger failures due to lubrication problems, fuel contamination, water-cooled exhaust manifolds suffering from internal corrosion, and neglect of the cooling system leading to overheating and cavitation issues.
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| Lube oil and filter change | typically every 500-1,000 running hours depending on oil analysis and duty cycle - confirm against MTU's schedule |
|---|---|
| Fuel filter/separator elements | typically every 500 hours or on a differential pressure alarm |
| Charge-air cooler cleaning/inspection | typically every 2,000-4,000 hours or on boost pressure deviation |
| Valve clearance check and adjustment | typically every 2,000-4,000 hours per maker schedule |
| Turbocharger inspection/overhaul | typically every 8,000-14,000 hours or per condition-monitoring trend |
| Injector service or exchange | typically every 6,000-10,000 hours, fuel-quality dependent |
| Coolant/corrosion inhibitor renewal | typically every 1-2 years |
| Piston ring end gap | typically 0.9-1.4 mm for this larger bore class when new/serviced - confirm against MTU's own manual for the wear limit |
|---|---|
| Cylinder liner bore wear | flag for attention once cumulative diametral wear approaches roughly 0.10-0.15% of bore diameter - confirm against MTU's stated limits |
| Main/big-end bearing clearance | typically 0.10-0.30 mm depending on journal size - confirm against maker limits |
| Injector opening pressure drift | flag for service once drift exceeds roughly 10% off the nominal setpoint |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Under Continuous Survey Machinery, class will typically check the running-hours log against maker-recommended intervals, recent lube oil analysis, turbocharger overhaul records, and evidence that governor/overspeed trip testing has been carried out and logged.
Estimated lifetime: Medium-speed engines of this 4000-series class are commonly cited with a major overhaul interval in the range of 20,000-30,000 running hours, with total service life extending well beyond that under a proper maintenance regime - confirm against MTU's own maintenance schedule.
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