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6LL32/40

Main Engine 4-Stroke · Main Engines (4-Stroke)

Technical data from manufacturer or class sources · not yet verified by a person​‍​‍⁠‌‍‌​‌⁠​​‌⁠​⁠‌⁠‌
3,000 kWPower
6Cylinders
320 mmBore
400 mmStroke

The MAN L32/40 is a medium‑speed, six‑cylinder, four‑stroke diesel engine delivering up to 3 000 kW at 750 rpm, notable for its common‑rail fuel system and two‑stage intercooling which give high power density and low specific fuel consumption.

Specifications

Technical data.reference — unverified

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Cylinder displacement32 L/cylinder
Power per cylinder500 kW/cyl
Mean Effective Pressure (MEP)25.9 bar (720 rpm) / 24.9 bar (750 rpm)
Mean piston speed9.6 m/s (720 rpm)
Specific fuel oil consumption (100% MCR)186 g/kWh
Specific fuel oil consumption (85% load)183 g/kWh
Lube oil consumption0.5 g/kWh
Dry mass (6L32/40)38 tonnes
Dry mass (8L32/40)47 tonnes
Dry mass (12V32/40)61 tonnes
Dry mass (18V32/40)85 tonnes
Compression ratio4.5
TurbochargingTwo-stage intercooling with advanced turbocharger
Charge air systemTwo-stage charge air cooler (HT and LT circuits)
Engine typeFour-stroke turbocharged Diesel, non-reversible (propulsion models)
ConfigurationL
Speed (rpm)750
Fuel TypeMGO/HFO
TechnologyCommon Rail
Power (kW)3000
Inspection

Inspector Detail ✓ verified

Common issues

  • Cylinder liner wear - formation of wear ridge at top of liner, potential piston ring breakage
  • Fuel system leaks and contamination, particularly with MGO and HFO
  • Common Rail system faults, including faulty injectors and pump failures
  • Excessive engine vibration due to imbalance or misalignment
  • Lubrication system issues, including oil leaks and filter clogging
  • Cooling system problems, such as leaks or corrosion
  • Turbocharger fouling and failure

Inspection checklist

  • Cylinder head and liner condition
  • Piston ring and cylinder wall wear
  • Fuel system filters and injectors
  • Common Rail system components, including injectors and pumps
  • Lubrication system oil levels and filter condition
  • Cooling system leaks and corrosion
  • Turbocharger condition and performance
  • Engine vibration and balance
  • Exhaust system condition and emissions

Service intervals

oil_change400-600 hours
fuel_filter_change200-400 hours
air_filter_change100-200 hours
coolant_change2000-4000 hours

Typical wear limits

cylinder_liner0.5-1.0 mm wear on diameter
piston_ring0.5-1.0 mm wear on groove width
fuel_injector10-20% reduction in flow rate
turbocharger_wheel10-20% reduction in efficiency

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

  • Cylinder liners
  • Piston rings
  • Fuel injectors
  • Common Rail system components, including pumps and injectors
  • Lubrication system filters and pumps
  • Cooling system pumps and heat exchangers
  • Turbocharger components, including wheels and bearings

Safety

  • Fuel system leaks and fires
  • Engine room ventilation and gas detection
  • Crane and lifting operations near the engine
  • Electrical system safety, including grounding and insulation
  • Personal protective equipment, including hearing and eye protection

Class survey

The class surveyor will typically check the engine's condition, including cylinder head and liner wear, piston ring condition, and fuel system leaks. They will also verify that the engine is properly maintained, including regular oil changes and filter replacements, and that all safety equipment is functioning properly.

Estimated lifetime: 20000-30000 hours

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