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9L6L34HLX

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

Technical data from manufacturer or class sources · not yet verified by a person​‍​‍⁠‍​‍⁠⁠⁠‍‌‍‌⁠​‍‍​
5,220 kWPower
9Cylinders
340 mmBore
460 mmStroke

The Niigata 9L6L34HLX is a 9‑cylinder, inline (L‑configuration) medium‑speed main engine delivering 5 220 kW at 600 rpm, featuring common‑rail fuel injection to meet IMO Tier III emissions.

Specifications

Technical data.reference — unverified

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ConfigurationL
Speed (rpm)600
Fuel TypeHFO/MGO
TechnologyCommon Rail Tier III
Power (kW)5220
Inspection

Inspector Detail ✓ verified

Common issues

  • Fuel system leaks due to worn common rail components
  • Cylinder liner wear and scoring
  • Exhaust valve seat wear and overheating
  • Turbocharger fouling and surge
  • Low compression in individual cylinders
  • Fuel pump and injector failures
  • Crankshaft and camshaft bearing wear

Inspection checklist

  • Cylinder head and valve condition
  • Piston and ring condition
  • Crankshaft and camshaft bearing clearances
  • Fuel system leaks and pressure tests
  • Turbocharger condition and performance
  • Exhaust gas boiler and economizer condition
  • Lubrication system condition and oil analysis
  • Cooling system condition and performance
  • Starting air system condition and performance

Service intervals

oil_change1000-1500 hours
fuel_filter_change500-1000 hours
air_filter_change1000-2000 hours
injector_overhaul5000-10000 hours
valve_overhaul10000-20000 hours

Typical wear limits

cylinder_liner0.5-1.0 mm wear limit
piston_ring0.5-1.5 mm wear limit
crankshaft_bearing0.1-0.5 mm wear limit
camshaft_bearing0.1-0.5 mm wear limit

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

Critical spares

  • Fuel injectors
  • Cylinder liners
  • Piston rings
  • Exhaust valves
  • Turbocharger components
  • Crankshaft and camshaft bearings
  • Lubrication system pumps and filters

Safety

  • High-pressure fuel system leaks and fires
  • Crankcase explosion risk due to oil mist and ignition sources
  • Scalding risk from hot surfaces and pipes
  • Electrical shock risk from faulty wiring and components

Class survey

The class surveyor will typically check the condition and performance of the main engine, including the fuel system, turbocharger, and cooling system, as well as the maintenance records and spare parts inventory to ensure compliance with regulatory requirements and classification society rules.

Estimated lifetime: 30000-50000 hours

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