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Caterpillar Marine

6L3406C

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

Technical data from manufacturer or class sources · not yet verified by a person​‍​‍⁠‌⁠​‌​‌​‍‌​‍⁠​⁠‌
6Cylinders
137 mmBore
165 mmStroke

The Caterpillar 6L3406C is a medium‑speed, inline‑six diesel engine delivering around 360 kW at 2300 rpm, primarily used as the main propulsion unit on small to midsize vessels.

Specifications

Technical data.reference — unverified

Do you have the manufacturer datasheet for this model? Send it with the enquiry form — we check it and name the source.

ConfigurationL
Speed (rpm)2300
Fuel TypeMGO
TechnologyMechanical
Inspection

Inspector Detail ✓ verified

Common issues

  • Excessive cylinder liner wear due to poor fuel quality or inadequate maintenance
  • Fuel system leaks and contamination causing engine performance issues
  • Crankshaft bearing wear resulting from misaligned engine or improper installation
  • Turbocharger failure due to dirty or clogged air filters
  • Cooling system leaks and corrosion causing overheating
  • Low compression in cylinders leading to reduced engine power and efficiency
  • Exhaust system blockages causing backpressure and engine damage

Inspection checklist

  • Check engine oil and coolant levels
  • Inspect fuel system for leaks and contamination
  • Verify proper engine alignment and installation
  • Check turbocharger and exhaust system for blockages
  • Inspect cylinder liners and piston rings for wear
  • Check crankshaft and camshaft bearings for wear
  • Verify proper functioning of cooling system
  • Check air filters for cleanliness and condition
  • Inspect engine mounts and vibration dampers for condition

Service intervals

oil_change250-300 hours
fuel_filter_change500-600 hours
air_filter_change1000-1200 hours
coolant_change2000-2500 hours
valve_adjustment1000-1200 hours

Typical wear limits

cylinder_liner0.5-1.0 mm wear limit
piston_ring0.5-1.0 mm wear limit
crankshaft_bearing0.1-0.2 mm wear limit

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

Critical spares

  • Cylinder liners
  • Piston rings
  • Crankshaft bearings
  • Turbocharger
  • Fuel injectors
  • Engine oil filters
  • Air filters

Safety

  • Ensure proper ventilation in engine room to prevent accumulation of hazardous fumes
  • Use personal protective equipment when working with engine components
  • Be aware of hot surfaces and moving parts when inspecting or maintaining engine

Class survey

Class surveyor typically checks engine condition, maintenance records, and compliance with regulatory requirements, including those related to emissions and safety

Estimated lifetime: 15000-20000 hours

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