3406C Standard Equipment

Exhaust System

  • Manifold & Turbocharger, watercooled
  • 152 mm (6 in) round flanged outlet on 1800 rpm
  • Elbow, dry, 152 mm (6 in) on 1800 rpm
  • Flange, dry, 152 mm (6 in) on 1800 rpm;

Air Inlet System

  • Aftercooler core, corrosion resistant coated (air side)
  • Air cleaner, Regular duty, dry, panel type with service indicator.
  • Turbocharger inlet, 152 mm (6 in) OD straight connection

Control System

  • Governor, Hydra-mechanica

Flywheels & Flywheel Housings

  • Flywheel, SAE No. 14
  • Flywheel housing, SAE No. 1
  • SAE standard rotation

Fuel System

  • Fuel filter, Spin on, LH
  • Fuel transfer pump
  • Fuel priming pump
  • Flexible fuel lines
  • Fuel ratio control


  • Instrument panel, LH
  • Engine Oil Pressure gauge
  • Engine water temperature gauge
  • Fuel pressure gauge

Lube System

  • Crankcase breather
  • Oil filter, Spin on, RH
  • Oil filler in valve cover and dipstick, RH
  • Oil pump, sump, manual

Mounting System

  • Front Support

Cooling System

  • Oil cooler
  • Thermostats and housing, Full open temperature 92 C (198 F)
  • Jacket water pump, gear driven, centrifugal
  • Auxiliary sea water pump, gear driven, rubber impeller, rotary, self priming (heat exchanger engines only)
  • Expansion tank
  • Marine transmission oil cooler

Starting/Charging System

  • Charging alternator
  • Electric starting motor, LH


  • Vibration damper
  • Lifting eyes
  • NOTE: Engines for keel cooling do NOT include keel cooler. Engines for heat exchanger cooling do NOT include heat exchanger.

3406C Optional Equipment


  • Elbow
  • Rain Cap
  • Flexible Fitting
  • Muffler
  • Duplex fuel filters
  • Water seperator


  • Engine mounted controls


  • Head exchanger - shipped loose
  • Dry charge coolant conditioner


  • Sump Pump


  • Ether starting aid
  • Battery Sets - 24 Volt - Dry


  • Engine Protective Cover
  • Storage Preservation
  • Export Packing


  • Tool set

Select Units


The mechanically governed 3406C marine propulsion engine is available “A” rating of 365 bhp (272 bkW) and a “B” rating of 400 bhp (298 bkW).

Power Rating

  • Power Range 365-400 bhp (272-298 bkW) 365-400 bhp (272-298 bkW)

Engine Specifications

  • Speed Range 1800 rpm 1800 rpm
  • Emissions Non-Certified Non-Certified
  • Aspiration TA TA
  • Bore 5.4 in 137.2 mm
  • Stroke 6.5 in 165.1 mm
  • Displacement 891.0 in³ 14.6 l
  • Rotation from Flywheel End Counterclockwise Counterclockwise
  • Configuration In-line 6, 4-Stroke-Cycle Diesel In-line 6, 4-Stroke-Cycle Diesel

Dimensions & Weights

  • Dry Weight - Approximate 2921.0 lb 1325.0 kg
  • Height 50.3 in 1278.5 mm
  • Length 57.3 in 1454.2 mm
  • Width 36.0 in 913.5 mm

Over 15 Years of Marine 3406C Caterpillar Production

Building on Years of Experience with 3400 Series Products

History of Proven Quality & Reliability

Caterpillar Global Dealer and Support Network

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