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


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) Less

Engine Specifications

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

Dimensions & Weights

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

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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