New CAT Equipment

C7.1 High Performance Propulsion Engine

The C7.1 marine propulsion engine is ideal for recreational boating applications, specifically smaller vessels and motoryachts ranging from 25 -60 feet in size. The engine features a common rail fuel system enabling optimum combustion and low emissions. The engines provide noticeably quiet operation due to reduced combustion noise through advanced electronic control. Additionally, no visible smoke is emitted from the C7.1 engines during operation.

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    Learn more about the C7.1 High Performance Propulsion Engine


    • Dimensions & Weights
      Engine Dry Weight - Approximate
      1676 lb
      34.5 in
      Length - Engine
      43.1 in
      Width - Engine
      31.4 in
    • Engine Specifications
      Turbocharged, aftercooled
      4.13 in
      In-line 6, 4-Stroke-Cycle Diesel
      428 in³
      IMO II, U.S. EPA Tier 3, RCD II, China II
      Rotation from Flywheel End
      Speed Range
      2900 rpm
      5.31 in
    • Ratings
      Power Range
      400 bhp - 500 bhp (298 bkW - 373 bkW)
    • Water cooled turbocharger and exhaust manifold
    • Common rail fuel system
    • Corrosion resistant sea water aftercooler
    • Closed crankcase ventilation system
    • Starter motors - 12V or 24V
    • Fuel cooler
    • Integral engine oil cooler
    • Vibration damper and guard
    • Electric fuel priming pump
    • Self-tensioning multi-vee alternator drive belt
    • Gear driven sea water pump (rubber impeller)
    • Fin and tube type jacket water heat exchanger
    • Front and rear engine mounting brackets
    • Alternators - 24V 140 amp - 12V 175 amp
    • Transmission gear oil cooler (engine mounted)
    • Instrument Panels
    • Glow plugs
    • Jacket water heater
    • 6" water cooled exhaust elbow
    • Isolation mounts
    • Primary fuel filter/water separator (remote mount)
    • Selection of factory-fitted marine transmissions and oil hoses
    • Cabin heater (calorifier) connections
    • Triple groove PTO pulley (crankshaft mounted)
    • Flexible fuel hoses
    • Right-hand and high level left hand oil dipsticks