3.0L Diesel 270-HP Mercruiser Inboard Engine

3.0l 270 Diesel I B


Powerful and Compact

Redefining the standard in a powerful, compact and easy-to-service package


Mercury Diesel’s 3.0L engine simplifies maintenance by locating service points at the front of the engine. The oil, coolant, fuse box, seawater strainer, drive lube (sterndrive only) and power steering fluid (sterndrive only) service points are located at the front of the engine next to Mercury’s color-coded maintenance schedule to provide easy-to-understand service guidelines and easy-to-reach access.

Redefining the Standard.

The new Mercury Diesel 3.0L common-rail high-speed engine delivers exceptional performance and offers substantial improvements in acceleration and top speed – all made possible by a new water-cooled variable geometry turbocharger design (VGT). This matched system, plus a state-of-the-art engine control system, provides reduced time to plane and outstanding overall performance.

Reliability + Performance.

Enjoying your time on the water is more easily achieved with an engine that performs day in and day out. Mercury Diesel’s 3.0L engine is assembled in a state-of-the-art manufacturing facility that employs the latest in quality practices and control, ensuring ultimate confidence in reliability. Combine the reliability and performance of the Mercury Diesel 3.0L with Mercury’s proprietary SmartCraft system and a full suite of accessories that contribute to an unsurpassed boating experience.

Quiet Performer.

The Mercury Diesel 3.0L delivers exhilarating performance while minimizing noise and vibration, while the air filter doubles as a silencer that removes the turbo whine historically associated with diesel engines. The motor mounts are designed to minimize vibration. Having a conversation while cruising has never been easier.


Mercury diesels feature state-of-the-art anti-corrosion, including a thermostatically controlled closed water-cooled system. Water-cooled engine oil, gear oil and steering fluid decrease engine-room temperatures, extending engine life. The SeaCore® system is available for the ultimate in saltwater protection.


Power mhp / kW
  • 270
Bore and stroke
  • 3.27 x 6.62″ / 83 x 92 mm
Maximum RPM (WOT)
  • 4200
Engine type
  • V6
Displacement (L)
  • 3.0L
Dry Weight (engine only)
  • 348 Kg (767 lbs)
Dimensions (L x W x H)
  • 36.6 x 33.5 x 30.0″ / 931 x 851 x 784 mm
Peak Torque
  • 594 Nm @ 2200 rpm
Air Handling
  • Turbocharged and Aftercooled
Fuel System
  • High pressure common rail
  • Counter clockwise facing flywheel
Compression Ratio
  • 16.5:1
Fuel Pre-filtration requirement
  • Not required
Fuel lift pump
  • On engine
High pressure fuel pump
  • Bosch CP 4.2 w/ integrated gear lift pump
Valves per Cylinder
  • 4
  • Oil jet cooled
Fuel injectors
  • Bosch CRS 2.20 (Solenoid)
Glow Plugs
  • Standard equipment with Bosch glow plug control unit (GCU)
Air inlet (Starboard Rear)
  • Filtered and silenced
  • Honeywell VGT
Engine and turbocharger cooling
  • Closed cooled
  • Aftercooler, Engine Coolant, Engine Oil, Power Steering / Gear Oil and Fuel – All are tube and shell
Seawater pump inlet size
  • 38 mm (1.5 in)
Oil sump volume
  • 8.5 L
Dipstick range
  • 1.0 L
Oil maintenance interval
  • 200 hours or annually
Coolant Volume
  • 12 L
Flywheel size
  • 290 mm (11.42 in) SAE 8
Electrical system
  • 12 V, 110 A w/ conveniently located battery power and ground studs
MerCathode (Sterndrive only)
  • Engine mounted
Engine Stop
  • ECU Controlled
Engine Control Unit (ECU)
  • Bosch EDC17
  • Crank & cam position, intake manifold pressure/temp, compressor outlet temp, exhaust gas temp, fuel temp, rail pressure, water in fuel (WIF), oil pressure/temp, coolant temp, seawater pressure/temp, atmospheric pressure
Throttle and shift
  • Mercury DTS or Mechanical Cable
Helm and gauge compatibility
  • Mercury SmartCraft
Mercury Joystick Piloting
  • Compatible with Joystick Piloting for Inboards
Inboard: ZF 63A
  • 1.21, 1.56, 2.03, 2.52, 2.68
Inboard: ZF 63
  • 1.25, 1.75, 2.78
Inboard: ZF 68IV
  • 1.29, 1.56, 1.99
Inboard: ZF 45C
  • 1