King Ranch Ag & Turf
Search Our Inventory: Row Crop Tractor
Search Our Inventory: John Deere 5075E
Search Our Inventory: Skid Steers
Search Our Inventory: John Deere 8370R
Search Our Inventory: Frontier Rotary Cutter
Search Our Inventory: Cotton Picker
Search Our Inventory: Lawn Mower
Search Our Inventory: John Deere Gator
Search Our Inventory: Tillage
Search Our Inventory: Zero-Turn Mower

John Deere 6068AFM85 Marine Propulsion Engine

Model Photo


  • 6.8L PowerTechâ„¢
  • 172-246 kW (230-330 hp) 



High torque and low rated RPM

  • High torque provides excellent vessel control and maneuverability. Lower rated propulsion RPM reduces vibration and noise for improved crew comfort.

4-valve cylinder head

  • Excellent airflow through 4-valve cylinder head delivers greater low-speed torque and better transient response time.

High-pressure common-rail (HPCR)

  • The HPCR fuel system provides variable common-rail pressure, multiple injections, and higher injection pressures. It also controls fuel injection timing and provides precise control for the start, duration, and end of injection. Electronic transfer pump is self-priming for ease of maintenance. Provides high performance, excellent fuel economy, and low emissions.

Water-cooled exhaust manifold

  • Integrated components eliminate external hoses and fittings. Wet exhaust manifold creates a cooler and quieter environment for passengers and crew.

Replaceable cylinder liners

  • Replaceable wet-type cylinder liners are precision-machined and hardened for long life. Allows engine to be rebuilt to original specifications.

Electronic engine control unit (ECU)

  • Advanced fault code diagnostics and customizable engine protections ensure reliability and uptime. Provides highly customizable features and trim to integrate your vessel.

Keel-cooled or heat exchanger

  • Closed cooling system in keel-cooled engine option eliminates the need for a sea strainer, seawater pump, or anodes. Heat exchanger option offers a lighter, more compact, and simpler engine installation.

Multiple service options

  • Either-side oil fill/dipstick combinations and remote oil and fuel filter options are available for easier service access.

Emissions Certifications

IMO Tier 2  
EPA Tier 3  
RCD 2  

General Data (based on standard option configuration)

Model 6068AFM85
Number of cylinders 6
Displacement--L(cu in) 6 (6)
Bore and Stroke-- mm (in) 107 x 127 (4.21 x 5.00)
Engine Type In-line, 4- Cycle
Aspiration Turbocharged and air-to-coolant aftercooled
Length - mm (in) 1489 (58.6)
Length to rear face of flywheel housing - mm (in) 1172 (46.1)
Width Maximum - mm (in) 862 (33.9)
Flywheel housing SAE 2
Height - mm (in) 935 (36.8)
Height, crankshaft centerline to top - mm (in) 644 (25.4)
Height, crankshaft centerline to bottom - mm (in) 291 (11.5)
Weight, dry - kg (lb) 787 (1735)

Engine Specifications

Performance Rating Power KW (bhp)
Rated Speed (rpm)
Rated fuel consumption L/hr(gal/hr)
M1 172 ( 230 )
M2 198 ( 266 )
57.9 ( 15.3 )
M3 224 ( 300 )
76.0 ( 20.1 )
M4 246 ( 330 )
71.2 ( 18.8 )

M rating

M1 - Typical annual usage (hr) Unrestricted
M1 - Typical full-power operation (hr) Uninterrupted
M1 - Typical load factor >65%
M2 - Typical annual usage (hr) 000-5
M2 - Typical full-power operation (hr) 16 of each 24 hr
M2 - Typical load factor <=65%
M3 - Typical annual usage (hr) 000-4
M3 - Typical full-power operation (hr) 4 of each 12 hr
M3 - Typical load factor <=50%
M4 - Typical annual usage (hr) 000-3
M4 - Typical full-power operation (hr) 1 of each 12 hr
M4 - Typical load factor <=40%