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John Deere 6135AFM85 Constant-Speed Auxiliary & Generator Engine

Model Photo


  • 13.5L PowerTechâ„¢
  • 278-334 kW (373-448 hp)



Optional low rpm operation

  • A lower speed option provides the user the ability to start the engine without going to the gen-set rated speed and allows the user to clutch in an accessory that may be driven by the engine.

4-valve cylinder head

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

Electronic unit injectors (EUI)

  • The EUI fuel system provides higher injection pressures. It also controls fuel injection timing and provides precise control for start, duration, and end of injection.

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

EPA Tier 3  
IMO Tier 2  

General Data (based on standard option configuration)

Model 6135AFM85
Number of cylinders 6
Displacement-- L (cu in) 13.5 (824)
Bore and Stroke-- mm (in) 132 x 165 (5.20 x 6.50)
Engine Type In-line, 4-cycle
Aspiration Turbocharged and air-to-coolant aftercooled
Length - mm (in) 1800 (70.9)
Width Maximum - mm (in) 1062 (41.8)
Length to rear face of flywheel housing - mm (in) 1425 (56.1)
Flywheel housing SAE 1
Height - mm (in) 1182 (46.5)
Height, crankshaft centerline to top - mm (in) 818 (32.2)
Height, crankshaft centerline to bottom - mm (in) 364 (14.3)
Weight, dry - kg (lb) 1410 (3109)

Calculated Generator-set Rating - 1800 RPM

Rated Speed Hz (rpm) 60 ( 1800 )
Generator efficiency % 88-92
Engine Power Prime kW (hp) 334 (447.9)
Power factor 0.8
Calculated generator set rating prime - kWe 294-307
Calculated generator set rating prime - kVA 367-384

Calculated Generator-set Rating - 1500 RPM

Rated Speed Hz (rpm) 50 ( 1500 )
Generator efficiency % 88-92
Engine Power Prime kW (hp) 278 (372.8)
Power factor 0.8
Calculated generator set rating prime - kWe 245-256
Calculated generator set rating prime - kVA 306-320