6125AFM John Deere Marine Engine

6125AFM John Deere Marine Engine

The 6125AFM features a 6 cylinder engine with directed top-liner cooling, the flexibility of a heat exchanger or keel cooler, and 3-5% generator droop governing.


Watercooled Turbocharger and Exhaust Manifold

  • Cooler and quieter environment for vessel and crew
  • Reduced external connections eliminates hoses and fittings that can leak or break

Replaceable wet-type cylinder liners

  • Excellent heat dissipation
  • Hardened and precision machined for long life
  • Rebuild to original specifications

Directed Top-liner Cooling

  • Reduces upper liner temperature by as much as 100 degrees Fahrenheit (54 degrees Celsius)
  • Durable and reliable power cylinder components

Corrosion Resistant Components

  • Provides engine protection from the effects of seawater

Gear Auxiliary Drive

  • Optional auxiliary drive for wash-down pumps, hydraulic oil pumps, and air compressors

Heat exchanger or Keel Cooled

  • High-capacity heat exchanger designed for reliable operation in adverse conditions
  • Keel cooler or heat exchanger options provide application flexibility

High torque and low rated rpm

  • Enables the engine to turn larger propellers at lower speed for best efficiency
  • Excellent vessel control and maneuvering
  • Lower-rated rpm limits vibration and noise for better crew comfort

Fuel System

  • Electronically controlled high-pressure common rail fuel system provides precise fuel delivery with variable timing resulting in excellent fuel economy and excellent performance
  • 3-5% Generator Droop Governing
  • Self-diagnostics and protection
  • Electronic instrument panel with plain text messaging


  • US EPA Marine Tier II Compliant
  • IMO Compliant


Download the brochure

Number of Cylinders6
Displacement- cu. in (L)763 (12.5)
Bore and Stroke–in. (mm)4.56 x 5.06 (107×127)
Compression Ratio17.0:1
Engine TypeIn-line, 4-Cycle
Length–in. (mm)56.1 (1426)
Width–in. (mm)33.5 (850)
Height–in. (mm)44.8 (1138)
Weight, dry–lb (kg)3142 (1425)