International Harvester 666

International Harvester 666The International Harvester 666 is a 2WD utility tractor manufactured by International Harvester from 1972 to 1976. The

International Harvester 666 is equipped with one of two engines: a 5.1 L (312.0 cu·in) six-cylinder diesel engine or a 4.8 L (291.0 cu·in) six-cylinder gasoline engine and one of three transmissions: a sliding gear transmission with 5 forward and 1 reverse gear, hydrostatic transmission with infinite forward and reverse gears or a partial power shift transmission with 10 forward and 2 reverse gears and dry disc clutch.

The tractor could be equipped with the following engines:

  • International Harvester D312. It is a 5.1 L, 5,113 cm2, (312.0 cu·in) six-cylinder natural aspirated diesel engine with 98.0 mm (3.86 in) of the cylinder bore and 112.0 mm (4.41 in) of the piston stroke. The compression ratio rating is 17.0:1.
  • International Harvester C291. It is a 4.8 L, 4,767 cm2, (290.9 cu·in) six-cylinder natural aspirated gasoline engine. The cylinder bore is 95.0 mm (3.74 in) and the piston stroke is 112.0 mm (4.41 in). The compression ratio rating is 7.5:1.

The International Harvester 666 is equipped with hydrostatic power steering, dry disc brakes, open operator station, or two-post ROPS (optional).

International Harvester 666 Specifications

General Specifications
ModelInternational Harvester 666
Wheel base2,610 mm (102.8 in)
Ground clearance
Weight3,200 kg (7,055 lbs)
Fuel tank capacity
Cabin typeOpen operator station or Two-post ROPS (optional)
Engine modelInternational Harvester D312
Engine typeFour-stroke, liquid-cooled, inline
Fuel typeDiesel
Displacement5.1 L, 5,113 cm2, (312.0 cu·in)
Bore and stroke98.0 mm X 112.0 mm (3.86 in X 4.41 in)
Compression ratio17.0:1
Engine modelInternational Harvester C291
Engine typeFour-stroke, liquid-cooled, inline
Fuel typeGasoline
Displacement4.8 L, 4,767 cm2, (291.0 cu·in)
Bore and stroke95.0 mm X 112.0 mm (3.74 in X 4.41 in)
Compression ratio7.5:1
Transmission and chassis
Chassis4×2 2WD
Steering typeHydrostatic power
BrakesDry disc
Transmission model
Transmission typeSliding gear
Gears5 forward and 1 reverse
Transmission model
Transmission typeHydrostatic
GearsInfinite forward and reverse
Transmission modelTorque-Amplifier
Transmission typePartial power shift with dry disc clutch
Gears10 forward and 2 reverse
Speed Forward: 26.5 kmh (16.5 mph) Reverse: 4.8 (3 mph)
Front tires Ag: 7.50-16
Rear tires Ag: 15.5-38
Three-Point Hitch
Control type
Lift capacity (at ends)
PTO (Power take-off shaft)
Rear PTO typeIndependent
Rear PTO speed540 rpm
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