International Harvester 666 tractor specifications

1972 - 1976

Production

Production Manufacturer:International Harvester
Total built:9,367
Original price:$11,875
Torque amplifier was an option. In 1973, the hydrostatic version of the 666 was renamed the 70 Hydro.

International Harvester 666 Power

International Harvester 666 Power Drawbar (tested):58.01 hp
43.3 kW
PTO (tested):69.61 hp
51.9 kW
power test details ...

1972 - 1976

Nebraska Tractor Test 1151

Nebraska Tractor Test 1151
312 diesel Torque Amplifier 2WD November 3 - 14, 1973 Link: Nebraska Tractor Test 1151 file
PTO performance
Power at rated engine speed:	66.29 hp 49.4 kW
Fuel use:	4.7 gal/hour 17.8 l/hour
Drawbar performance
Max power:	58.01 hp 43.3 kW
Fuel use:	4.6 gal/hour 17.4 l/hour
Gear 3-Direct used for power test.
Max pull:	8,012 lbs 3634 kg
Gear 2-TA used for pull test.

Nebraska Tractor Test 1152

Nebraska Tractor Test 1152
Gasoline Torque Amplifier 2WD November 5 - December 3, 1973 Link: Nebraska Tractor Test 1152 file
PTO performance
Power at rated engine speed:	66.30 hp 49.4 kW
Fuel use:	12.0 gal/hour 45.4 l/hour
Drawbar performance
Max power:	57.29 hp 42.7 kW
Fuel use:	5.7 gal/hour 21.6 l/hour
Gear 3-Direct used for power test.
Max pull:	7,981 lbs 3620 kg
Gear 2-TA used for pull test.

Nebraska Tractor Test 1154

Nebraska Tractor Test 1154
Gasoline hydrostatic 2WD November 14 - December 3, 1973 Link: Nebraska Tractor Test 1154 file
PTO performance
Power at rated engine speed:	69.61 hp 51.9 kW
Fuel use:	6.9 gal/hour 26.1 l/hour
Power at rated PTO speed:	64.10 hp 47.8 kW
Fuel use:	5.8 gal/hour 22.0 l/hour
Drawbar performance
Max power:	53.86 hp 40.2 kW
Fuel use:	7.7 gal/hour 29.1 l/hour
Max pull:	8,427 lbs 3822 kg

Nebraska Tractor Test 1155

Nebraska Tractor Test 1155
Diesel hydrostatic 2WD November 14 - December 3, 1973 Link: Nebraska Tractor Test 1155 file
PTO performance
Power at rated engine speed:	69.51 hp 51.8 kW
Fuel use:	5.6 gal/hour 21.2 l/hour
Power at rated PTO speed:	65.41 hp 48.8 kW
Fuel use:	5.3 gal/hour 20.1 l/hour
Drawbar performance
Max power:	53.10 hp 39.6 kW
Fuel use:	5.6 gal/hour 21.2 l/hour
Max pull:	8,310 lbs 3769 kg

International Harvester 666 Engines

International Harvester 666 Engines International Harvester 5.1L 6-cyl diesel International Harvester 4.8L 6-cyl gasoline Engine details ...

1972 - 1976

Engines overview

Engines overview
International Harvester 5.1L 6-cyl diesel
International Harvester 4.8L 6-cyl gasoline

Engine Detail

Engine Detail
International Harvester D312
diesel
6-cylinder
liquid-cooled
Displacement:	312 ci 5.1 L
Bore/Stroke:	3.875x4.410 inches 98 x 112 mm
Air cleaner:	dual stage dry
Compression:	17:1
Rated RPM:	2000
Starter volts:	12

Engine Detail

Engine Detail
International Harvester C291
gasoline
6-cylinder
liquid-cooled
Displacement:	291 ci 4.8 L
Bore/Stroke:	3.75x4.39 inches 95 x 112 mm
Air cleaner:	dual stage dry
Compression:	7.5:1
Rated RPM:	2000
Starter volts:	12

Mechanical

Mechanical Chassis:4x2 2WD
Steering:hydrostatic power
Brakes:dry disc
Cab:Open operator station. Two-post ROPS or canpoy optional.
Transmissions:5-speed
hydrostatic
10-speed partial power shift
Transmission details ...