International Harvester 666: all source data
All 88 values recorded for this model, as the source lists them and in its units. The spec sheet shows the same data checked, typed and converted.
Overview
Production| Manufacturer | International Harvester |
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| (no label) | Row-Crop tractor |
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| (no label) | Built in Rock Island, Illinois, USA |
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| Total built | 9,367 |
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| Original price | $11,875 |
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| (no label) | Torque amplifier was an option. In 1973, the hydrostatic version of the 666 was renamed the 70 Hydro. |
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Engine| (no label) | International Harvester 5.1L 6-cyl diesel |
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| (no label) | International Harvester 4.8L 6-cyl gasoline |
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| Gas Fuel tank (Gas) | 33 gal | 124.9 L |
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| Diesel Fuel tank (Diesel) | 31 gal | 117.3 L |
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Transmission| (no label) | 5-speed |
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| (no label) | hydrostatic |
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| (no label) | 10-speed two-speed power shift |
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Power| Engine (gross) | 75 hp | 55.9 kW |
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| Drawbar (claimed) | 57 hp (gear) | 42.5 kW |
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| Drawbar (claimed) | 54 hp (hydro) | 40.3 kW |
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| PTO (claimed) | 65 hp (gear) | 48.5 kW |
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| PTO (claimed) | 69 hp (hydro) | 51.5 kW |
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| Drawbar (tested) | 58.01 hp | 43.3 kW |
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| PTO (tested) | 69.61 hp | 51.9 kW |
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Mechanical| (no label) | Two-wheel drive |
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| (no label) | Power steering |
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| (no label) | Dry disc brakes |
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| (no label) | Open operator station. Two-post ROPS or canopy optional. Cab available with air-conditioning. |
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Hydraulics| Type | open center |
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| Pump flow | 12 gpm | 45.4 lpm |
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Hitch| Rear Type | II |
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| Type | IH Fast Hitch |
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Pto| Rear PTO | independent |
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| Rear PTO Type | 540 (1.375) |
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Dimensions| Wheelbase | 103 inches | 261 cm |
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| Weight | 6780 to 7420 pounds |
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| Front tire | 7.50-16 |
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| Rear tire | 15.5-38 |
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Electrical| Charging system | alternator |
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| Battery volts | 12 |
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Engine
Engine options| (no label) | International Harvester 5.1L 6-cyl diesel |
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| (no label) | International Harvester 4.8L 6-cyl gasoline |
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Engine detail| (no label) | International Harvester D312 |
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| (no label) | diesel |
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| (no label) | 6-cylinder |
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| (no label) | liquid-cooled |
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| Displacement | 312 ci | 5.1 L |
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| Bore/Stroke | 3.875x4.410 inches | 98 x 112 mm |
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| Power (gross) | 75 hp | 55.9 kW |
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| Fuel system | direct injection |
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| Air cleaner | dual stage dry |
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| Compression | 17:1 |
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| Rated RPM | 2000 |
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| Starter volts | 12 |
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| Coolant capacity (Coolant) | 21 qts | 19.9 L |
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| (no label) | International Harvester C291 |
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| (no label) | gasoline |
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| (no label) | 6-cylinder |
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| (no label) | liquid-cooled |
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| Displacement | 291 ci | 4.8 L |
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| Bore/Stroke | 3.75x4.39 inches | 95 x 112 mm |
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| Power (gross) | 75 hp | 55.9 kW |
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| Air cleaner | dual stage dry |
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| Compression | 7.5:1 |
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| Rated RPM | 2000 |
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| Starter volts | 12 |
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| Coolant capacity (Coolant) | 21 qts | 19.9 L |
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Transmission
Transmission options| (no label) | 5-speed |
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| (no label) | hydrostatic |
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| (no label) | 10-speed two-speed power shift |
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Transmission| Transmission | sliding gear |
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| Gears | 5 forward and 1 reverse |
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| Type | hydrostatic |
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| Gears | infinite forward and reverse |
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| Transmission | Torque-Amplifier |
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| Type | two-speed power shift |
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| Gears | 10 forward and 2 reverse |
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| Clutch | dry disc |
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Dimensions
Tires| Ag front | 7.50-16 |
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| Ag rear | 15.5-38 |
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Dimensions| Wheelbase | 103 inches | 261 cm |
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| Length | 161 inches | 408 cm |
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| Width | 87 inches | 220 cm |
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| Height (steering wheel) | 77 inches | 195 cm |
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| Shipping weight | 6780 lbs (gas gear) | 3075 kg |
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| Shipping weight | 7420 lbs (diesel hydro) | 3365 kg |
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| Clearance (front axle) | 21 inches | 53 cm |
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| Clearance (drawbar) | 14 inches | 35 cm |
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| Bar rear axle (Bar) | 2.75 inch diameter | 69 mm |
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| Front tread | 50 to 74 inches | 127 to 187 cm |
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| Front tread | 56 to 80 inches | 142 to 203 cm |
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| Rear tread | 50 to 96 inches | 127 to 243 cm |
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