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8N Data

General

Wheelbase . . . . . . . . . . . . . . . . . . . . . . . . . . 70 inches
Over-all length . . . . . . . . . . . . . . . . . . . . . . 115 inches
Over-all height . . . . . . . . . . . . . . . . . . . 54 1/2 inches
Over-all width, normal tread . . . . . . . . 64 3/4 inches

Tire size:

Front standard . . . . . . . . . . . . . . . . . . . . . 4.00 – 19
optional . . . . . . . . . . . . . . . . . . . . . . 6.00 – 16
Rear standard. . . . . . . . . . . . . . . . . . . . . . . 11.2 – 28
Tread width . . . . . . . . .48 to 76 inches in 4-inch steps
Turning circle radius (with use of brakes):
Made by outer front wheel . . . . . . . . . . . . . . . . 8 ft.
Made by tractor centerline at rear axle . . 3 1/2 ft.
Shipping weight (including gasoline, oil, water, tires
with air, operator not included) . . . . . . . . 2,410 lbs.
Drawbar height . . . . . . . . . . . . . . . 8 1/2 to 34 1/4 in.

 

Capacities – U.S. Measure

Fuel tank . . . . . . . . . . . . . . . . . . . . . . . . . 10 gals. total
Engine oil pan. . . . . . . . . . . . . . . . . . . 6 qts. with filter
Transmission, hydraulics 80w90 . . . . . . . . . . . . 5 gals.
Cooling system . . . . . . . . . . . . . . . . . . . . . . . . . . 12 qts.
Oil bath air cleaner. . . . . . . . . . . . . . . . . . . . . . . 1 pint
Tire pressure:
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 lbs.
Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 lbs.

 

Engine

Type . . . . . . . . . . . . . . . . . . . . . . . 4-cylinder “L” head
Maximum Drawbar HP. 2nd Gear. . . . . . . . . . . . . 23.16
Maximun belt horsepower at 2000 R.P.M. . . . . . 27.32
Rated speeds . . . . . . . . . . 1500, 1750, and 2000 RPM.
Idle speed . . . . . . . . . . . . . . . . . . . . . . 400-450 R.P.M.
Cylinder bore. . . . . . . . . . . . . . . . . . . . . . . . . . 3.188 in.
Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.75 in.
Piston displacement . . . . . . . . . . . . . . . . . . . 119.7 cu. in.
Torque . . . . . . . . . . . . . . . . . . . . 92 lbs ft. at 1500 rpm
Compression ratio. . . . . . . . . . . . . . . . . . . . . . . . . 6.50:1
Sleeves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dry type
Piston. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aluminum
Rings. . . . . . . . . . . . . . . . . . . . Compression (2) Oil (1)
Piston pin . . . . . . . . . . . . . . . . . . . . . . . . . . Full floating
Rod bearings . . . . . . . . . . . . . . . Replaceable shell-type
Main bearings . . . . . . . . . . . . . . Replaceable shell-type
Crankshaft . . . Cast steel, static and dynamic balanced
Compression psi at cranking speed . . . . 90 psi minimum

Valve tappet clearance:

Intake . . . . . . . . . . . . . . . . . . . . . . . . .010 – .012 cold
Exhaust . . . . . . . . . . . . . . . . . . . . . . . .014 – .016 cold

Crankshaft journal:

Main bearing diameter . . . . . . . . . . 2.248 – 2.249 in.
Rod bearing diameter. . . . . . . . . . . . . . . . . . 2.094 in.

Torque specs:
Cylinder head:

stud nuts . . . . . . . . . . . . . . . . . . . . . . . . . 50-55 ft lb
bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . 65-70 ft lb
Main cap bolts . . . . . . . . . . . . . . . . . . . . . 75-85 ft lb
Rod cap bolts . . . . . . . . . . . . . . . . . . . . . . 35-40 ft lb

 

Ignition System

Firing order. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2-4-3
Initial timing . . . . . . . . . . . . . . . . 4 degrees before TDC
Maximum advance . . . . . . . . . . . . . . . . . . . . . . 18 degrees

Breaker points gap:

Side distributor. . . . . . . . . . . . . . . . . . .024 to .026 in.
Front distributor. . . . . . . . . . . . . . . . . . . . . . . . .015 in.
Spark plug gap . . . . . . . . . . . . . . . . . . . . ..025 to .028 in.

 

Carburetor

Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single up-draft
Make . . . . . . . . . . . . . . . . . . . . . . . . . . . Marvel-Schebler
Idle fuel adjustment . . . . . . . . . . . . . . . . . . . . . . . . 1 turn
Main fuel jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 turn

 

Thermostat

Location. . . . . . . . . . . . . . . . . . . . . In upper radiator hose
Starts to open . . . . . . . . . . . . . . . . . . . 160-l65 degrees F
Fully open . . . . . . . . . . . . . . . . . . . . . . 190-200 degrees F

 

Electrical System

Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-brush
Maximum output. . . . . . . . . . . . . . . . . . . . . . . . 20 Amps
Charging voltage. . . . . . . . . . . . . . . . . . . 7.1 to 7.5 volts

Battery:

Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-volt
Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Positive (+)

 

Transmission

Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Constantmesh
Number of speeds forward . . . . . . . . . . . . . . . . . . . . . . . 4

 

Clutch

Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single plate
Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 in.
Release bearing (pre-lubricated). . . . . . . . . . Ball bearing
Pedal free travel. . . . . . . . . . . . . . . . . . . . . . . . . . . 3/4 in.

 

Rear axle

Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Semi-floating
Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.66 to 1

 

Brakes

Type . . . . . . . . . . . . . . . . . . . . . . . . . . . Internal expanding
Brake pedal free play . . . . . . . . . . . . . . . . . . . . . . . 3/4 in.

Steering Gear

Type. . . . . . . . . . . . . . . . . . . . . . . . . . . Automotive ball nut
Ratio, turns of steering wheel for total travel of
pitman arms at 48 in. wheel tread. . . . . . . . . . . . . . . 2.25
Steering wheel diameter . . . . . . . . . . . . . . . . . . . . . . . 18 in.

 

Hydraulic Control

Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internal
Maximum pressure . . . . . . . . . . . . . . . . . . . . 1500-1700 psi

Pump:

Type. . . . . . . . . . . . . . . . . . . . . . . . . . Scotch Yoke piston
Drive. . . . . . . . . . . . . . . . . . Direct power take-off shaft

Capacity

2000 engine R.P.M. . . . . . . . . . . . . . . 2.85 gals per min
1500 engine R.P.M. . . . . . . . . . . . . . . . 2.15 gals per min
Control . . . . . . . . . . . . . . . . . . . . . . Manual and automatic
Oil supply . . . . . . . . . From transmission and differential

 

Power Take-off Adapter

Spline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1/8 in.
PTO Speed (@1500 engine R.P.M.). . . . . . . . . . . 545 R.P.M.

 

Tractor Performance

Maximum Drawbar H.P. 2nd Gear . . . . . . . . . . . . . . . . 23.16
Rated Drawbar H.P. 2nd Gear (75% max.) . . . . . . . . . 17.37
Maximum belt horsepower at 2000 R.P.M . . . . . . . . . 27.32
Rated belt horsepower (85% of max.) . . . . . . . . . . . . 23.22

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