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Ford 8N
and other Ford tractor reference

 
 

Ford 8N Wiring Diagram


 

Ford 8N Cooling


 

 

 

 
  8N battery size (total high, length and width)
Battery sizes are standardized world wide "about" 8 wide X 10 long X 8 high.
 
 
 

 

 


Ford Serial Numbers

Serial number locationThe easiest way to identify the year of your N-series tractor is by the serial number. However, sometimes the number is unreadable or the engine has been swapped from another tractor. Hybrids (8N's with 9N engines or 9N's with 8N engines) are not uncommon. A lot of swapping has gone on over the last 50+ years and lots of engines were replaced with rebuilt units on an exchange basis. If that is the case, use the other identifying clues below to get a ballpark year. Serial numbers are located on the left side of the engine block, just below the head and behind the oil filter.

You may need to brush away a lot of rust and dirt before you can read the numbers, since they are usually not stamped very deep (or very straight). Try different angles and light sources to make the number visible. A star preceeding and following the number indicates .040" steel cylinder sleeves. A diamond indicates .090" cast iron sleeves. You will only see the diamond on 8N's with a serial number after 433578. All earlier models have the stars. The format for the serial number is *8N12345*. All serial numbers will begin with either 9N or 8N. All 2N serial numbers started with 9N. Note that the "font" used on the number stamps was a little different. The number "1" resembles an uppercase "I", the number "6" resembles a lower case "b", etc. Some casting codes on 8N engine blocks, transmission housings, and rear axle housings can also help pinpoint a date of manufacture. A code such as G187 would mean the part was cast on or after July 18th, 1947. The hydraulic pump housing is aluminum and has the actual casting date on it directly in front of the bottom drain plug. However, pumps have been changed over the years, so this date should only be considered to confirm other dating clues. Below are the serial number ranges and some of the features of the tractors in that range.
 

 
   
 

Fordson

9N

2N

8N

Golden Jubilee NAA

600,700,800,900

501,601,701,801,901

2000,4000,6000

1917

1

 

1918

255

 

1919

34422

 

1920

91712

 

1921

162667

 

1922

199448

 

1923

268433

 

1924

370331

 

1925

453341

 

1926

557509

 

1927

645611

 

1928

739583

 

1929

747584

 

1930

757265

(9N)

 

1939

 

1

 

1940

 

10234

 

1941

 

45976

(2N)

 

1942

 

88888

99003

 

1943

 

105375

 

1944

 

126538

 

1945

 

169982

 

1946

 

198731

(8N)

 

1947

 

258504

1

 

1948

 

37908

 

1949

 

141370

 

1950

 

245637

 

1951

 

343593

(Golden Jubilee, NAA)

 

1952

 

442035

1

 

1953

 

2380

(600,700,800,900)

 

1954

 

77475

1

 

1955

 

10615

 

1956

 

77271

(501,601,701,801,901)

 

1957

 

116368

1001

 

1958

 

11997

 

1959

 

58312

 

1960

 

105943

 

1961

 

131427

(2000,4000,6000)

1962

 

155531

1001

1963

 

11948

1964

 

38931

 

 

     
 


FORD 8N Specifications and 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.

Ford 8N 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:
          studs . . . . . . . . . . . . . . . . . . . . . . . . . . . 50-55 ft lb
          bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . 65-70 ft lb
       Main cap bolts . . . . . . . . . . . . . . . . . . . . . 75-85 ft lb
       Rod cap bolts . . . . . . . . . . . . . . . . . . . . . . 35-40 ft lb

Ford 8N 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.

Ford 8N Carburetor
    Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single up-draft
    Make . . . . . . . . . . . . . . . . . . . . . . . . . . . Marvel-Schebler
    Idle fuel adjustment . . . . . . . . . . . . . . . . . . . . . . . . 1 turn
    Main fuel jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 turn

Ford 8N Thermostat
    Location. . . . . . . . . . . . . . . . . . . . . In upper radiator hose
    Starts to open . . . . . . . . . . . . . . . . . . . 160-l65 degrees F
    Fully open . . . . . . . . . . . . . . . . . . . . . . 190-200 degrees F

Ford 8N Electrical System
    Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-brush
       Maximum output. . . . . . . . . . . . . . . . . . . . . . . . 20 Amps
       Charging voltage. . . . . . . . . . . . . . . . . . . 7.1 to 7.5 volts
    Battery:
       Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-volt
       Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Positive (+)

Ford 8N Transmission
    Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Constantmesh
    Number of speeds forward . . . . . . . . . . . . . . . . . . . . . . . 4

Ford 8N Clutch
    Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single plate
    Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 in.
    Release bearing (pre-lubricated). . . . . . . . . . Ball bearing
    Pedal free travel. . . . . . . . . . . . . . . . . . . . . . . . . . . 3/4 in.

Ford 8N Rear axle
    Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Semi-floating
    Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.66 to 1

Ford 8N Brakes
    Type . . . . . . . . . . . . . . . . . . . . . . . . . . . Internal expanding
    Brake pedal free play . . . . . . . . . . . . . . . . . . . . . . . 3/4 in.

Ford 8N 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.

Ford 8N 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

Ford 8N Power Take-off Adapter
    Spline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1/8 in.
    PTO Speed (@1500 engine R.P.M.). . . . . . . . . . . 545 R.P.M.

Ford 8N 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

 
 
 

2007 Harper Farms