Old Ford Tractor '39-'64

Misc Specifications and Data

Spec

8N

NAA

600

800

700

900

Wheelbase

70"

73.875"

75.2"

85.3"

Overall Length

115"

118.875"

121.4"

121.8"

132"

132.4"

Overall Width

64.75"

71.7"

Front Tread Width

48"-76"

52"-76"

8.3"-16.3"

Rear Tread Width

48"-76"

52"-76"

56"-84"

Ground Clearance

21"

27.2"

27.9"

Approx Shipping Weight

2410#

2550#

2750#

2850#

3100#

3184#

Engine Type

4 cyl. "L" head

4 cyl. OHV

Bore

3.188"

3.4375"

3.90"

3.44"

3.90"

Stroke

3.75"

3.60"

Displacement

119.7 ci.

134 ci.

172 ci.

134 ci.

172 ci.

Compression Ratio

6.50:1

6.60:1

6.75:1

6.60:1

6.75:1

Firing Order

1-2-4-3

Idle Speed

400 RPM

450-475 RPM

Maximum RPM (no load)

2000 RPM

2200 RPM

2400 RPM

2200 RPM

2400 RPM

Sleeves

Cast Alloy Iron

Cast Iron

Pistons

Aluminum Alloy

Cooling System Type

Pressure

Fan

Four or Six Blade

Three Blade

Initial Timing @ 475 rpm

4º BTDC1

BTDC

5º BTDC

BTDC

5º BTDC

Advance @ 2000 RPM

18º2

29º to 31º

26º to 28º

29º to 31º

26º to 28º

Point Gap

.0153

.024 to .026

Spark Plug size

14MM

Spark Plug Gap

.025 to .028

Generator Type

Two Brush, shunt wound

Generator Capacity

20 amps, 140w

20 amps, 160w

20 amps, 140w

Battery

6 volt positive ground

1 - 9N, 2N, 8N prior to serial number 263844..... 0º TDC
2 - 9N, 2N, 8N prior to serial number 263844..... 25º BTDC.  
3 - 8N side distributor after serial number 263843......025".  



Capacities

Model or Series

9N

2N

8N

NAA

600

700

800

900

501

601

701

801

901

Fuel Capacity

10 gallons

11 gallons

14 gallons

13 gallons

17 gallons

Cooling System

12 quarts

15 quarts

Crankcase Capacity

6 quarts

5 quarts (with filter change)

Transmission Capacity- 4 speed

5 Gallons1

5 q

6.5 q

5 q

6.5 q

Transmission Capacity- 5 speed

8 q

8.5 q

Differential Capacity

See note 1

8.5 q

8 q

11.5 q

8 q

11.5 q

8 q

Hydraulic System Capacity

See note 1

8 q

9 q

8 q

9 q

8 q

Steering Assembly Capacity

N/A

1 pt.

Air Filter Oil Cup Capacity

approximately 1.3 pints

Oil Pump GPM

approximately 3.4 GPM @ 1400 RPM

Water Pump GPM

approximately 16 GPM @ 1400 RPM

Thermostat

open @ 160º- open @ 180º

Pressure Cap

relief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psi

Note 1 -  9N, 2N, and 8N has a common sump for the hydraulic oil which also provides lubrication to the transmission and differential.  
NAA and Hundred series tractors have separate reservoirs for transmission lubricant, hydraulic fluid, and differential lubricant.


Clearances

Model or Series

9N

2N

8N

NAA

600

700

800

900

501

601

701

801

901

Crankshaft Journal Diameter- Main

2.248" - 2.249"

2.4974" - 2.4988"

Crankshaft End Play

.002 - .006

Crankpin Diameter

2.094"

2.2978" - 2.2988"

Main Bearing Clearance

.001 - .003

.0007 - .0023

Connecting Rod Bearing Clearance

.001 - .0035

.002 - .0004

Connecting Rod Side Clearance

.003 - .009

Piston Pin Diameter

.7501 - .7504

.9121 - .9123

Piston Pin Length

2.837" - 2.092"

Pin Clearance in Rod and Piston

.0001 - .0003

Connecting Rod Bushing I.D.

.9122 - .9125

Fitting New Piston in New Bore

.0015

Fitting Used Piston in New Bore

.002

Fitting Used Piston in Used Bore

.003

Piston Ring Side Clearance- top ring

.002 - .0035

Piston Ring Side Clearance- second ring

.0015 - .003 (134cid)  .002 - .0035 (172 cid)

Piston Ring Side Clearance- oil ring

.0015 - .003 (134 cid)  .002 - .0035 (172 cid)

Camshaft Bearing Clearance

.001 - .002

.0015 - 0.0035

Camshaft Journal Diameter

1.797"

1.925" - 1.926"

Camshaft Gear Lash

.002 - .006

Camshaft End Play

.003 - .007

Camshaft Block Bore Diameter

1.9275" - 1.9285"

Rocker Arm Support Journal Diameter

.780 - .781

Rocker Arm Running Clearance

.002 - .004

Valve Face Angle

46º

Valve Seat Angle

45º

Valve Seat Runout

.002

Valve Seat Width- intake

.060 - .080

Valve Seat Width- exhaust 

.090 - .110

Valve Lash

.014 - .016

Valve Cap-to-Stem End Clearance

.002 - .004

Valve Guide Inside Diameter

.3436 - .3444

Valve Stem-to-Guide Clearance

.001 - .002

Valve Stem Diameter- intake/red

.3418

Valve Stem Diameter- intake/green

.3423

Valve Stem Diameter- exhaust/red

.3408

Valve Stem Diameter- exhaust/green

.3413

Valve Timing- Intake Opens @

15º before T.D.C

Valve Timing- Intake Closes @

35º after B.D.C

Valve Timing- Exhaust Opens @

41º before B.D.C

Valve Timing- Exhaust Closes @

15º after T.D.C

Valve Lift- Intake

.3553

Valve Lift- Exhaust

.3370

Valve Rotators- exhaust

Free spin

Valve Tappet Diameter

.4989 - .4995

Valve Tappet Bore Clearance

.0005 - .0021

Oil Pump Drive Shaft-to-Body Clearance

.0015 - .0029

Oil Pump Driven Gear-to-Pin Clearance

.001 - .002

Oil Pump Gear-to-Pump Body Side Clear.

.005 max.



Original Wheels and Tires

Model or Series

Front Tire

Rear Tire

9N

4x19

10x28

2N

4x19

10x28

8N 1

4.00x19

10x28

NAA2

4.00x19

10x28

600 Series

5.50x16

11x28

601 All Purpose Model

5.50x16

11x28

601 Special Utility Model

5.50x16

10x28

621 Special Utility Model

5.50x16

10x28

631 Special Utility Model

5.50x16

10x28

641 Special Utility Model

5.50x16

10x28

651 Special Utility Model

5.50x16

10x28

661 Special Utility Model

5.50x16

10x28

700 Series

5.50x16

11x28

701

5.50x16

11x28

741

5.50x16

11x28

771

5.50x16

11x28

800 Series

6.00x16

12x28

801 All Purpose Model

6.00x16

12x28

801 Special Utility Model

5.50x16

10x28

811 Special Utility Model

5.50x16

10x28

821 Special Utility Model

5.50x16

10x28

900 Series

5.50x16

11x28

901 Series

5.50x16

12x28

1- 5.50x16 front tires optional
2- 5.50x16 front and 11x28 rear optional.


Tire Inflation Chart

Tire Size/Position

Inflation Pressure

Max. Lbs. Load Per Wheel

10.00x28 4-ply rear

16 psi

1860

10.00x38 4-ply rear

16 psi

2155

11.00x28 4-ply rear

14 psi

2070

12.00x28 4-ply rear

14 psi

2430

12.00x38 4-ply rear

14 psi

2420

12.40x28 4-ply rear

14 psi

2070

13.00x24 4-ply rear

14 psi

2470

13.60x28 4-ply rear

14 psi

2430

14.00x24 4-ply rear

16 psi

3560

14.90x24 4-ply rear

18 psi

3125

14.90x28 4-ply rear

14 psi

2630

5.50x16 4-ply front

28 psi

1060

6.00x16 4-ply front

20 psi

755

6.50x16 6-ply front

28 psi

1050

7.50x16 8-ply front

44 psi

2390

9.00x16 8-ply front

49 psi

1620


Liquid Weight Chart

Tire Size Gals of Water Lbs. of Calcium Chloride Total Weight Added
9:00 x 10 front

9

45

120

5:50 x 16 front

4.5

22.5

60

6:00 x 16 front

5.2

26

69

6:50 x 16 front

5.9

29.5

79

7:50 x 16 front

9

45

120

10:00 x 28 rear

24

122

324

10:00 x 38 rear

31

157

416

11:00 x 28 rear

32

160

426

12:00 x 28 rear

39

197

525

12:00 x 38 rear

51

257

685

13:00 x 24 rear

44

219

584

13:00 x 28 rear

49

246

648

13:60 x 28 rear

39

197

525

14.90 x 24 rear

44

219

584

14:90 x 28 rear

49

246

648



Torque Specifications '53 - '64

Engine

Camshaft Thrust Plate to Cylinder Block

10-16 ft.lbs.

Oil Pan to Cylinder Block

15-18 ft.lbs.

Camshaft Gear to Camshaft

45-50 ft.lbs.

Oil Filter to Cylinder Block

20-25 ft.lbs.

Carb Throttle Body to Fuel Bowl

36 in.lbs.

Oil Pump to Cylinder Block

30-35 ft.lbs.

Connecting Rod Nuts

45-50 ft.lbs.

Oil Tubes to Oil Pump Cover Plate

10-15 ft.lbs.

Connecting Rod Pal Nuts

3-4 ft.lbs.

Rocker Arm Shaft Bolts

45-50 ft.lbs.

Crankshaft Pulley to Crankshaft

100-110 ft.lbs.

Spark Plugs

24-30 ft.lbs.

Cylinder Front Cover

15-18 ft.lbs.

Valve Push Rod Chamber Cover

20-30 in.lbs.

Cylinder Head Bolts

65-70 ft.lbs.

Valve Rocker Arm Cover

8-10 ft.lbs.

Flywheel to Crankshaft

75-85 ft.lbs.

Valve Rocker Arm Support to Cylinder Head

45-50 ft.lbs.

Hydraulic Pump Gear Cover to Cylinder Block

18-21 ft.lbs.

Water Outlet Elbow

8-10 ft.lbs.

Main Bearing Cap Bolts

95-105 ft.lbs.

Water Pump to Cylinder Block

15-18 ft.lbs.

Manifolds to Cylinder Block

40-50 ft.lbs.

Throttle Body to Fuel Bowl

36 in.lbs.

Governor Cylinder Front Cover

15-18 ft.lbs.

Governor Case to Front Cover

6-10 ft.lbs.

Transmission

Engine Adapter Plate Nuts

25-30 ft.lbs.

Rear Support Mounting Bolts

35-40 ft.lbs.

Distributor Attaching Bolts

20-30 ft.lbs.

Servo #1 Cover Attaching Bolt

20-25 ft.lbs.

Interlock Cover Attaching Bolts

35-40 ft.lbs.

Servo Actuating Lever Pin Nuts

100-120 ft.lbs.

Lever Pin Retaining Bolt

90-110 ft.lbs.

Torque Limiting Clutch Mounting Bolts

25-30 ft.lbs.

P.T.O. Bearing Retainer Nuts

12-15 ft.lbs.

Transmission Cover Attaching Bolts

18-23 ft.lbs.

P.T.O. Hydraulic Fluid Line Fitting to Distributor

10-12 ft.lbs.

Valve Body Mounting Bolts

5-8 ft.lbs.

Pump Mounting Bolts

15-18 ft.lbs.

Front Axle

Axle Half to Center Axle Nut

135-150 ft.lbs.

Radius Rod to Transmission Housing Nut

45-50 ft.lbs.

Center Axle Pin

200 ft.lbs.

Spindle Arm to Spindle Nut

60-70 ft.lbs.

Radius Rod to Center Axle Nut

75-135 ft.lbs.

Support to Engine Nut

135-150 ft.lbs.

Rear Axle

Axle Shaft Retainer or Final Drive Nuts

130-150 ft.lbs.

Lower Link Shaft Nut (inside)

150 ft.lbs.

Axle to Center Housing Nuts

55-65 ft.lbs.

P.T.O. Shifter Plate

40-55 ft.lbs.

Axle to Center Housing Studs

40-45 ft.lbs.

Pinion Retainer Bolts

80-100 ft.lbs.

Center Housing to Transmission Housing

40-50 ft.lbs.

Relief Valve Plate Bolts

35-45 ft.lbs.

Differential Case

90-100 ft.lbs.

Wheel Lug Nuts

80 ft.lbs.

Drive Gear Bolts

90-110 ft.lbs.

Axle Nut

450 ft.lbs.

Thrust Block Bolts

25-30 ft.lbs.

Power Take-Off

Belt Pulley Assembly to Center Housing Bolts

35-40 ft.lbs.

P.T.O. Cover Bolts

35-40 ft.lbs.

Conversion to Center Housing Bolts

40-50 ft.lbs.

Shift Cover Nuts

45 ft.lbs.

P.T.O. Conversion Cover Bolts

40-50 ft.lbs.

Shift Lever Studs

40-45 ft.lbs.

Steering

Adapter to Steering Gear Housing

20-25 ft.lbs.

Steering Gear Housing to Transmission Housing

60-70 ft.lbs.

Sector Shaft Cover Bolts

25-30 ft.lbs.

Steering Shaft Cover Retaining Screws

25-30 ft.lbs.



Old Ford Tractor PTO Horsepower Ratings

Info from the Nebraska tractor tests

Model

PTO Speed at Engine RPM

Horsepower

9N

727 @ 2000

23.6

8N ('47-'48)

727 @ 2000

23.6

8N ('49-'52)

727 @ 2000

26.2

Jubilee/NAA

727 @ 2000

31.1

640- Gas

727 @ 2000

31.0

640- LP

727 @ 2000

28.4

660- Gas

685 @ 2000

34.2

740- Gas

727 @ 2000

31.6

850- LP

685 @ 2000

39.5

860- Gas

685 @ 2000

45.4

960- Gas

685 @ 2000

46.3

621, 631, 641, 741- Gas

727 @ 2000

33.6

651, 661- Gas

685 @ 2000

35.8

821, 841, 941- Gas

727 @ 2000

44.7

851, 861, 951, 961- Gas

685 @ 2000

48.4

541D, 641D, 741D- Diesel

727 @ 2000

31.8

821D, 841D, 941D- Diesel

727 @ 2000

39.9

851D, 861D, 951D, 961D- Diesel

685 @ 2000

42.0

841L- LP

727 @ 2000

42.0

Select-O-Speed 671, 681, 771- Gas

693 @ 2000

34.3

Select-O-Speed 671, 681, 771- Diesel

693 @ 2000

31.6

Select-O-Speed 671, 681, 771- LP

693 @ 2000

32.6

Select-O-Speed 871, 971- Gas

693 @ 2000

46.2

Select-O-Speed 871, 881, 971, 981-Diesel

693 @ 2000

41.4

Select-O-Speed 871, 881, 971, 981- LP

693 @ 2000

43.6



Model 8N Operators Manual 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


Model 9N-2N-8N Data Charts


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