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	8º BTDC		5º BTDC	8º 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

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

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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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