Old Ford Tractor '39-'64
Misc Specifications and Data
By: John Smith of Old Ford Tractors
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Old Ford Tractor '39 - '64 Misc Specifications and Data
Spec |
8N |
NAA |
600 |
800 |
700 |
900 |
Wheelbase |
70" |
73.875" |
75.2" |
85.3" |
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Overall Length |
115" |
118.875" |
121.4" |
121.8" |
132" |
132.4" |
Overall Width |
64.75" |
71.7" |
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Front Tread Width |
48"-76" |
52"-76" |
8.3"-16.3" |
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Rear Tread Width |
48"-76" |
52"-76" |
56"-84" |
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Ground Clearance |
21" |
27.2" |
27.9" |
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Approx Shipping Weight |
2410# |
2550# |
2750# |
2850# |
3100# |
3184# |
Engine Type |
4 cyl. "L" head |
4 cyl. OHV |
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Bore |
3.188" |
3.4375" |
3.90" |
3.44" |
3.90" |
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Stroke |
3.75" |
3.60" |
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Displacement |
119.7 ci. |
134 ci. |
172 ci. |
134 ci. |
172 ci. |
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Compression Ratio |
6.50:1 |
6.60:1 |
6.75:1 |
6.60:1 |
6.75:1 |
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Firing Order |
1-2-4-3 |
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Idle Speed |
400 RPM |
450-475 RPM |
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Maximum RPM (no load) |
2000 RPM |
2200 RPM |
2400 RPM |
2200 RPM |
2400 RPM |
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Sleeves |
Cast Alloy Iron |
Cast Iron |
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Pistons |
Aluminum Alloy |
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Cooling System Type |
Pressure |
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Fan |
Four or Six Blade |
Three Blade |
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Initial Timing @ 475 rpm |
4º BTDC1 |
8º BTDC |
5º BTDC |
8º BTDC |
5º BTDC |
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Advance @ 2000 RPM |
18º2 |
29º to 31º |
26º to 28º |
29º to 31º |
26º to 28º |
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Point Gap |
.0153 |
.024 to .026 |
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Spark Plug size |
14MM |
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Spark Plug Gap |
.025 to .028 |
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Generator Type |
Two Brush, shunt wound |
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Generator Capacity |
20 amps, 140w |
20 amps, 160w |
20 amps, 140w |
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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 |
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Cooling System |
12 quarts |
15 quarts |
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Crankcase Capacity |
6 quarts |
5 quarts (with filter change) |
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Transmission Capacity- 4 speed |
5 Gallons1 |
5 q |
6.5 q |
5 q |
6.5 q |
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Transmission Capacity- 5 speed |
8 q |
8.5 q |
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Differential Capacity |
See note 1 |
8.5 q |
8 q |
11.5 q |
8 q |
11.5 q |
8 q |
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Hydraulic System Capacity |
See note 1 |
8 q |
9 q |
8 q |
9 q |
8 q |
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Steering Assembly Capacity |
N/A |
1 pt. |
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Air Filter Oil Cup Capacity |
approximately 1.3 pints |
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Oil Pump GPM |
approximately 3.4 GPM @ 1400 RPM |
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Water Pump GPM |
approximately 16 GPM @ 1400 RPM |
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Thermostat |
open @ 160º- open @ 180º |
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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" |
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Crankshaft End Play |
.002 - .006 |
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Crankpin Diameter |
2.094" |
2.2978" - 2.2988" |
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Main Bearing Clearance |
.001 - .003 |
.0007 - .0023 |
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Connecting Rod Bearing Clearance |
.001 - .0035 |
.002 - .0004 |
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Connecting Rod Side Clearance |
.003 - .009 |
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Piston Pin Diameter |
.7501 - .7504 |
.9121 - .9123 |
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Piston Pin Length |
2.837" - 2.092" |
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Pin Clearance in Rod and Piston |
.0001 - .0003 |
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Connecting Rod Bushing I.D. |
.9122 - .9125 |
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Fitting New Piston in New Bore |
.0015 |
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Fitting Used Piston in New Bore |
.002 |
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Fitting Used Piston in Used Bore |
.003 |
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Piston Ring Side Clearance- top ring |
.002 - .0035 |
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Piston Ring Side Clearance- second ring |
.0015 - .003 (134cid) .002 - .0035 (172 cid) |
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Piston Ring Side Clearance- oil ring |
.0015 - .003 (134 cid) .002 - .0035 (172 cid) |
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Camshaft Bearing Clearance |
.001 - .002 |
.0015 - 0.0035 |
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Camshaft Journal Diameter |
1.797" |
1.925" - 1.926" |
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Camshaft Gear Lash |
.002 - .006 |
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Camshaft End Play |
.003 - .007 |
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Camshaft Block Bore Diameter |
1.9275" - 1.9285" |
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Rocker Arm Support Journal Diameter |
.780 - .781 |
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Rocker Arm Running Clearance |
.002 - .004 |
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Valve Face Angle |
46º |
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Valve Seat Angle |
45º |
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Valve Seat Runout |
.002 |
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Valve Seat Width- intake |
.060 - .080 |
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Valve Seat Width- exhaust |
.090 - .110 |
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Valve Lash |
.014 - .016 |
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Valve Cap-to-Stem End Clearance |
.002 - .004 |
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Valve Guide Inside Diameter |
.3436 - .3444 |
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Valve Stem-to-Guide Clearance |
.001 - .002 |
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Valve Stem Diameter- intake/red |
.3418 |
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Valve Stem Diameter- intake/green |
.3423 |
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Valve Stem Diameter- exhaust/red |
.3408 |
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Valve Stem Diameter- exhaust/green |
.3413 |
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Valve Timing- Intake Opens @ |
15º before T.D.C |
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Valve Timing- Intake Closes @ |
35º after B.D.C |
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Valve Timing- Exhaust Opens @ |
41º before B.D.C |
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Valve Timing- Exhaust Closes @ |
15º after T.D.C |
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Valve Lift- Intake |
.3553 |
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Valve Lift- Exhaust |
.3370 |
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Valve Rotators- exhaust |
Free spin |
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Valve Tappet Diameter |
.4989 - .4995 |
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Valve Tappet Bore Clearance |
.0005 - .0021 |
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Oil Pump Drive Shaft-to-Body Clearance |
.0015 - .0029 |
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Oil Pump Driven Gear-to-Pin Clearance |
.001 - .002 |
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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. |
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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 Tire size: Turning circle radius (with use of brakes): Capacities - U.S. Measure Tire pressure: Engine Valve tappet clearance: Torque specs: Ignition System Carburetor Thermostat Electrical System Transmission Clutch Rear axle Brakes Steering Gear Hydraulic Control Power Take-off Adapter Tractor Performance |
Model 9N-2N-8N Data Charts
Thanks to John Smith of Old Ford Tractor for allowing us to use this information.