Old Ford Tractor '39-'64
Misc Specifications and Data

By: John Smith of Old Ford Tractors

Old Ford Tractor '39 - '64 Misc Specifications and Data

Spec8NNAA600800700900
WheelBase70"73.875"75.2"75.2"85.3"85.3"
Overall Length 115"118.875"121.4"121.8"132"132.4"
Overall Width 64.75"64.75"64.75"64.75"71.7"71.7"
Front Tread Width 48"-76"48"-76"52"-76" 52"-76" 8.3"-16.3"8.3"-16.3"
Rear Tread Width 48"-76"48"-76"52"-76"52"-76"56"-84"56"-84"
Ground Clearance 21"21"21"21"27.2"27.9"
Approx Shipping Weight 2410#2550#2750#2850#3100#3184#
Engine Type 4 cyl. "L" head4 cyl. OHV4 cyl. OHV4 cyl. OHV4 cyl. OHV4 cyl. OHV
Bore 3.188"3.4375"3.4375"3.90" 3.44"3.90"
Stroke3.75"3.60"3.60"3.60"3.60"3.60"
Displacement119.7 ci.134 ci.134 ci.172 ci.134 ci172 ci.
Compression Ratio 6.50:16.60:16.60:16.75:16.60:16.75:1
Firing Order 1-2-4-31-2-4-31-2-4-31-2-4-31-2-4-31-2-4-3
Idle Speed 400 RPM450-475 RPM450-475 RPM450-475 RPM450-475 RPM450-475 RPM
Maximum RPM (no load) 2000 RPM2000 RPM2200 RPM2400 RPM 2200 RPM 2400 RPM
Sleeves Cast Alloy IronCast Alloy IronCast IronCast IronCast IronCast Iron
Pistons Aluminum AlloyAluminum AlloyAluminum AlloyAluminum AlloyAluminum AlloyAluminum Alloy
Cooling System Type PressurePressurePressurePressurePressurePressure
Fan Four or Six BladeFour or Six BladeThree Blade Three Blade Three Blade Three Blade
Initial Timing @ 475 rpm 4º BTDC¹8º BTDC8º BTDC5º BTDC8º BTDC5º BTDC
Advance @ 2000 RPM 18º2²29º to 31º29º to 31º 26º to 28º29º to 31º26º to 28º
Point Gap .0153³.024 to .026.024 to .026.024 to .026.024 to .026.024 to .026
Spark Plug size 14MM14MM14MM14MM14MM14MM
Spark Plug Gap .025 to .028.025 to .028.025 to .028.025 to .028.025 to .028.025 to .028
Generator Type Two Brush, shunt woundTwo Brush, shunt woundTwo Brush, shunt woundTwo Brush, shunt woundTwo Brush, shunt woundTwo Brush, shunt wound
Generator Capacity 20 amps, 140w20 amps, 160w20 amps, 140w20 amps, 140w20 amps, 140w20 amps, 140w
Battery6 volt positive ground6 volt positive ground6 volt positive ground6 volt positive ground6 volt positive ground6 volt positive ground

- 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 Series9N2N8NNAA600700800900501601701801901
Fuel Capacity10 gallons 10 gallons 10 gallons 11 gallons 11 gallons 11 gallons 14 gallons 14 gallons 13 gallons 13 gallons 17 gallons 17 gallons
Cooling System 12 quarts 12 quarts 12 quarts 15 quarts 15 quarts 15 quarts 15 quarts 15 quarts 15 quarts 15 quarts 15 quarts 15 quarts 15 quarts
Crankcase Capacity6 quarts 6 quarts 6 quarts 5 quarts (with filter change) 5 quarts (with filter change) 5 quarts (with filter change) 5 quarts (with filter change) 5 quarts (with filter change) 5 quarts (with filter change) 5 quarts (with filter change) 5 quarts (with filter change) 5 quarts (with filter change) 5 quarts (with filter change) 5 quarts (with filter change)
Transmission Capacity- 4 speed5 Gallons¹5 Gallons¹5 Gallons¹5 q5 q6.5 q5 q6.5 q6.5 q6.5 q6.5 q6.5 q6.5 q
Transmission Capacity- 5 speed8 q8 q8 q8.5 q 8.5 q 8.5 q 8.5 q 8.5 q 8.5 q
Differential CapacitySee note 1See note 1See note 18.5 q8.5 q8 q11.5 q8 q8 q8 q8 q11.5 q 8 q
Hydraulic System Capacity See note 1 See note 1 See note 1 8 q 9 q 8 q 9 q 8 q 8 q 8 q 8 q 8 q 8 q
Steering Assembly CapacityN/AN/A1 pt.1 pt.1 pt.1 pt.1 pt.1 pt.1 pt.1 pt.1 pt.1 pt.1 pt.
Air Filter Oil Cup Capacityapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pints
Oil Pump GPM approximately 3.4 GPM @ 1400 RPM approximately 3.4 GPM @ 1400 RPM approximately 3.4 GPM @ 1400 RPM approximately 3.4 GPM @ 1400 RPM approximately 3.4 GPM @ 1400 RPM approximately 3.4 GPM @ 1400 RPM approximately 3.4 GPM @ 1400 RPM approximately 3.4 GPM @ 1400 RPM approximately 3.4 GPM @ 1400 RPM approximately 3.4 GPM @ 1400 RPM approximately 3.4 GPM @ 1400 RPM approximately 3.4 GPM @ 1400 RPM approximately 3.4 GPM @ 1400 RPM approximately 3.4 GPM @ 1400 RPM
Water Pump GPMapproximately 16 GPM @ 1400 RPM approximately 16 GPM @ 1400 RPM approximately 16 GPM @ 1400 RPM approximately 16 GPM @ 1400 RPM approximately 16 GPM @ 1400 RPM approximately 16 GPM @ 1400 RPM approximately 16 GPM @ 1400 RPM approximately 16 GPM @ 1400 RPM approximately 16 GPM @ 1400 RPM approximately 16 GPM @ 1400 RPM approximately 16 GPM @ 1400 RPM approximately 16 GPM @ 1400 RPM approximately 16 GPM @ 1400 RPM
Thermostatopen @ 160º- open @ 180º open @ 160º- open @ 180º open @ 160º- open @ 180º open @ 160º- open @ 180º open @ 160º- open @ 180º open @ 160º- open @ 180º open @ 160º- open @ 180º open @ 160º- open @ 180º open @ 160º- open @ 180º open @ 160º- open @ 180º open @ 160º- open @ 180º open @ 160º- open @ 180º open @ 160º- open @ 180º
Pressure Caprelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psi

Note 1 -  9N2N, 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 Series9N2N8NNAA600700800900501601701801901
2.248" - 2.249"2.248" - 2.249"2.248" - 2.249"2.248" - 2.249"2.4974" - 2.4988" 2.4974" - 2.4988" 2.4974" - 2.4988" 2.4974" - 2.4988" 2.4974" - 2.4988" 2.4974" - 2.4988" 2.4974" - 2.4988" 2.4974" - 2.4988" 2.4974" - 2.4988" 2.4974" - 2.4988"
Crankshaft End Play .002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006
Crankpin Diameter 2.094"2.094"2.094"2.2978" - 2.2988" 2.2978" - 2.2988" 2.2978" - 2.2988" 2.2978" - 2.2988" 2.2978" - 2.2988" 2.2978" - 2.2988" 2.2978" - 2.2988" 2.2978" - 2.2988" 2.2978" - 2.2988" 2.2978" - 2.2988"
Main Bearing Clearance .001 - .003.001 - .003.001 - .003.0007 - .0023 .0007 - .0023 .0007 - .0023 .0007 - .0023 .0007 - .0023 .0007 - .0023 .0007 - .0023 .0007 - .0023 .0007 - .0023 .0007 - .0023
Connecting Rod Bearing Clearance .001 - .0035 .001 - .0035 .001 - .0035 .002 - .0004 .002 - .0004 .002 - .0004 .002 - .0004 .002 - .0004 .002 - .0004 .002 - .0004 .002 - .0004 .002 - .0004 .002 - .0004
Connecting Rod Side Clearance .003 - .009 .003 - .009 .003 - .009 .003 - .009 .003 - .009 .003 - .009 .003 - .009 .003 - .009 .003 - .009 .003 - .009
Piston Pin Diameter .7501 - .7504 .7501 - .7504 .7501 - .7504 .9121 - .9123 .9121 - .9123 .9121 - .9123 .9121 - .9123 .9121 - .9123 .9121 - .9123 .9121 - .9123 .9121 - .9123 .9121 - .9123 .9121 - .9123
Piston Pin Length 2.837" - 2.092" 2.837" - 2.092" 2.837" - 2.092" 2.837" - 2.092" 2.837" - 2.092" 2.837" - 2.092" 2.837" - 2.092" 2.837" - 2.092" 2.837" - 2.092" 2.837" - 2.092"
Pin Clearance in Rod and Piston .0001 - .0003 .0001 - .0003 .0001 - .0003 .0001 - .0003 .0001 - .0003 .0001 - .0003 .0001 - .0003 .0001 - .0003 .0001 - .0003 .0001 - .0003
Connecting Rod Bushing I.D. .9122 - .9125 .9122 - .9125 .9122 - .9125 .9122 - .9125 .9122 - .9125 .9122 - .9125 .9122 - .9125 .9122 - .9125 .9122 - .9125 .9122 - .9125
Fitting New Piston in New Bore .0015.0015.0015.0015.0015.0015.0015.0015.0015.0015.0015.0015.0015
Fitting Used Piston in New Bore .002 .002 .002 .002 .002 .002 .002 .002 .002 .002 .002 .002 .002
Fitting Used Piston in Used Bore.003 .003 .003 .003 .003 .003 .003 .003 .003 .003 .003 .003 .003
Piston Ring Side Clearance- top ring .002 - .0035.002 - .0035.002 - .0035.002 - .0035.002 - .0035.002 - .0035.002 - .0035.002 - .0035.002 - .0035.002 - .0035
Piston Ring Side Clearance- second ring.0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid)
Piston Ring Side Clearance- oil ring.0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid)
Camshaft Bearing Clearance .001 - .002.001 - .002.001 - .002.0015 - 0.0035 .0015 - 0.0035 .0015 - 0.0035 .0015 - 0.0035 .0015 - 0.0035 .0015 - 0.0035 .0015 - 0.0035 .0015 - 0.0035 .0015 - 0.0035 .0015 - 0.0035
Camshaft Journal Diameter 1.797" 1.797" 1.797" 1.925" - 1.926" 1.925" - 1.926" 1.925" - 1.926" 1.925" - 1.926" 1.925" - 1.926" 1.925" - 1.926" 1.925" - 1.926" 1.925" - 1.926" 1.925" - 1.926" 1.925" - 1.926"
Camshaft Gear Lash .002 - .006 .002 - .006 .002 - .006 .002 - .006 .002 - .006 .002 - .006 .002 - .006 .002 - .006 .002 - .006 .002 - .006
Camshaft End Play .003 - .007 .003 - .007 .003 - .007 .003 - .007 .003 - .007 .003 - .007 .003 - .007 .003 - .007 .003 - .007 .003 - .007
Camshaft Block Bore Diameter 1.9275" - 1.9285" 1.9275" - 1.9285" 1.9275" - 1.9285" 1.9275" - 1.9285" 1.9275" - 1.9285" 1.9275" - 1.9285" 1.9275" - 1.9285" 1.9275" - 1.9285" 1.9275" - 1.9285" 1.9275" - 1.9285"
Rocker Arm Support Journal Diameter.780 - .781.780 - .781.780 - .781.780 - .781.780 - .781.780 - .781.780 - .781.780 - .781.780 - .781.780 - .781
Rocker Arm Running Clearance .002 - .004 .002 - .004 .002 - .004 .002 - .004 .002 - .004 .002 - .004 .002 - .004 .002 - .004 .002 - .004 .002 - .004
Valve Face Angle 46º 46º 46º 46º 46º 46º 46º 46º 46º 46º 46º
Valve Seat Angle 45º45º45º45º45º45º45º45º45º45º
Valve Seat Runout .002 .002 .002 .002 .002 .002 .002 .002 .002 .002
Valve Seat Width- intake.060 - .080 .060 - .080 .060 - .080 .060 - .080 .060 - .080 .060 - .080 .060 - .080 .060 - .080 .060 - .080 .060 - .080
Valve Seat Width- exhaust .090 - .110 .090 - .110 .090 - .110 .090 - .110 .090 - .110 .090 - .110 .090 - .110 .090 - .110 .090 - .110 .090 - .110
Valve Lash .014 - .016 .014 - .016 .014 - .016 .014 - .016 .014 - .016 .014 - .016 .014 - .016 .014 - .016 .014 - .016 .014 - .016
Valve Cap-to-Stem End Clearance .002 - .004 .002 - .004 .002 - .004 .002 - .004 .002 - .004 .002 - .004 .002 - .004 .002 - .004 .002 - .004 .002 - .004
Valve Guide Inside Diameter .3436 - .3444 .3436 - .3444 .3436 - .3444 .3436 - .3444 .3436 - .3444 .3436 - .3444 .3436 - .3444 .3436 - .3444 .3436 - .3444 .3436 - .3444 .3436 - .3444
Valve Stem-to-Guide Clearance .001 - .002 .001 - .002 .001 - .002 .001 - .002 .001 - .002 .001 - .002 .001 - .002 .001 - .002 .001 - .002 .001 - .002
Valve Stem Diameter- intake/red .3418 .3418 .3418 .3418 .3418 .3418 .3418 .3418 .3418 .3418 .3418 .3418 .3418
Valve Stem Diameter- intake/green .3423 .3423 .3423 .3423 .3423 .3423 .3423 .3423 .3423 .3423 .3423 .3423 .3423
Valve Stem Diameter- exhaust/red .3408 .3408 .3408 .3408 .3408 .3408 .3408 .3408 .3408 .3408 .3408 .3408 .3408
Valve Stem Diameter- exhaust/green .3413.3413.3413.3413.3413.3413.3413.3413.3413.3413.3413.3413.3413
Valve Timing- Intake Opens @ 15º before T.D.C 15º before T.D.C 15º before T.D.C 15º before T.D.C 15º before T.D.C 15º before T.D.C 15º before T.D.C 15º before T.D.C 15º before T.D.C 15º before T.D.C
Valve Timing- Intake Closes @ 35º after B.D.C 35º after B.D.C 35º after B.D.C 35º after B.D.C 35º after B.D.C 35º after B.D.C 35º after B.D.C 35º after B.D.C 35º after B.D.C 35º after B.D.C
Valve Timing- Exhaust Opens @ 41º before B.D.C 41º before B.D.C 41º before B.D.C 41º before B.D.C 41º before B.D.C 41º before B.D.C 41º before B.D.C 41º before B.D.C 41º before B.D.C 41º before B.D.C
Valve Timing- Exhaust Closes @ 15º after T.D.C 15º after T.D.C 15º after T.D.C 15º after T.D.C 15º after T.D.C 15º after T.D.C 15º after T.D.C 15º after T.D.C 15º after T.D.C 15º after T.D.C
Valve Lift- Intake .3553 .3553 .3553 .3553 .3553 .3553 .3553 .3553 .3553 .3553
Valve Lift- Exhaust .3370 .3370 .3370 .3370 .3370 .3370 .3370 .3370 .3370 .3370 .3370
Valve Rotators- exhaust Free spin Free spin Free spin Free spin Free spin Free spin Free spin Free spin Free spin Free spin Free spin Free spin Free spin
Valve Tappet Diameter .4989 - .4995 .4989 - .4995 .4989 - .4995 .4989 - .4995 .4989 - .4995 .4989 - .4995 .4989 - .4995 .4989 - .4995 .4989 - .4995 .4989 - .4995
Valve Tappet Bore Clearance .0005 - .0021 .0005 - .0021 .0005 - .0021 .0005 - .0021 .0005 - .0021 .0005 - .0021 .0005 - .0021 .0005 - .0021 .0005 - .0021 .0005 - .0021
Oil Pump Drive Shaft-to-Body Clearance .0015 - .0029 .0015 - .0029 .0015 - .0029 .0015 - .0029 .0015 - .0029 .0015 - .0029 .0015 - .0029 .0015 - .0029 .0015 - .0029 .0015 - .0029
Oil Pump Driven Gear-to-Pin Clearance .001 - .002 .001 - .002 .001 - .002 .001 - .002 .001 - .002 .001 - .002 .001 - .002 .001 - .002 .001 - .002 .001 - .002
Oil Pump Gear-to-Pump Body Side Clear. .005 max. .005 max. .005 max. .005 max. .005 max. .005 max. .005 max. .005 max. .005 max. .005 max.

Original Wheels and Tires

Model or SeriesFront TireRear Tire
9N4x1910x28
2N4x1910x28
8N¹4.00x1910x28
NAA²4.00x1910x28
600 Series5.50x1611x28
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 5.50x1611x28
7015.50x16 11x28
7415.50x16 11x28
771 5.50x1611x28
800 Series 6.00x1612x28
801 All Purpose Model 6.00x1612x28
801 Special Utility Model 5.50x1610x28
811 Special Utility Model 5.50x1610x28
821 Special Utility Model 5.50x1610x28
900 Series 5.50x1611x28
901 Series 5.50x1612x28

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

Tire Inflation Chart

Tire Size/PositionInflation PressureMax Lbs. Load Per Wheel
10.00x28 4-ply rear 16 psi1860
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 SizeGals of WaterLbs. of Calcium ChlorideTotal Weight Added
9:00 x 10 front 945 120
5:50 x 16 front 4.5 22.560
6:00 x 16 front 5.2 2669
6:50 x 16 front 5.9 29.579
7:50 x 16 front 9 45120
10:00 x 28 rear 24122 324
10:00 x 38 rear 31157416
11:00 x 28 rear 32160426
12:00 x 28 rear 39197525
12:00 x 38 rear 51 257685
13:00 x 24 rear 44219 584
13:00 x 28 rear 49246648
13:60 x 28 rear 39 197525
14.90 x 24 rear 44219584
14:90 x 28 rear 49246 648

Torque Specifications '53 - '64

Engine

HeaderHeader 2
Camshaft Thrust Plate to Cylinder Block10-16 ft.lbs.
Camshaft Gear to Camshaft 45-50 ft.lbs.
Carb Throttle Body to Fuel Bowl 36 in.lbs.
Connecting Rod Nuts45-50 ft.lbs.
Connecting Rod Pal Nuts 3-4 ft.lbs.
Crankshaft Pulley to Crankshaft 100-110 ft.lbs.
Cylinder Front Cover 15-18 ft.lbs.
Cylinder Head Bolts 65-70 ft.lbs.
Flywheel to Crankshaft 75-85 ft.lbs.
Hydraulic Pump Gear Cover to Cylinder Block 18-21 ft.lbs.
Main Bearing Cap Bolts 95-105 ft.lbs.
Manifolds to Cylinder Block 40-50 ft.lbs.
Governor Cylinder Front Cover 15-18 ft.lbs.
HeaderHeader 2
Oil Pan to Cylinder Block 15-18 ft.lbs.
Oil Filter to Cylinder Block 20-25 ft.lbs.
Oil Pump to Cylinder Block 30-35 ft.lbs.
Oil Tubes to Oil Pump Cover Plate 10-15 ft.lbs.
Rocker Arm Shaft Bolts 45-50 ft.lbs.
Spark Plugs 24-30 ft.lbs.
Valve Push Rod Chamber Cover 20-30 in.lbs.
Valve Rocker Arm Cover 8-10 ft.lbs.
Valve Rocker Arm Support to Cylinder Head 45-50 ft.lbs.
Water Outlet Elbow 8-10 ft.lbs.
Water Pump to Cylinder Block 15-18 ft.lbs.
Throttle Body to Fuel Bowl 36 in.lbs.
Governor Case to Front Cover 6-10 ft.lbs.

Transmission

Header 1Header 2
Engine Adapter Plate Nuts 25-30 ft.lbs.
Distributor Attaching Bolts 20-30 ft.lbs.
Interlock Cover Attaching Bolts 35-40 ft.lbs.
Lever Pin Retaining Bolt 90-110 ft.lbs.
P.T.O. Bearing Retainer Nuts 12-15 ft.lbs.
P.T.O. Hydraulic Fluid Line Fitting to Distributor 10-12 ft.lbs.
Pump Mounting Bolts 15-18 ft.lbs.
Header 1Header 2
Rear Support Mounting Bolts 35-40 ft.lbs.
Servo #1 Cover Attaching Bolt 20-25 ft.lbs.
Servo Actuating Lever Pin Nuts 100-120 ft.lbs.
Torque Limiting Clutch Mounting Bolts 25-30 ft.lbs.
Transmission Cover Attaching Bolts 18-23 ft.lbs.
Valve Body Mounting Bolts 5-8 ft.lbs.

Front Axle

Header 1Header 2
Axle Half to Center Axle Nut 135-150 ft.lbs.
Center Axle Pin 200 ft.lbs.
Radius Rod to Center Axle Nut 75-135 ft.lbs.
Radius Rod to Transmission Housing Nut 45-50 ft.lbs.
Spindle Arm to Spindle Nut 60-70 ft.lbs.
Support to Engine Nut 135-150 ft.lbs.

Rear Axle

Header 1Header 2
Axle Shaft Retainer or Final Drive Nuts 130-150 ft.lbs.
Axle to Center Housing Nuts 55-65 ft.lbs.
Axle to Center Housing Studs 40-45 ft.lbs.
Center Housing to Transmission Housing 40-50 ft.lbs.
Differential Case 90-100 ft.lbs.
Drive Gear Bolts 90-110 ft.lbs.
Thrust Block Bolts 25-30 ft.lbs.
Header 1Header 2
Lower Link Shaft Nut (inside) 150 ft.lbs.
P.T.O. Shifter Plate 40-55 ft.lbs.
Pinion Retainer Bolts 80-100 ft.lbs.
Relief Valve Plate Bolts 35-45 ft.lbs.
Wheel Lug Nuts 80 ft.lbs.
Axle Nut 450 ft.lbs.

Power Take-Off

Heading 1Heading 2
Belt Pulley Assembly to Center Housing Bolts35-40 ft.lbs.
Conversion to Center Housing Bolts 40-50 ft.lbs.
P.T.O. Conversion Cover Bolts 40-50 ft.lbs.
Heading 1Heading 2
P.T.O. Cover Bolts 35-40 ft.lbs.
Shift Cover Nuts 45 ft.lbs.
Shift Lever Studs 40-45 ft.lbs.

Steering

Heading 1Heading 2
Adapter to Steering Gear Housing 20-25 ft.lbs.
Sector Shaft Cover Bolts 25-30 ft.lbs.
Heading 1Heading 2
Steering Gear Housing to Transmission Housing 60-70 ft.lbs.
Steering Shaft Cover Retaining Screws 25-30 ft.lbs.

Old Ford Tractor PTO Horsepower Ratings

ModelPTO Speed at Engine RPMHorsepower
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

Thanks to John Smith of Old Ford Tractor for allowing us to use this information.