John Deere Model 40 Tractor
Detailed Service Specifications

ENGINE AND TRACTOR SPECIFICATIONS

Bore and Stroke (In.)

4 x 4

Displacement (Cu. In)

100.5

Compression Ration

6.5:1

Compression Pressure (Est.)

125

Rated RPM

1850

Idle RPM (Fast)

2025 +/- 25

Power Shaft RPM (At Rated Load)

560

Belt Speed (Ft./Min.)

3000

H.P. 100% Max Belt (Maximum belt hp corrected to sea level and 60 deg. F. air temp)

40 T

25.23

40 S

24.86

40 C

24.99

Shipping Weight (Lbs.)

40 T (with 9-34, 5.00x15 tires)

3000

40 S (with 9-24, 5.00x15 tires)

2750

40 U (with 10-24, 5.00x15 tires)

2850

40 W (with 10-34, 6.00x16 tires)

3000

40 V (with 11-34, 5.00x15 tires)

3050

40 H (with 10-38, 6.50x16 tires)

3400

40 C (with 12" shoes)

3-Roller - 4000
4-Roller - 4125
5-Roller - 4560

Spark Advance

25 degrees

Pulley Face (In.)

6

Rings per Piston

4

Distributor Automatic Advance

15 degrees

CAPACITIES

Fuel Tank (Gal.)

10.5

Starting Tank (All-Fuel) (Gal.)

.9

Crankcase with Filter (Qts.)

5

Transmission (Qts.)

40 T

7-1/2

40 S

6-1/2

40 C

6-1/2

Cooling System (Gal.)

3-1/2

Final Drive (Pts.)

40 C

1-3/4

40 H

1-1/2

40 S

1-1/2

40 T

4

40 U

2-1/2

40 V

3-1/2

40 W

2-1/2

Hydraulic System

40 C

9 Qts. (Remote Cyl. System)

40 C

11 Qts. (Integral System)

40 S

4-1/2 Qts.

40 T

5-1/2 Qts.

40 U

4-1/2 Qts.

VALVE DATA

Valve Spring (Lbs. @ In.)

39-45 @ 2

Valve Length (Intake) (In.)

5-3/4

Valve Length (Exhaust) (In.)

5-3/4

Stem Diameter (Both) (In.)

.3715/.3725

Face Angle (Intake)

30 degrees

Face Angle (Exhaust)

45 degrees

Head Diameter (Intake) (In.)

1-13/16

Head Diameter (Exhaust) (In.)

1-9/16

Seat Width (Intake) (In.)

1/8 +/- 1/64-0

Seat Width (Exhaust) (In.)

5/64 +/- 1/64-0

Concentricity Tolerance of Valve Seats, Intake & Exhaust

.002

Face of Head to Guide (In.)

2-3/32

Guide Inside Diameter (In.)

.3745/.3760

Recess (Diameter)

Intake (In.)

1-3/8

Exhaust (In.)

1-9/32

Tappet Adjustments (In.)

.012

Valve Lift

.372

Fit of Stem in Guides

.002-.0045

VALVE TIMING

Inlet Open

0 degrees TDC

Inlet Closes

50 degrees aBDC

Exhaust Open

45 degrees bBDC

Exhaust Closes

5 degrees aTDC

CAMSHAFT

Bearing Clearance (Front and Rear)

.0015/.0035

End Play

.003

Camshaft Bearing (In.)

1.812/1.813

Camshaft Journals (In.)

1.8095/1.8105

CRANKSHAFT

End Play (In.)

.003 to .007

Main Bearing Clearance (In.)

.001 to .0035

Main Bearing Diameter (In.)

2.399/2.4005

Main Bearing Journals (In.)

2.397/2.398

Rod Bearing (In.)

2.500/2.5016

Rod Journals (In.)

2.498/2.499

Rod Bearing Clearance (In.)

.001/.0035

PISTONS

Cylinder Bore Diameter (In.)

4.000/4.001

PISTON DIAMETER AT TOP OF SKIRT

Parallel to Piston Pin (In.)

3.985/3.987

Right Angles to Piston Pin (In.)

3.9940/3.9960

PISTON DIAMETER AT BOTTOM OF SKIRT

Parallel to Piston Pin (In.)

3.987/3.988

Right Angles to Piston Pin (In.)

3.9970/3.9960

Piston Pin Bore Diameter (In.)

1.1880/1.1883

Piston Pin Diameter (In.)

1.1877/1.1879

Piston Pin to Piston Pin Bore Clearance (In.)

.0002/.0007

Piston Pin to Piston Pin Bushing Clearance (In.)

.001/.0004

Piston Pin Bushing Diameter (In.)

1.1883/1.1886

PISTON RINGS

Ring Width

Upper Compression (In.)

3/32

Center Compression (In.)

3/32

Lower Compression (In.)

3/32

Oil Ring (In.)

1/4

Ring Side Clearance in Groove

Upper Compression

.0015/.003

Center Compression

.001/.0025

Lower Compression

.001/.0025

Oil Ring

.001/.0025

FLYWHEEL

Teeth on Ring

105

Spark Mark Index

25 degrees bTDC

TOUCH-O-MATIC PUMP

Output @ 0 Lbs. Pressure

9.3

Output @ 800 Lbs. Pressure

8.2

ROCKER ARM SHAFT

Diameter (In.)

.8100/.8105

Bushing Diameter (In.)

.812/.813