International Harvester Farmall A, AV, B, BN & U-2 Power Unit Service Manual 1939-1953 (P/N 57722 D)
Farmall Models Covered & Key Technical Specifications
Models: Farmall A, Farmall AV, Farmall B, Farmall BN, International A, U-2 Power Unit
Sub-models / Variants: 4-wheel tractors, High-clearance tractors, 3-wheel tractors, Industrial tractors
Model Years: 1939–1953
Serial Numbers: A: FAA-501 & up, AV: FAAV-48562 & up, B: FAB-3675 & up, BN: FAB-48349-X7/FABN-48459 & up, Int. A: IAA-57284 & up, U-2: UAA-501 & up
Technical Data:
- Engine: 4-cylinder wet sleeve, 3 x 4 inch bore and stroke
- Spark Plug Size: 18 mm, 7/8 hex
- Connecting Rod Bolt Torque: 37 ft. lb.
- Generator Output (Hot): 9 to 11 amp at approx. 1900 rpm
- Cooling System Capacity: 3-3/8 gallons
- Valve Clearance: 0.014 inch
Farmall Manual Features & Content Preview
- Covers 1939–1953 International Harvester Farmall A, AV, B, BN, International A tractors, and the U-2 Power Unit.
- OEM Publication P/N 57722 D.
- Features 80 detailed illustrations, including exploded views of the engine, carburetor, governor, transmission, and differential assemblies.
- Serves as the primary technical archive for restoring and maintaining the International Harvester A/B series tractor range.
Engine and Fuel System Architecture
This 71-page technical publication details the maintenance and assembly parameters for the 4-cylinder wet-sleeve engine used across the Farmall A, B, and U-2 Power Unit lineup. It outlines the complete engine teardown process, providing mechanics with exact specifications for connecting rods, bearings, crankshaft tolerances, and valve train geometry. Fuel system content focuses heavily on the Zenith and Marvel Schebler carburetor units. You will find breakdown and reassembly data alongside jet identification charts for various fuels, including gasoline, kerosene, and distillate options. Because working on vintage heavy machinery carries inherent physical risks, reviewing these factory specifications prior to wrenching is vital to ensure a safe shop environment and prevent equipment damage.
Drivetrain, Electrical, and Specification Highlights
The publication includes detailed transmission speed charts and electrical wiring schematics for the starter and generator systems. It highlights bevel gear adjustment parameters, specifically outlining tooth contact patterns for proper pitch line intersection. Engine specification tables document cylinder head bolt torque strictly at 65 ft. lbs. Valve guide data specifies intake valve stem clearance at 0.0015 to 0.0035 inches. The manual also lists complete cooling system capacities, noting 3-3/8 gallons for these specific units. This documentation delivers the exact dimensional data required for accurate bench work and reliable field service.
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