International Harvester Farmall A, AV, B, BN & U-2 Power Unit Service Manual 1939-1953
Farmall A, AV, B, BN & U-2 Power Unit troubleshooting and repair reference: Engine, transmission, clutch, and electrical systems. PN 57722 D
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Models Covered & Key Technical Specifications
International Harvester Farmall A, AV, B, BN & U-2 Power Unit (57722 D) -- 1939-1953 Farmall A, AV, B, BN & U-2 Power Unit | Comprehensive Service & Repair Guide Documentation-Set.
- Design Wattage Specs: 18 amp establishes the maximum generator output range.
- Verified Generation Capacity: 16 amp signifies the generator's capacity at 7.7 volts.
- Nominal Burn-in Temperature: 7.6V for hot operation indicates optimal performance.
- Design Enclosure Specs: 18 mm x 7/8 hex determines the spark plug size specification.
- Engineered Fastener Specs: 37 ft. lb. secures the connecting rod bolts properly.
- Essential Electrical Specs: 1.5-inch clearance is required for the idle adjusting screw.
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Integrated Performance Assembly Manual: International Harvester Farmall A, AV, B, BN & U-2 Power Unit 1939-1953 - Comprehensive Service & Repair Guide Documentation-Set
System-Identifier: Farmall A, AV, B, BN & U-2 Power Unit // Operational-Scope: Complete Tractor and Power Unit Repair // System-Identifier: Comprehensive Service & Repair Guide
Component Overview
| Component | System-Path | Calibration-Standards |
|---|---|---|
| Engine | 4-Cylinder, 113 cu. in. | 900-1400 RPM Governor Speed |
| Transmission | 4-Speed Forward, 1 Reverse | 2.207 to 13.221 MPH Gears |
| Clutch | Spring-loaded, single-plate | 9-inch Diameter Friction Disc |
| Electrical | Generator & Starter System | 6V System, 5000 RPM Starter |
| Fuel System | Zenith or Marvel-Schebler Carburetor | Updraft, Single-Venturi Type |
Technical content addresses engine specifications, transmission and differential assemblies, electrical systems including generator and starter motor, fuel system components such as carburetors and fuel tanks, and detailed dimensional drawings of various tractor models. It also covers attachments and special features relevant to the Farmall and U-2 power units.
Torque specifications are documented for engine components, including main bearing caps and connecting rods, to ensure proper bearing preload accuracy.
Parts identification is covered for major assemblies, including engine components, transmission gears, and electrical units.
Removal procedures are documented for critical components such as the engine, transmission, differential, and electrical parts.
Technical specifications are provided for engine parameters like bore, stroke, valve clearances, and ignition timing.
Factory specifications are documented for parts like carburetor jets, generator output, and starter motor performance.
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