All 69 pages of this International Harvester Farmall H and 4 Series Service Manual zero in on the full family. Inside you get a full ignition section covering the magneto and impulse coupling, plus page after page of exploded views, torque tables, and step-by-step procedures for the engine, clutch, transmission, differential, bevel gears, steering gear, and PTO. Set your spark plug gap at .020–.025 inch using the 18 mm / 7/8-inch hex plug, then dial the governor to 1815 r.p.m. high idle — both numbers are pulled straight from the factory spec sheets. Old iron doesn't have to mean guesswork. Bookmarked and searchable; jump to any system in seconds and get the exact procedure you need before you pull a single bolt.
What's Inside This Farmall Farmall H and 4-Series Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction and Brief Descriptions | 8-17 | Introduction, Brief Descriptions, Serial Number Identification |
| Engine | 18-19 | Cylinder Head, Valves, Piston Assembly, Cylinder Sleeves, Connecting Rods, Crankshaft, Timing Gears |
| Ignition System | 20-21 | Magneto, Spark Plugs |
| Engine Lubrication System | 22-23 | Service |
| Electrical Equipment | 24-25 | Generator, Battery, Cutout Relay, Lighting Switch, Starting Motor, Flywheel Ring Gear |
| Cooling System | 26-28 | Heat Indicator, Thermostat, Water Pump, Radiator |
| Fuel System and Air Cleaner | 29-41 | Engine Governor, Manifold, Governor Control, Carburetor, Air Cleaner |
| Engine Clutch | 42-43 | Adjustment, Inspection |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Farmalls H & HV, W-4, 0-4, I-4, IU-4 | ||
| High idle speed (governor adjustment target) | 1815 r.p.m. | p. 15 |
| All Models | ||
| Magneto gear, number of teeth | 24 | p. 20 |
| Impulse coupling missing speed | 150 r.p.m. | p. 20 |
| Spark plug gap | .020 - .025 inches | p. 20 |
| Spark plug size | 18 mm. 7/8 in. hex. | p. 20 |
| Engine Oil Capacity | 6 quarts | p. 22 |
| Water Cooling System Capacity | 4 1/4 gallons | p. 26 |
| Cylinder Head Studs Torque | 70 ft.lb. | p. 15 |
| Brake Pedal Free Movement | 1-3/8 inches | p. 46 |
| Bevel Gear Backlash | .008 to .012-inch | p. 48 |
| Farmalls H, HV, W-4 | ||
| Clutch Pedal Free Movement | 1-1/8 inches | p. 42 |
Farmall Farmall H and 4-Series Common Problems This Manual Covers
Farmall H magneto stops producing spark suddenly, engine quits without warning p. 20
Remove the magneto and test the condenser and coil separately before assuming total magneto failure. Check all wire routing for internal grounding against the housing. Set spark plug gap to .020 to .025 inches with a feeler gauge. Verify impulse coupling engages below 150 r.p.m. during cranking. If timing is suspect, retime the magneto to the engine per the procedure on page 20.
Manual Section: Ignition SystemEngine hard to start, cranks fine but fires intermittently or not at all p. 20
Check spark plug gap first: set to .020 to .025 inches, 18 mm plugs with 7/8 in. hex. Inspect breaker points for dirt, pitting, or oil contamination. Verify magneto timing and confirm the impulse coupling trips cleanly below 150 r.p.m. If spark is weak, test the condenser and coil. Review the full hard starting checklist on page 33 covering compression, choke operation, fuel level, and jet cleanliness.
Manual Section: Ignition SystemTransmission pops out of gear under load, especially in upper gears p. 44
Inspect the shift linkage for wear, bent rods, and weak or broken shift springs. Worn detent springs are the most common cause of jump-out under load. Remove the transmission per page 44, then examine gear teeth for rounding or spalling on the affected gear pair. Replace worn springs and any gears showing tooth damage before reassembly. Check that the shift forks seat fully into gear before locking down linkage.
Manual Section: TransmissionEngine overheats, temperature climbs above normal operating range p. 26
Check coolant level first: system capacity is 4-1/4 gallons. Test the thermostat by suspending it in heated water and confirming it opens at the correct temperature per page 26. Inspect the radiator cap gasket for deterioration and the water pump packing for leaks. Check impeller shaft clearance and sleeve condition. Flush the system if scale or debris is present, then refill to the full 4-1/4 gallon capacity.
Manual Section: Cooling SystemClutch slips or drags, pedal feel wrong or no clean engagement p. 42
Measure clutch pedal free movement at the stop against the transmission cover: correct spec for Farmalls H, HV, and W-4 is 1-1/8 inches. If free movement is outside spec, adjust the operating rod per page 42. Inspect release levers for equal height and check pressure plate springs for set or breakage. A dragging clutch with correct free movement points to worn lining or warped pressure plate requiring removal and inspection.
Manual Section: Engine ClutchBrakes pull to one side or require excessive pedal travel to stop p. 46
Check brake pedal free movement: both pedals should measure 1-3/8 inches at the stop against the transmission cover. Adjust each brake independently per page 46, then equalize by road-testing and comparing stopping pull. Inspect brake lining for glazing or uneven wear. If one brake drags after release, check for a bent actuating rod or seized cam. Always equalize both sides after any individual adjustment.
Manual Section: Differential and BrakesFrequently Asked Questions
Torque specs for Farmall H cylinder head bolts?
The cylinder-head studs are 7/16-inch, and the nuts should be tightened with a torque tension wrench to 70 ft.lb. tension. The manual also lists the cylinder head torque in the Bolt Tension Data table as 70 ft.-lbs.
How to reset Farmall H hydraulic governor
The engine governor is of centrifugal type and can be adjusted. To adjust the high idle speed, turn screw (11) out to increase speed to rated r.p.m. or in to decrease speed. For low idle speed (450 r.p.m.), adjust the screw at the carburetor (Illust. 32) and then adjust the upper stop screw (10) on the governor control lever to touch its stop.
How do you fix farmall H magneto stops producing spark suddenly, engine quits without warning?
Remove the magneto and test the condenser and coil separately before assuming total magneto failure. Check all wire routing for internal grounding against the housing. Set spark plug gap to .020 to .025 inches with a feeler gauge. Verify impulse coupling engages below 150 r.p.m. during cranking. If timing is suspect, retime the magneto to the engine per the procedure on page 20.
How do you fix engine hard to start, cranks fine but fires intermittently or not at all?
Check spark plug gap first: set to .020 to .025 inches, 18 mm plugs with 7/8 in. hex. Inspect breaker points for dirt, pitting, or oil contamination. Verify magneto timing and confirm the impulse coupling trips cleanly below 150 r.p.m. If spark is weak, test the condenser and coil. Review the full hard starting checklist on page 33 covering compression, choke operation, fuel level, and jet cleanliness.
What do I get after purchasing this International Harvester Farmall H and 4 Series manual?
Instant PDF download. You get the full 69-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print this International Harvester Farmall H and 4 Series manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Can I find wiring schematics in this International Harvester Farmall H and 4 Series manual?
No. The manual does not contain any electrical wiring diagrams or schematics.
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