All 99 pages of this International Harvester V-304, V-345, and V-392 Service Manual (OEM #GSS-1402) target one job: rebuilding and diagnosing these gasoline and LPG V-engines as they ran in the 815 and 915 Combine. Inside you get full electrical wiring diagrams covering the distributor, alternator, AC regulator, and cranking motor, plus page after page of exploded views across the engine, carburetor, and LPG fuel system. System diagrams walk you through the lubrication circuit, timing gear train, and governor; a dedicated troubleshooting section covers both fuel systems back-to-back. Set carburetor float height to 7/32 inches and confirm distributor dwell at 27-33° before you button anything up. Your engine is apart and the factory answer is 99 pages away. Bookmarked and keyword-searchable: jump straight to the spec you need and get the combine back in the field.
What's Inside This International Harvester V-304, V-345, V-392 Manual
| System | Pages | Key Topics |
|---|---|---|
| Special Service Tools Required | 5-6 | Camshaft Bearing Service Kit, Piston Fitting Set, Water Pump Seal Installer, Camshaft Remover and Installer, Carburetor Bushing Remover, Float Level Gauge |
| Standard Torque Data for Nuts and Bolts | 7 | Recommended Torque, Torque Values, Bolt Diameter, Bolt Type Identification, Bolt Head Marking, S.A.E. Grade |
| Engine | 8-47 | Engine Lubrication System, Cylinder Heads and Valves, Connecting Rods, Pistons and Piston Rings, Oil Pump, Timing Gear Train and Front Cover, Engine Governor |
| Gasoline Fuel System | 48-61 | Carburetor Specifications, Zenith Carburetors, Fuel Supply System, Throttle Shaft Bushings, Float Assembly, Electric Fuel Pump |
| Lpg Fuel System | 62-89 | Lp Carburetor Specifications, Fuel Tank and Fittings, Fuelock-Strainer Assembly, Regulator Service, Trouble Shooting, Carburetor Service |
| Electrical | 90-95 | Distributor, Battery, Alternator, AC Regulator, Cranking Motor, Cranking Motor Switch |
| Service Bulletin Record | 96-99 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Carburetor Float Height | 7/32 inches | p. 49 |
| Battery Fully Charged Specific Gravity | 1.255 - 1.270 @ 80°F | p. 91 |
| Distributor Dwell Angle | 27-33° | p. 91 |
| Distributor Breaker Point Gap | .014-.018 inches | p. 91 |
International Harvester V-304, V-345, V-392 Common Problems This Manual Covers
International Harvester V-304/V-345/V-392 valve train clatter and power loss from worn non-adjustable rocker arms p. 13
Remove the valve covers and check rocker arm-to-valve stem clearance on all cylinders. Stock rocker arms on these engines are non-adjustable and wear the shaft bores oval over time. Replace with rebushed, roller-tipped adjustable rocker arms. Torque rocker shaft pedestals per the spec table on page 13. Recheck valve lash after seating and verify smooth rotation through full RPM range.
Manual Section: EngineOil squirting from fuel pump breather hole under load, soaking engine bay
Stop the engine immediately and depressurize the fuel system. Pull the fuel pump and inspect the internal diaphragm and breather seal for rupture or hardening. A failed diaphragm allows crankcase pressure to push oil through the breather port. Replace the diaphragm and breather seal as a set. Reinstall and run at load for 10 minutes, then recheck the breather for any seepage.
Manual Section: Gasoline Fuel SystemEngine starves or stumbles at speed, carburetor float flooding or running lean p. 49
Remove the carburetor float bowl and measure float height: set to exactly 7/32 inches as specified on page 49. Inspect the needle valve and seat for wear or debris. Check the throttle shaft bushings for slop — worn bushings let unmetered air in and kill fuel mixture control. Refer to pages 54-57 for casting inspection and mating surface checks before reassembly.
Manual Section: Gasoline Fuel SystemEngine misfires and loses power at high torque, V-392 camshaft suspected worn lobes p. 10
Pull the valve covers and watch each rocker for lift consistency while cranking. Uneven or shallow lift on one or more cylinders points to worn cam lobes. To confirm, remove the camshaft per the procedure in the Engine section and mic each lobe against the clearance specs on page 10. Use the Camshaft Remover and Installer listed on page 5 to avoid bending the shaft on extraction.
Manual Section: EngineLPG engine won't develop full power, regulator output pressure suspect p. 81
Connect a calibrated gauge to the secondary outlet port and test regulator output pressure against the spec range on page 81. If pressure is off, disassemble the regulator per pages 77-83: inspect the high-pressure diaphragm for cracks, check the hi-pressure valve seat for pitting, and verify the low-pressure valve lever moves freely without binding. Replace any cracked or hardened diaphragm before reassembly and re-test output.
Manual Section: Lpg Fuel SystemEngine cranks slowly or won't start in cold weather, electrical system weak p. 91
Test battery specific gravity: a fully charged battery reads 1.255 to 1.270 at 80°F per page 91. Below 1.220 in any cell means the battery won't deliver enough cold-cranking amperage. Also check distributor breaker point gap at .014 to .018 inches and verify dwell angle falls between 27 and 33 degrees. Tight points or a weak battery together kill cold-start performance fast.
Manual Section: ElectricalFrequently Asked Questions
What are the torque specs for International Harvester V-304, V-345, V-392 engine bolts?
The service manual provides specific torque values for various engine bolts. For Cylinder Head Bolts, the torque is 95 Ft. Lbs. Main Bearing Cap Bolts require 80 Ft. Lbs., and Connecting Rod Bolts should be torqued to 50 Ft. Lbs. These values are based on threads lubricated with engine oil.
How do you fix international Harvester V-304/V-345/V-392 valve train clatter and power loss from worn non-adjustable rocker arms?
Remove the valve covers and check rocker arm-to-valve stem clearance on all cylinders. Stock rocker arms on these engines are non-adjustable and wear the shaft bores oval over time. Replace with rebushed, roller-tipped adjustable rocker arms. Torque rocker shaft pedestals per the spec table on page 13. Recheck valve lash after seating and verify smooth rotation through full RPM range.
How do you fix oil squirting from fuel pump breather hole under load, soaking engine bay?
Stop the engine immediately and depressurize the fuel system. Pull the fuel pump and inspect the internal diaphragm and breather seal for rupture or hardening. A failed diaphragm allows crankcase pressure to push oil through the breather port. Replace the diaphragm and breather seal as a set. Reinstall and run at load for 10 minutes, then recheck the breather for any seepage.
How do you fix engine starves or stumbles at speed, carburetor float flooding or running lean?
Remove the carburetor float bowl and measure float height: set to exactly 7/32 inches as specified on page 49. Inspect the needle valve and seat for wear or debris. Check the throttle shaft bushings for slop — worn bushings let unmetered air in and kill fuel mixture control. Refer to pages 54-57 for casting inspection and mating surface checks before reassembly.
How will I receive this manual?
A 99-page Service Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Is this International Harvester V-304, V-345, V-392 Service Manual printable?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Does this International Harvester V-304, V-345, V-392 manual have electrical?
Yes. You'll find full electrical schematics with wire routing diagrams, connector identification, and circuit descriptions.
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