This is the factory Mitsubishi service manual for the 4G33, 4G52, and 4G54 forklift engines, covering the FG10, FGC10, FG14, FG15, FGC15, FG20, FGC20, FG25, FGC25, FG30, and FGC30 trucks. It runs 213 pages of engine repair procedures with a text layer for searching.
You get full teardown and rebuild coverage: cylinder head and block service, lubrication, fuel and cooling systems, electrical equipment, plus a troubleshooting section and service data with torque values and clearances. Specifications are broken out per engine, so you can find the right displacement, compression ratio, and output for your 4G33, 4G52, or 4G54.
Independent mechanics and owners restoring older Mitsubishi lift trucks can use it to diagnose hard starting, chase down power loss, and carry out top-end work with the exact factory numbers instead of guessing.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 4-10 | Engine Models, Performance Curves, Sectional Views, Specifications, Serial Number Location |
| Engine Proper | 11-42 | Cylinder Head Assembly, Removal and Disassembly (4G33 / 4G52 / 4G54), Reassembly and Installation, Cylinder Block Assembly, Crankcase Ventilation |
| Lubrication System | 43-47 | Engine Oil, Oil Filter, Oil Pump (4G33 / 4G52 / 4G54), Oil Pressure Switch |
| Fuel System | 48-57 | Fuel Pump, Construction and Function, Removal and Installation, Performance Test, Carburetor, Air Governor |
| Cooling System | 58-62 | Antifreeze Solution, Water Pump (4G33 / 4G52 / 4G54), Thermostat |
| Electrical Equipment | 63-81 | Starting Motor (Dry Clutch / Front Wet Clutch), Distributor, Ignition Coil, Spark Plugs, Alternator, Regulator, Battery |
| Special Service Tools | 82-85 | Engine, Lubrication System, Cooling System |
| Service Data | 86-101 | Maintenance Schedule, Maintenance Standards, Tightening Torque, Important Bolts and Nuts, General Bolts, Tapered Threads, Recommended Sealants |
| Troubleshooting | 102-114 | General Troubleshooting, Engine Proper Troubleshooting, Carburetor Troubleshooting, Electrical Equipment Troubleshooting |
| Appendix, Inspection Guide (Part 1) | 115-140 | Basic Mechanical Troubles, Troubleshooting and Analysis |
| Appendix, Inspection Guide (Part 2) | 141-213 | Cylinder Head and Valve Mechanism, Cylinder Sleeves, Pistons and Connecting Rods, Flywheel and Timing Gears, Crankcase and Major Running Parts, Lubrication System, Cooling System, Fuel System, Electrical System, Overhaul Guide |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 4G52, 4G54 | ||
| Cylinder head bolts torque (cold) (4G52, 4G54) | 9 ~ 10 kg-m (65 ~ 72 lb-ft) | p. 100 |
| Cylinder head bolts torque (hot) (4G52, 4G54) | 10 ~ 11 kg-m (72 ~ 80 lb-ft) | p. 100 |
| Distributor point gap (4G52, 4G54) | 0.45 ~ 0.55 mm (0.0177 ~ 0.0217 in.) | p. 74 |
| All Models | ||
| Rocker cover bolts torque | 0.5 ~ 0.7 kg-m (3.6 ~ 5.1 lb-ft) | p. 100 |
| Spark plugs torque | 2 ~ 3 kg-m (15 ~ 22 lb-ft) | p. 100 |
| Gasketed surface warpage (max) | 0.05 mm (0.0020 in.) | p. 90 |
| Intake and exhaust manifold attaching bolts torque | 1.5 ~ 2 kg-m (10.8 ~ 14 lb-ft) | p. 100 |
| 4G33 | ||
| Cylinder head bolts torque (cold), 4G33 | 7 ~ 8 kg-m (51 ~ 58 lb-ft) | p. 100 |
| Cylinder head bolts torque (hot), 4G33 | 8 ~ 9 kg-m (58 ~ 65 lb-ft) | p. 100 |
| Distributor point gap, 4G33 | 0.5 ± 0.05 mm (0.020 ± 0.0020 in.) | p. 74 |
| 4G33-32FD | ||
| Engine Displacement (Nominal), 4G33-32FD | 1450 cc | p. 6 |
| 4G52-33FD | ||
| Engine Displacement (Nominal), 4G52-33FD | 2000 cc | p. 6 |
