Factory specs for the Mitsubishi 4G33, 4G52, and 4G54 gasoline engines run across 213 pages, covering FG10, FGC10, FG14, FG15, FGC15, FG20, FGC20, FG25, FGC25, FG30, and FGC30 lift trucks. Wiring diagrams cover the complete electrical system. Dedicated sections walk through the cylinder head, cylinder block, carburetor, fuel pump, and starting motor. Troubleshooting charts cover engine, carburetor, and electrical faults, backed by full specifications and maintenance standards plus exploded views of every major assembly. Head-bolt torque specs are included: the 4G52 and 4G54 call for 9~10 kg-m (65~72 lb-ft) cold, while the 4G33 cold specification is 7~8 kg-m (51~58 lb-ft), both on page 100. Bookmarks and full-text search get you to the right page without hunting.
What's Inside This Mitsubishi 4G33, 4G52, 4G54 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) | 9 ~ 10 kg-m (65 ~ 72 lb-ft) | p. 100 |
| Cylinder head bolts torque (hot) | 10 ~ 11 kg-m (72 ~ 80 lb-ft) | p. 100 |
| Distributor point gap | 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) | 7 ~ 8 kg-m (51 ~ 58 lb-ft) | p. 100 |
| Cylinder head bolts torque (hot) | 8 ~ 9 kg-m (58 ~ 65 lb-ft) | p. 100 |
| Distributor point gap | 0.5 ± 0.05 mm (0.020 ± 0.0020 in.) | p. 74 |
| 4G33-32FD | ||
| Engine Displacement (Nominal) | 1450 cc | p. 6 |
| 4G52-33FD | ||
| Engine Displacement (Nominal) | 2000 cc | p. 6 |
Mitsubishi 4G33, 4G52, 4G54 Common Problems This Manual Covers
Mitsubishi 4G33 engine cranks but will not start or idles erratically when cold p. 74
Inspect the distributor and ignition system. Measure the distributor point gap to verify it is 0.5 ± 0.05 mm (0.020 ± 0.0020 in.) as specified on page 74. Set the dwell angle per the service data table and check spark plug condition before attempting a restart.
Manual Section: Electrical Equipment TroubleshootingOverheating under heavy load accompanied by coolant loss and a dull heavy metallic knock p. 100
Remove the cylinder head and inspect the gasketed surface for warpage exceeding 0.05 mm. When reinstalling the head on the 4G52 or 4G54, torque the cold cylinder head bolts to 9~10 kg-m (65~72 lb-ft) following the sequence on page 100 for an even seal.
Manual Section: Engine Proper TroubleshootingExcessive exhaust smoke and high oil consumption combined with a noticeable lack of power and poor acceleration p. 90
Test cylinder compression to evaluate piston ring and valve seal condition. Verify the 4G33 engine meets the compression pressure specified on page 90. Drain the crankcase and refill with the oil quantity specified in the Service Data section before rechecking baseline consumption rates.
Manual Section: Gasoline Engine Troubleshooting GuidePersistent engine misfire and loss of power during routine operation on older high-hour machines p. 89
Drain the crankcase and follow the engine oil change interval found on page 89. Remove the valve cover and adjust the intake valve clearance to the hot specification in the Service Data section. Inspect the carburetor linkages and clean all primary fuel delivery passages.
Manual Section: General TroubleshootingFrequently Asked Questions
How to reset the distributor timing on a Mitsubishi 4G52/4G54?
Set the distributor point gap correctly first. Then connect a timing light lead to the No. 1 spark plug and check the timing mark on the crankshaft pulley with the engine running. Turn the distributor one way or the other until the timing mark aligns. These steps apply to both the 4G52 and the 4G54.
How to reset the ignition timing after replacing the head gasket on a Mitsubishi 4G52?
A head gasket replacement requires resetting the ignition timing afterward. Start with the distributor point gap, then connect a timing light to the No. 1 spark plug and watch the timing mark on the crankshaft pulley with the engine running. Rotate the distributor until the mark sits at the correct position.
What are the torque specs for the cylinder head on a Mitsubishi 4G52 or 4G54?
On the 4G52 and 4G54, torque the cylinder head bolts to 9~10 kg-m (65~72 lb-ft) cold and 10~11 kg-m (72~80 lb-ft) hot. Using both figures ensures the head seats evenly.
What do I get after purchasing this Mitsubishi 4G33, 4G52, 4G54 manual?
A 213-page Service Manual in searchable PDF, ready to download the moment checkout completes. Open it on a computer, tablet, or phone, with no shipping wait.
Can I print this manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Are there wiring harness diagrams in this Mitsubishi 4G33, 4G52, 4G54 manual?
Included. The Mitsubishi 4G33, 4G52, 4G54 Service Manual covers complete wiring harness diagrams, electrical circuits, and connector pinouts.
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