Base, T and TC versions of the 6D22 diesel engine fall within this 344-page Mitsubishi 6D22 shop manual PDF (OEM ID 97841-02002-00); its engine numbers and caution plate pages confirm which you have. Wiring diagrams sit in the engine electrical chapter beside the starter, alternator, safety relay, regulator, intake air heater and automatic stop device; troubleshooting charts and torque tables serve the engine chapters. Chapters then cover lubrication, fuel and engine control, cooling, intake and exhaust, clutch, and special equipment such as the air compressors and unloader valve assembly. Set inlet valve clearance at 0.4 mm. Cylinder head bolts tightened together with the bracket take 215 to 240 Nm (22 to 24.5 kgfm). Ordering a turbocharger? First check whether yours is the 3LM or TD08 type; each has its own section. Bookmarks and a searchable text layer surface clearances such as connecting rod end play (1.0 mm limit), so what you order matches the variant you confirmed.
What's Inside This Mitsubishi 6D22, 6D22-T, 6D22-TC Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 8-15 | External View (Photographs), Major Specifications (Engine Outputs Classified by Application), Engine Numbers and Caution Plate |
| Engine | 16-83 | Engine Proper, Service Standards, Special Tool, Service Procedures |
| Lubrication | 84-101 | Specifications and Service Standards, Service Procedures |
| Fuel and Engine Control | 102-201 | Special Tool, Service Procedures |
| Cooling | 202-217 | Water Pump, Thermostat, Radiator, Fan Drive, V-Belt Tension, Gas Leak Test |
| Intake and Exhaust | 218-243 | Air Cleaner, 3LM Type Turbocharger, TD08 Type Turbocharger, Intake Air Cooler |
| Engine Electrical | 244-303 | Starter, Alternator, Safety Relay, Regulator, Intake Air Heater, Automatic Stop Device |
| Clutch | 304-321 | Clutch Proper, Bearing Case, Service Standard Table, Troubleshooting |
| Special Equipment | 322-344 | Air Compressor, 1-Cylinder Air Compressor, 2-Cylinder Air Compressor, Unloader Valve Assembly |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Connecting rod end play | 0.2 to 0.5 mm (Nominal Value), 1.0 mm (Limit) | p. 6 |
| Piston projection | 0.87 to 1.33 mm (Nominal Value) | p. 6 |
| Inlet valve clearance | 0.4 mm | p. 7 |
| Cylinder head bolt torque (tightening together with bracket) | 215 to 240 Nm (22 to 24.5 kgfm) | p. 27 |
| Nozzle tube installation tightening torque | 15 Nm | p. 42 |
| Nozzle tube hydraulic test pressure | 195 kPa | p. 42 |
| Oil filter center bolt tightening torque | 59 to 69 Nm | p. 92 |
| Fuel filter connector bolt tightening torque | 34 Nm (3.5 kgfm) | p. 124 |
| Tension of V-belt (deflection) | 10 to 15 mm (w/fan drive), 17 to 22 mm (w/o fan drive) | p. 205 |
| Thermostat valve opening start temperature | 74.5 to 78.5°C | p. 205 |
| Thermostat valve lift/temperature | 10 mm or more at 90°C | p. 205 |
| Dust indicator operating resistance (Standard) | 7.47 ± 0.57 kPa (762 ± 58 mmH2O) | p. 225 |
Mitsubishi 6D22, 6D22-T, 6D22-TC Common Problems This Manual Covers
Mitsubishi 6D22 fuel system with air or water in the filters, engine cranks but is hard to start
Check for low fuel, then hunt for air: loose piping connections, a clogged feed pump gauze filter, a clogged fuel filter element, or air entering the feed pump, per page 197. Drain water from the injection pump, fuel filter, water separator and tank. Crank no more than 15 seconds at a time (page 159). If it still won't fire, adjust injection pump timing.
Manual Section: Fuel and Engine Control Troubleshooting p. 197Governor full load stopper or injection nozzles out of spec, excessive black smoke in exhaust gas
Check the governor full load stopper; if loose, adjust the full load stopper bolt per page 200. Verify injection pump timing. Remove the nozzles, clean carbon from around the nozzle holes, and test injection starting pressure: 21.6 to 22.5 MPa for the 1-spring nozzle (page 123), 17.7 MPa for the 2-spring nozzle (page 122). Check injection rate on a pump tester.
Manual Section: Fuel and Engine Control Troubleshooting p. 200Oil filter element, strainer or bearings worn or clogged, engine shows low oil pressure
Check oil level; if abnormal, verify whether oil is contaminating the coolant or leaking, repair, then refill, per page 100. Replace oil of wrong viscosity. Replace a clogged filter element and torque the center bolt to 59 to 69 Nm (page 92). Inspect the strainer, oil pump coupling, piping, relief and bypass valves, pump wear, and rod and main bearings.
Manual Section: Lubrication Troubleshooting p. 100Restricted air cleaner or muffler, poor turbocharger performance or low compression, engine lacks power
Check the air cleaner dust indicator, which operates at 7.47 ± 0.57 kPa on the standard unit (page 225). Clean the outer element, but never clean the inner element (page 228) or remove it while cleaning the outer (page 227). Inspect turbocharger performance and installation. Set inlet valve clearance cold to 0.4 mm (page 7) and verify injection timing. If power stays down, test compression for head gasket, ring or liner wear.
Manual Section: Engine Troubleshooting p. 79Valve clearance, rocker shaft or bearing wear, engine develops unusual noise from rocker cover or crankcase
Adjust valve clearance, inlet 0.4 mm cold (page 7), then check valve springs, rocker shaft and bracket, and timing gear backlash per page 81. For crankcase knock with little variation, inspect rod large end and main bearings and crankshaft end play (page 82). Torque rod nuts to 115 Nm and main bearing cap bolts to 370 Nm (page 27).
Manual Section: Engine Troubleshooting p. 81Injection pump mounting loose or pipes cracked, knocking sound near the injection pump
Check the injection pump mounting first; if loose, align the timing mark and tighten the bolts per page 200. Inspect injection pipes for cracks and the pump connector for looseness, then repair or replace. If the pump sounds off at low speed, the tappet area parts are worn: disassemble, inspect and have a DIESEL KIKI service shop check it. Never remove the pump bracket unless cracked (page 129).
Manual Section: Fuel and Engine Control Troubleshooting p. 200Frequently Asked Questions
What are the torque specifications for the Mitsubishi 6D22 cylinder-head bolts?
The cylinder head bolts for the 6D22 engine must be tightened to 215 to 275 Nm (22 to 28 kgfm). If tightening together with the bracket, the torque is 215 to 240 Nm (22 to 24.5 kgfm). p. 27
What are the connecting-rod and main-bearing torque specifications for a 6D22?
The connecting rod nut should be tightened to 115 Nm (12 kgfm) in a wet state. The main bearing cap bolt should be tightened to 370 Nm (38 kgfm) in a wet state. p. 27
What is the valve clearance adjustment procedure for a Mitsubishi 6D22?
The valve clearance for the 6D22 engine is 0.4 mm for the inlet and 0.6 mm for the exhaust when the engine is cold. Adjustment is performed by loosening the lock nut and using the adjusting screw, then rechecking the clearance after tightening the lock nut. p. 75
How do I set injection-pump timing on a 6D22-T or 6D22-TC?
Injection timing is set by aligning the fuel injection start timing angle scale on the flywheel with the pointer on the inspection window. If the timing is incorrect, loosen the two timing adjusting bolts and turn the automatic timer to adjust, then tighten the bolts to the specified torque. p. 160
What is the oil pan capacity for the Mitsubishi 6D22 engine?
The oil pan capacity for the 6D22 engine is approximately 27 liters for general power applications and approximately 25 liters for construction machinery applications. p. 91
How quickly can I access this Mitsubishi 6D22 manual after buying?
Immediate download of the complete 344-page searchable Shop Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print specific sections of this Mitsubishi 6D22 Shop Manual?
Yes. Print individual pages or full chapters for your own shop use, on letter or A4 paper.
