A 6D14 on the stand with the head off raises one question first: what goes back, and to what figure. The Mitsubishi 6D14 shop manual PDF (OEM 97821-02030) answers it across 490 pages, covering six variants of the 6D14, 6D15 and 6D16 diesel engine family, naturally aspirated and turbocharged. Electrical work fills nearly a third of the book, with wiring diagrams tracing the alternator, starter and automatic stop circuits, while the engine chapter walks you through cylinder head and valve mechanism, pistons, connecting rods, liners and camshaft. Injection pump and nozzle service, turbocharger, lubrication, cooling, clutch and air compressor each get their own chapters, and troubleshooting charts link a symptom to its cause. Check each glow plug for 3.8 Ω at normal temperature, and bring the M14 head bolts to 78 N·m before the final 180° turn. Angle-torque head bolts forgive nothing. Print the bookmarked, searchable file and let your reassembly pages take the oil stains on the bench.
What's Inside This Mitsubishi 6D14, 6D15 & 6D16 Series Manual
| System | Pages | Key Topics |
|---|---|---|
| How to Read This Manual | 6-13 | How This Manual Is Compiled, General Explanation of This Manual, Terms and Units |
| General | 14-27 | General Specifications, Engine Number and Name Plate, Precautions for Maintenance Operation, Table of Standard Tightening Torques |
| Engine | 28-107 | Structure and Operation, Troubleshooting, On-Vehicle Inspection and Adjustment, Cylinder Head and Valve Mechanism, Pistons, Connecting Rods, And Cylinder Liners, Camshaft |
| Lubrication | 108-137 | Lubrication System, Oil Pump and Oil Strainer, Oil Filter, Oil Cooler |
| Fuel and Engine Control | 138-191 | Injection Pump, Fuel System, Injection Nozzle |
| Cooling | 192-213 | Cooling System, Water Pump, Thermostat |
| Intake and Exhaust | 214-275 | Air Cleaner, Turbocharger, Intake Manifold, Exhaust Manifold |
| Clutch | 276-319 | Clutch Body, Bearing Case |
| Electrical System | 320-463 | Alternator, Starter, Automatic Stop System |
| Special Equipment | 464-490 | Air Compressor, Air Pressure Governor |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Cylinder head bolt (M14 bolt) | 78 N·m + 180° | p. 40 |
| Cylinder head bolt (M10 bolt) | 17 N·m + 34 N·m | p. 40 |
| Resistance of glow plug at normal temperature | 3.8 Ω | p. 450 |
| Oil filter drain valve torque (Upward-facing type) | 30 ± 4.9 N·m | p. 120 |
| Oil filter drain valve torque (Replaceable-element type) | 29 ± 4.9 N·m | p. 122 |
| Regulator valve opening pressure | 390 ± 29 kPa | p. 137 |
| Eyebolt (fuel feed hose, fuel return pipe) torque | Zexel 20 to 29 N·m {2 to 3 kgf·m}, Nippondenso 15 to 20 N·m {1.5 to 2 kgf·m} | p. 167 |
| Eyebolt torque (Injection pump drive) | 21 N·m {2.1 kgf·m} | p. 167 |
| Nut (drive gear mounting) torque | 167 to 211 N·m {17 to 21.5 kgf·m} | p. 167 |
| Pressure valve opening pressure | 69 ± 15 kPa {0.7 ± 0.15 kgf/cm²} | p. 201 |
| 6D14 | ||
| Injection nozzle hole diameter (6D14) | 0.28 mm | p. 139 |
| 6D14-T | ||
| Injection nozzle hole diameter (6D14-T) | 0.29 mm | p. 139 |
Mitsubishi 6D14, 6D15 & 6D16 Series Common Problems This Manual Covers
Mitsubishi 6D14, 6D15 and 6D16 diesel engine with low power output and abnormal engine noise
Check the low power output and abnormal engine noise causes before pulling anything. If the diagnosis puts the cylinder head on the bench, torque the M14 head bolts to 78 N·m plus a 180° turn and the M10 bolts to 17 N·m then 34 N·m per page 40.
Manual Section: Engine TroubleshootingEngine will not start or is difficult to start because of a defective fuel supply
Drain water from the water separator and open the fuel filter air vent plug to purge air. Then torque that plug to 9.8 ± 2.0 N·m per page 161. On the separator, tighten the air vent plug to 7.8 to 12 N·m and the drain plug to only 2.9 to 3.9 N·m, following page 164.
Manual Section: Fuel and Engine Control p. 161Injection nozzles suspected on an engine that knocks with unstable engine idling
Test nozzle injection pressure first. 1-spring holders should pop at 17.7 MPa per page 173. On 2-spring holders, check the 1st valve opening pressure at 16.67 MPa, the 2nd at 21.57 MPa, and prelift at 0.08 ± 0.02 mm on page 186. Adjust any nozzle outside those figures.
Manual Section: Injection Nozzle p. 173Thermostat suspected on a cooling system that shows engine overheating or overcooling
Remove the thermostat and verify the valve starts opening at 76.5 ± 2°C per page 212. Measure valve lift at 90°C against 10 mm or more, following page 211. Replace any thermostat that misses either figure, and refill using the 13 L engine main body coolant capacity on page 193.
Manual Section: Cooling p. 212Radiator and pressure valve suspected on an engine with excessive coolant loss
Test the pressure valve and replace it if the opening pressure falls outside 69 ± 15 kPa per page 201. Pressurize the radiator with 150 kPa of air and check for leakage. The spec is 0 cc, so correct or replace any radiator that leaks.
Manual Section: Cooling p. 201Glow plugs suspected when the engine cannot be preheated and is hard to start
Measure each glow plug's resistance at normal temperature against 3.8 Ω per page 450. Test them cold, not right after a preheat cycle. Replace any plug that reads open or off that figure, then work through the remaining Starter Troubleshooting items for an engine that cannot be preheated.
Manual Section: Electrical System p. 450Frequently Asked Questions
What is the torque specification for the cylinder head bolts on the Mitsubishi 6D1 series engines?
For the M14 cylinder head bolts, the tightening torque is 78 N·m (8 kgf·m) followed by an additional 180-degree turn. For the M10 bolts, the torque is 17 N·m (1.75 kgf·m) followed by an additional 34 N·m (3.5 kgf·m). p. 40
What are the replacement specifications for fuel injection nozzles on the Mitsubishi 6D14, 6D15 & 6D16 Series?
The injection pressure for the 1-spring type nozzle is 17.7 MPa (180 kgf/cm²). For the 2-spring type (Zexel), the 1st valve opening pressure is 16.7 MPa (170 kgf/cm²) and the 2nd valve opening pressure is 21.6 MPa (220 kgf/cm²). p. 172
What is the standard valve clearance for the Mitsubishi 6D1 series engines?
The standard valve clearance for the engine when cold is 0.4 mm. p. 37
What is the standard oil pan capacity for the Mitsubishi 6D14, 6D15 & 6D16 Series in general power applications?
The oil pan capacity for general power applications is approximately 9.5 liters. p. 109
What is the tightening torque for the crankshaft pulley mounting bolt on the Mitsubishi 6D14–6D16?
The standard tightening torque for the crankshaft pulley mounting bolt is 185 N·m (19 kgf·m). p. 100
How quickly can I access this Mitsubishi 6D14 manual after buying?
You get a 490-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Am I free to print this Mitsubishi 6D14 Shop Manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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