Chasing low oil pressure through an 8DC without the factory clearances usually ends in a spun bearing you could have caught on the stand. This Mitsubishi 8DC9 shop manual PDF, 352 pages under OEM number 97841-03001-00 NA, is the factory workshop text for the 8DC8, 8DC9, and turbocharged 8DC9-T V8 diesels, wherever yours is mounted. Service standards take up an early chapter of wear limits covering the engine proper, inlet and exhaust, lubrication, and cooling, and the fuel section carries injection pump and nozzle work through to the bench. Wiring diagrams trace the starter, alternator, safety relay, and intake air heater circuits, with a full chapter on the clutch and bearing case. Fit pistons at 0.17 to 0.19 mm liner clearance and scrap any main journal past 0.01 mm out of round. Every week it sits in pieces is a week of nothing. Bought once, this bookmarked PDF stays yours for every rebuild the engine has left.
What's Inside This Mitsubishi 8DC8, 8DC9, 8DC9-T, Model DC Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 9-78 | General Description, Specifications, Construction and Operation |
| Service Standards | 79-102 | Engine Adjustment Standards, Engine Proper Service Standards, Inlet and Exhaust Service Standards, Lubrication Service Standards, Cooling Service Standards |
| Special Tools | 103-110 | Engine Special Tools, Clutch and Bearing Case Special Tools |
| Determining Time to Overhaul, Engine Adjustment and Break-In Operation | 111-122 | Determining Time to Overhaul, Adjustment of Engine, Break-In Operation |
| Removal and Installation of Auxiliaries | 123-136 | Preparations, Removal and Installation |
| Engine Proper | 137-192 | Disassembly, Inspection and Correction, Reassembly |
| Inlet and Exhaust | 193-204 | Inlet Manifold, Exhaust Manifold, Air Cleaner, Turbocharger |
| Lubrication | 205-212 | Oil Pump, Relief Valve, Oil Filter, Oil Cooler |
| Cooling | 213-222 | Water Pump, Thermostat, Fan Drive and Tension Pulley, Radiator |
| Fuel | 223-294 | Injection Pump General, Injection Nozzle, Fuel Filter |
| Electrical | 295-322 | Starter, Alternator, Safety Relay, Regulator, Intake Air Heater |
| Other Equipment | 323-340 | Air Compressor, Injection Pump Drive, Automatic Stop System |
| Clutch | 341-352 | Clutch Proper, Bearing Case, Adjustment After Installation |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Oil clearance | 0.06 to 0.12 mm | p. 84 |
| Clearance between piston and cylinder liner | 0.17 to 0.19 mm | p. 83 |
| Clearance between piston pin and connecting rod | 0.01 to 0.05 mm | p. 84 |
| Crankshaft roundness limit | 0.01 mm or less | p. 84 |
| Unit seal installation load | 39 to 59 N (4 to 6 kgf) | p. 213 |
| Radiator cap valve opening pressure | 34 to 63 kPa (0.35 to 0.65 kgf/cm²) | p. 217 |
| Radiator leak test pressure | 98 kPa (1 kgf/cm²) | p. 217 |
| Air tightness test | 0 cc/minute | p. 287 |
| Delivery rate test (KE type) | 300 cc/15 secs | p. 287 |
| Valve Clearance (Inlet, Cold) | 0.4 mm | p. 80 |
| Valve Clearance (Exhaust, Cold) | 0.6 mm | p. 80 |
| Oil Pressure (At Idling, Standard) | 150 kPa | p. 80 |
Mitsubishi 8DC8, 8DC9, 8DC9-T, Model DC Common Problems This Manual Covers
Mitsubishi 8DC8 hard starting, cranks strong but no fuel reaching the injection pump
Test the lift pump before condemning the injection pump. Run a delivery rate test against the table on page 287; a K type pump should move 600 cc in 15 seconds, a KE type 300 cc. Check air tightness at 196 kPa; any leakage past 0 cc per minute fails the pump.
Manual Section: Fuel p. 287Diesel seeping around injector bodies, white smoke and rough idle once the engine warms up
Pull each nozzle and pop test it; opening pressure should hit 21.6 MPa, the figure listed on page 21. Watch for dribble or a wet tip after the spray cuts off. If fuel is seeping around the nozzle body in the head, replace the injector sleeves and seals rather than reusing them.
Manual Section: Fuel p. 223Runs hot under load and loses coolant, no puddle under the engine
Test the radiator cap first; the valve should hold 34 to 63 kPa before it opens, per page 217. Pressure test the radiator at 98 kPa through the filler port and watch for seepage. If both check out, pull the water pump and inspect the unit seal; press a new seal in at 39 to 59 N installed load.
Manual Section: Cooling p. 217Oil pressure gauge sagging at hot idle, dull knock from the bottom end
Verify pressure with a mechanical gauge at operating temperature; standard is 150 kPa at idle and 295 to 490 kPa at maximum speed, per page 80. Check the relief valve and filter before pulling the pan. If pressure stays low, plastigauge the main bearings; oil clearance past 0.06 to 0.12 mm on page 84 calls for new bearings.
Manual Section: Lubrication p. 205Turbocharged engine down on power with white exhaust smoke and whistle under boost
Work the turbocharger chart on page 199; it covers output loss, abnormal noise, and white smoke in one table. Check the air cleaner and intake piping for restriction before blaming the turbo. If the boost side is clean, pop test the nozzles; opening pressure should read 21.6 MPa, and a weak nozzle will smoke and cost power.
Manual Section: Turbocharger Troubleshooting p. 199Loud tappet clatter at idle and rough running long after the last valve adjustment
Set valve lash with the engine cold: 0.4 mm inlet and 0.6 mm exhaust, straight from the standards table on page 80. Follow the adjustment procedure in the engine adjustment section starting on page 111 and work the firing order so each rocker sits on the base circle. Recheck after the first warm run.
Manual Section: Determining Time to Overhaul, Engine Adjustment and Break-In Operation p. 111Frequently Asked Questions
What is the torque specification for the cylinder head bolts on the Mitsubishi 8DC8 engine?
The cylinder head bolts for the 8DC8 engine have different torque specifications based on the bolt size. For M14 x 2.0 bolts, the torque is 175 Nm (18 kgf m), and for M16 x 2.0 bolts, the torque is 285 Nm (29 kgf m). Both specifications are for wet threads. p. 96
What is the standard valve clearance for the Mitsubishi 8DC8, 8DC9, and 8DC9-T engines?
The standard valve clearance for these engines when cold is 0.4 mm for the inlet valves and 0.6 mm for the exhaust valves. p. 80
What is the standard compression pressure at 200 rpm for the Mitsubishi 8DC8, 8DC9, 8DC9-T, Model DC diesel engine?
The nominal compression pressure for the engine at 200 rpm is 2750 kPa (28 kgf/cm²). The repair limit is 1960 kPa (20 kgf/cm²) or less. p. 80
What is the standard V-belt tension for the engine?
The standard V-belt tension, measured as deflection when the fan belt is pressed down at the center under approximately 98 N (10 kgf) pressure, is 10 to 15 mm. For the 8DC9-T fan drive only, it is 7 to 10 mm. p. 80
How quickly can I access this manual after buying?
Instant PDF download. You get the full 352-page scanned Shop Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Am I able to print pages from this manual?
You can. The PDF is unlocked and carries no copy protection, so print the sections you want and keep the file as your backup.
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