Main bearing clearance, valve lash, and injection pump timing for these small diesels all live in one book: the Mitsubishi L3E service manual PDF, factory publication 99619-15180, 147 pages covering six engine variants across the L2 and L3 lines. Wiring diagrams trace the starter, glow timer, and key-off stop circuits, while the rebuild chapters work from the rocker shaft down through the pistons, connecting rods, and crankshaft. Troubleshooting tables, performance curves, and a closing specifications chapter carry the tightening torque and sealant charts you will lean on during reassembly. Check oil pump discharge against 1.5 kgf/cm2 (0.15 MPa) at 1000 rpm, and set M10 bolts at 73.5 to 83.4 N·m, straight from the chart. One guessed torque figure can cost you a head gasket. Buy this once and it stays yours for as long as you run this engine, bookmarked by chapter and searchable down to the spec.
What's Inside This Mitsubishi L2–L3 Series Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 4-35 | Engine Model and Engine Number, Sectional Views, Features, Performance Curves, Engine Specifications, Maintenance, Troubleshooting |
| Engine | 36-73 | Rocker Arms and Rocker Shaft, Cylinder Head, Valves and Valve Springs, Gear Case and Oil Pump, Timing Gears, Camshafts, Piston and Connecting Rod, Crankshaft |
| Lubricating System | 74-77 | General, Oil Filter and Oil Pressure Switch |
| Fuel System | 78-87 | General, Fuel Injection Pump, Injection Nozzle |
| Governor System | 88-93 | General, Torque Spring, Governor |
| Cooling System | 94-101 | General, Fan and Fan Belt, Water Pump, Thermostat, Water Temperature Gauge Unit and Thermoswitch |
| Air Cleaner | 102-105 | Body Assembly, Element Assembly, Dust Pan Assembly, Partition Plate, Intake Hose |
| Electrical System | 106-131 | General, Starter, Alternator and Dynamo, Glow Plug, Key-Off Stop System, Glow Timer System |
| Service Specifications and Standards | 132-147 | Periodic Service Chart, Specifications and Standards, Tightening Torque Chart and Sealant Chart, Special Tools |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| M10 bolt tightening torque | 73.5 - 83.4 N·m | p. 14 |
| M8 bolt tightening torque | 19.6 - 29.4 N·m | p. 14 |
| Oil filter tightening torque | 9.8 - 12.7 N·m | p. 13 |
| Cartridge type fuel filter replacement interval | 400 hours | p. 16 |
| Oil pump discharge pressure at 1000 rpm | 1.5 kgf/cm² [0.15 MPa] | p. 52 |
| Oil pump discharge pressure at 2000 rpm | 2.0 kgf/cm² [0.20 MPa] | p. 52 |
| Oil filter relief valve opening pressure | 1.0 ± 0.2 kgf/cm² [0.1 ± 0.02 MPa] | p. 75 |
| Tightening torque for nozzle holder | 3.5 - 4.0 kgf·m [34 - 39 N·m] | p. 86 |
| Injection start pressure standard | 140 kgf/cm² [13.7 MPa] | p. 86 |
| Valve cracking temperature | 76.5°C ± 1.5°C | p. 138 |
| Full-opening temperature | 90°C | p. 95 |
| Thermoswitch Switch-ON temperature | 111°C ± 3°C | p. 95 |
Mitsubishi L2–L3 Series Common Problems This Manual Covers
Mitsubishi L3E cranks strong on the glow plugs but won't fire after sitting over the winter
Check the hard starting chart on page 29 and work it in order: preheat, fuel flow, timing, compression. Bleed the filter and injection pump until fuel runs free of bubbles. Test compression against the 29 to 32 kg/cm2 standard on page 27; low readings across all cylinders point to valve lash or ring wear, not fuel.
Manual Section: Hard starting p. 29Engine starts fine but falls flat under load, no black smoke, just weak pulling power
Verify fuel flow first: replace the cartridge fuel filter if it has more than 400 hours on it, then bleed the system. Pull the nozzles and pop test them; they should crack at 140 kgf/cm2 as specified on page 25. Reseat and torque the nozzle holders to 34 to 39 N·m per page 86 on reassembly.
Manual Section: Fuel System p. 78Runs hot within twenty minutes, coolant pushing out the overflow, gauge climbing under light load
Check fan belt tension first; deflection should be 10 mm under thumb pressure as shown on page 20. Pull the thermostat and test it in heating water; the standard unit cracks at 76.5°C per page 99 and must reach full open by 90°C. Replace it if lazy, then inspect the water pump weep hole for coolant seepage.
Manual Section: Cooling System p. 94Oil pressure light flickers at hot idle then stays on, no knock yet
Verify oil level and condition first. Test discharge pressure at the gallery: the pump should make 1.5 kgf/cm2 at 1000 rpm and 2.0 kgf/cm2 at 2000 rpm per page 52. Check the relief valve too; it should open at 3.0 kgf/cm2 as listed on page 75. Low readings with a healthy pump mean bearing clearance.
Manual Section: Lubricating System p. 74Rough lumpy idle with white smoke on cold start, smooths out once warm
Set valve clearance to 0.25 mm with the engine cold as specified on page 19; tight lash on one cylinder makes a lumpy idle and white smoke. Pop test each nozzle at 140 kgf/cm2 and match them within spec. Run a compression check afterward; even readings between cylinders matter more than the absolute number.
Manual Section: Unsteady idlingFrequently Asked Questions
What are the torque specifications for the cylinder head bolts on the Mitsubishi L-series engines?
For the M10 cylinder head bolts, the tightening torque is 7.5–8.5 kgf-m (73.5–83.4 N-m). For the M8 bolts, the tightening torque is 2.0–3.0 kgf-m (19.6–29.4 N-m). p. 19
What is the correct valve clearance for the intake and exhaust valves on a Mitsubishi L2–L3 Series diesel engine?
The valve clearance for both intake and exhaust valves is 0.25 mm when the engine is cold. p. 19
What is the oil capacity for the Mitsubishi L2 and L3 series diesel engines?
For L2 engines, the oil capacity is 2.4 liters (upper limit) and 1.4 liters (lower limit). For L3 engines, the ordinary type capacity is 3.0 liters (upper) and 1.5 liters (lower), while the deep type is 3.6 liters or 4.8 liters (upper) and 1.8 liters or 3.0 liters (lower). p. 18
What is the injection start pressure for the fuel injection nozzles on Mitsubishi L2–L3 Series diesel engines?
The injection start pressure for the nozzles is 140 kgf/cm² (13.7 MPa). p. 25
How often should the engine oil be changed?
The engine oil should be changed after the initial 50-hour operation of a new engine, and every 100 hours of operation thereafter. p. 17
How will I receive this Mitsubishi L2–L3 Series Service Manual?
One searchable PDF covering 147 pages, delivered instantly. No disc, no shipping, no waiting on the post.
Are there any print restrictions on this Mitsubishi L2–L3 Series manual?
Printing is allowed without restriction. Pull the pages you need for the job and bin them when they get greasy.
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