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Mitsubishi L3C Engine

General Technical Data

Engine Specifications

Engine Model ............... Mitsubishi L3C
Engine Type ............... 4-cycle inline 3-cylinder swirl chamber liquid-cooled diesel
Number of Cylinders ............... 3
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 2.76 (70.0)
Engine Stroke, in (mm) ............... 2.76 (70.0)
Displacement, cu.in (L) ............... 49.3 (0.808)
Rated Engine Power, hp (kW) ............... 15.0-15.8 (11.2-11.8)
Rated Engine Speed, rpm ............... 2500-3000
Peak Torque ............... 36.9-39.8 lb-ft (50.0-54.0 Nm) at 1900-2100 rpm
Idle Speed ............... 800-900 rpm
Aspiration Type ............... Naturally Aspirated
Operating Speed ............... 2700 rpm
Compression Ratio ............... 23.0:1
Firing Order ............... 1-3-2
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron
Lubrication System ............... Full-pressure forced circulation
Oil Pump Type ............... Gear-driven trochoid pump
Oil Filter Type ............... Full-flow, spin-on cartridge
Cooling System ............... Liquid-cooled forced circulation
Water Pump Type ............... Belt-driven centrifugal pump
Air Cleaner Type ............... Dry dual-element
Starting System ............... Electric Starter
Electrical System ............... 12V
Alternator Output ............... 40A

Fuel System

Injection Pump Type ............... Bosch style in-line pump
Governor Type ............... Centrifugal mechanical weight
Injection Nozzle Type ............... Throttle type nozzle
Injection Start Pressure, psi (MPa) ............... 1991 (13.73)
Fuel Injection Timing ............... 16-18 degrees BTDC
Fuel Filter Type ............... Spin-on element with water sedimenter
Fuel Transfer Pump Type ............... Mechanical diaphragm or electric plunger
Fuel Type ............... Diesel Fuel Oil ASTM No. 2-D
Feed Pump Pressure, psi (bar) ............... 2.9-4.3 (0.2-0.3)
Nozzle Holder Gasket Thickness, in (mm) ............... 0.039 (1.0)
Combustion Chamber Type ............... Swirl chamber type spherical
Glow Plug Type ............... Sheathed filament quick heating
Glow Plug Voltage, V ............... 12V
Max Fuel Return Line Leakage, qt/min (L/min) ............... 0.010 (0.010)
Fuel Line Diameter, in (mm) ............... 0.197 (5.0)

Dimensions and Weight

Engine Length, in (mm) ............... 20.7 (525)
Engine Width, in (mm) ............... 16.5 (420)
Engine Height, in (mm) ............... 20.9 (530)
Dry Weight, lbs (kg) ............... 165 (75)

Maintenance Data

Service Information

Compression Pressure, Standard, psi (MPa) ............... 427 (2.94)
Compression Pressure, Limit, psi (MPa) ............... 370 (2.55)
Maximum Inter-Cylinder Pressure Variance, psi (MPa) ............... 35.6 (0.246)
Oil Pressure at Low Idle, psi (bar) ............... 7.1 (0.49)
Oil Pressure at Rated Speed, psi (bar) ............... 28.4-56.9 (1.96-3.92)
Maximum Coolant Temperature, F (C) ............... 212 (100)
Maximum Lubricating Oil Temperature, F (C) ............... 248 (120)
Thermostat Opening Temperature, F (C) ............... 160 (71)
Thermostat Full Open Temperature, F (C) ............... 185 (85)
Fan Belt Tension Deflection, in (mm) ............... 0.39-0.47 (10.0-12.0)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 15W-40
API Service Classifications ......................... CD, CE, or CF
Engine Oil Capacity (Std Pan), gal (L) ............... 0.81 (3.08)
Engine Oil Capacity (Deep Pan), gal (L) ............... 0.96 (3.62)
Engine Coolant Capacity, qt (L) ............... 2.43 (2.3)

Service Intervals

Change engine oil ............... Every 200 hours
Replace oil filter ............... Every 200 hours
Replace fuel filter ............... Every 400 hours
Service air filter ............... Every 100 hours
Replace air filter ............... Every 1000 hours
Change coolant ............... Every 1000 hours
Valve-lash adjustment ............... Every 400 hours
Check fuel system ............... Every 400 hours
Compression test ............... Every 800 hours
Clean radiator fin ............... Every 100 hours
Belt inspection ............... Every 100 hours

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ............... 2.7559-2.7567 (70.000-70.020)
Cylinder Bore Taper Ovality, in (mm) ............... 0.0004 (0.010)
Connecting Rod Small End Bushing I.D Standard, in (mm) ............... 0.8272-0.8280 (21.010-21.030)
Crankpin Journal Outside Diameter, in (mm) ............... 1.5744-1.5752 (39.990-40.010)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0012-0.0028 (0.030-0.070)
Crankshaft Main Journal Diameter, in (mm) ............... 1.6925-1.6933 (42.990-43.010)
Main Bearing Oil Clearance, in (mm) ............... 0.0012-0.0028 (0.030-0.070)
Crankshaft End Play, in (mm) ............... 0.0020-0.0098 (0.050-0.250)
Piston Skirt Outside Diameter, in (mm) ............... 2.7539-2.7547 (69.950-69.970)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0012-0.0028 (0.030-0.070)
Piston Pin Bore Inside Diameter, in (mm) ............... 0.8268-0.8272 (21.000-21.010)
Piston Pin Outside Diameter, in (mm) ............... 0.8266-0.8268 (20.995-21.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0000-0.0006 (0.000-0.015)
Top Ring Groove Width, in (mm) ............... 0.0787-0.0795 (2.000-2.020)
Second Ring Groove Width, in (mm) ............... 0.0787-0.0795 (2.000-2.020)
Oil Ring Groove Width, in (mm) ............... 0.1575-0.1583 (4.000-4.020)
Top Ring Side Clearance, in (mm) ............... 0.0024-0.0039 (0.060-0.100)
Second Ring Side Clearance, in (mm) ............... 0.0020-0.0035 (0.050-0.090)
Oil Ring Side Clearance, in (mm) ............... 0.0012-0.0028 (0.030-0.070)
Top Ring End Gap, in (mm) ............... 0.0059-0.0118 (0.150-0.300)
Second Ring End Gap, in (mm) ............... 0.0059-0.0118 (0.150-0.300)
Oil Ring End Gap, in (mm) ............... 0.0079-0.0157 (0.200-0.400)
Cylinder Head Distortion Face, in (mm) ............... 0.0020 (0.050)
Cylinder Head Gasket Thickness, in (mm) ............... 0.0472 (1.200)
Inlet Valve Stem Outside Diameter, in (mm) ............... 0.2583-0.2591 (6.560-6.580)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 0.2571-0.2579 (6.530-6.550)
Valve Guide Inside Diameter Standard, in (mm) ............... 0.2598-0.2606 (6.600-6.620)
Inlet Valve Stem to Guide Clearance, in (mm) ............... 0.0008-0.0024 (0.020-0.060)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0020-0.0035 (0.050-0.090)
Inlet Valve Sinkage, in (mm) ............... 0.0276-0.0394 (0.700-1.000)
Exhaust Valve Sinkage, in (mm) ............... 0.0276-0.0394 (0.700-1.000)
Valve Face Angle, deg ............... 45 degrees
Valve Seat Angle, deg ............... 45 degrees
Valve Spring Free Length, in (mm) ............... 1.4646 (37.200)
Camshaft Journal Diameter (Front), in (mm) ............... 1.2980-1.2988 (32.970-32.990)
Camshaft Journal Diameter (Center), in (mm) ............... 1.2587-1.2594 (31.970-31.990)
Camshaft Journal Diameter (Rear), in (mm) ............... 1.2193-1.2201 (30.970-30.990)
Camshaft Bearing Oil Clearance, in (mm) ............... 0.0012-0.0035 (0.030-0.090)
Cam Height (Inlet), in (mm) ............... 1.2890-1.2898 (32.740-32.760)
Cam Height (Exhaust), in (mm) ............... 1.2890-1.2898 (32.740-32.760)
Rocker Arm Shaft Outside Diameter, in (mm) ............... 0.4689-0.4697 (11.910-11.930)
Rocker Arm Bushing Inside Diameter, in (mm) ............... 0.4705-0.4717 (11.950-11.980)
Rocker Arm Bushing to Shaft Clearance, in (mm) ............... 0.0008-0.0028 (0.020-0.070)
Tappet Outside Diameter, in (mm) ............... 0.7067-0.7075 (17.950-17.970)
Tappet Guide Bore Inside Diameter, in (mm) ............... 0.7087-0.7094 (18.000-18.020)
Tappet to Guide Bore Clearance, in (mm) ............... 0.0012-0.0028 (0.030-0.070)
Idler Gear Shaft Outside Diameter, in (mm) ............... 1.3366-1.3374 (33.950-33.970)
Idler Gear Bushing Inside Diameter, in (mm) ............... 1.3386-1.3396 (34.000-34.025)
Idler Gear Bushing to Shaft Clearance, in (mm) ............... 0.0012-0.0030 (0.030-0.075)

Tightening Torques

Cylinder Head M10 Bolts, lb-ft (Nm) ............... 54.3-61.5 (73.5-83.4)
Cylinder Head M8 Bolts, lb-ft (Nm) ............... 14.5-21.7 (19.6-29.4)
Main Bearing Cap Bolts, lb-ft (Nm) ............... 36.2-39.8 (49.0-54.0)
Connecting Rod Cap Nuts, lb-ft (Nm) ............... 23.1-26.0 (31.4-35.3)
Flywheel Bolt dry, lb-ft (Nm) ............... 61.5-68.7 (83.4-93.2)
Crankshaft Pulley Bolt, lb-ft (Nm) ............... 72.3-86.8 (98.0-117.7)
Rocker Shaft Bracket Bolt, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Camshaft Thrust Plate Bolt, lb-ft (Nm) ............... 5.8-8.7 (7.8-11.8)
Idler Gear Shaft Bolt, lb-ft (Nm) ............... 14.5-21.7 (19.6-29.4)
Timing Gear Case M6 Bolt, lb-ft (Nm) ............... 5.8-8.7 (7.8-11.8)
Timing Gear Case M8 Bolt, lb-ft (Nm) ............... 14.5-21.7 (19.6-29.4)
Oil Pan Drain Plug, lb-ft (Nm) ............... 36.2-43.5 (49.0-59.0)
Oil Pan Mounting Bolts, lb-ft (Nm) ............... 5.8-8.7 (7.8-11.8)
Oil Pump Cover Plate Screw, lb-ft (Nm) ............... 4.3-5.8 (5.9-7.8)
Oil Filter Cartridge, lb-ft (Nm) ............... 7.2-9.4 (9.8-12.7)
Oil Pressure Switch, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Injection Pump Delivery Valve Holder, lb-ft (Nm) ............... 25.3-28.9 (34.3-39.2)
Injection Pump Mounting Bolt, lb-ft (Nm) ............... 5.8-8.7 (7.8-11.8)
Injection Pump Gear Nut, lb-ft (Nm) ............... 28.9-36.2 (39.2-49.0)
Injection Nozzle Assembly, lb-ft (Nm) ............... 36.2-43.5 (49.0-59.0)
Injection Nozzle Retaining Nut, lb-ft (Nm) ............... 25.3-28.9 (34.3-39.2)
Injection Pipe Flare Nut, lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Fuel Leak-off Pipe Nut, lb-ft (Nm) ............... 14.5-20.3 (19.6-27.5)
Glow Plug, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Glow Plug Terminal Nut, lb-ft (Nm) ............... 0.7-1.1 (1.0-1.5)
Exhaust Manifold Nuts, lb-ft (Nm) ............... 14.5-21.7 (19.6-29.4)
Inlet Manifold Bolts, lb-ft (Nm) ............... 14.5-21.7 (19.6-29.4)
Water Pump Mounting Bolts, lb-ft (Nm) ............... 14.5-21.7 (19.6-29.4)
Thermostat Housing Bolts, lb-ft (Nm) ............... 14.5-21.7 (19.6-29.4)
Water Temperature Gauge Unit, lb-ft (Nm) ............... 14.5-21.7 (19.6-29.4)
Starter Motor Mounting Bolts, lb-ft (Nm) ............... 36.2-50.6 (49.0-68.6)
Starter B Terminal Nut, lb-ft (Nm) ............... 7.2-8.7 (9.8-11.8)
Alternator Mounting Bolt, lb-ft (Nm) ............... 36.2-50.6 (49.0-68.6)
Alternator Adjusting Strap Bolt, lb-ft (Nm) ............... 14.5-21.7 (19.6-29.4)
Flywheel Housing Bolts, lb-ft (Nm) ............... 36.2-50.6 (49.0-68.6)
Front Engine Support Bolts, lb-ft (Nm) ............... 14.5-21.7 (19.6-29.4)

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• Mitsubishi Engines Specs
  
• Mitsubishi L2C Specs
  
• Mitsubishi L2E Specs
  
• Mitsubishi L3A Specs
  
• Mitsubishi L3E Specs
  

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