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Mitsubishi L3A Engine

General Technical Data

Engine Specifications

Engine Model ............... Mitsubishi L3A
Engine Type ............... 4-cycle 3-cylinder in-line water-cooled OVH swirl chamber diesel
Number of Cylinders ............... 3
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 2.5591 (65.0)
Engine Stroke, in (mm) ............... 2.7559 (70.0)
Displacement, cu.in (L) ............... 42.47 (0.696)
Rated Engine Power, hp (kW) ............... 11.0-15.0 (8.2-11.2)
Rated Engine Speed, rpm ............... 2500-3000
Peak Torque ............... 26.5-30.2 lb-ft (36.0-41.0 Nm) at 2000 rpm
Idle Speed ............... 800-900 rpm
Aspiration Type ............... Naturally Aspirated
Operating Speed ............... 1500-3000 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 circulation
Oil Pump Type ............... Trochoid type gear-driven
Oil Filter Type ............... Full-flow spin-on cartridge
Cooling System ............... Liquid-cooled forced circulation
Water Pump Type ............... Belt-driven centrifugal
Air Cleaner Type ............... Dry element
Starting System ............... Electric starter motor
Electrical System ............... 12V

Fuel System

Injection Pump Type ............... Bosch Bosch M type in-line mini pump
Governor Type ............... Mechanical centrifugal all-speed governor
Injection Nozzle Type ............... Throttle type nozzle
Injection Timing, deg ............... 17.0 BTDC
Injection Opening Pressure, psi (MPa) ............... 1707.0-1849.0 (11.77-12.75)
Fuel Delivery Pump ............... Mechanical diaphragm type or electric fuel pump
Fuel Filter Type ............... Spin-on paper element cartridge
Fuel Return Line ............... Spill pipe connection to fuel tank
Cold Start Aid ............... Sheathed type glow plugs
Maximum Fuel System Suction, in Hg (mm Hg) ............... 2.95 (75.0)
Fuel Grade Recommendation ............... ASTM No. 2-D diesel fuel oil

Dimensions and Weight

Overall Length, in (mm) ............... 19.9 (505)
Overall Width, in (mm) ............... 16.5 (420)
Overall Height, in (mm) ............... 19.7 (500)
Dry Engine Weight, lb (kg) ............... 166 (75)

Maintenance Data

Service Information

Maximum Cylinder Pressure, psi (MPa) ............... 1015.26 (7.0)
Compression Pressure at 280 rpm, psi (MPa) ............... 455.16 (3.14)
Minimum Allowable Compression Pressure, psi (MPa) ............... 370.0 (2.55)
Maximum Compression Pressure Imbalance, psi (MPa) ............... 36.26 (0.25)
Oil Pressure at Idle Speed, psi (MPa) ............... 14.22 (0.098) minimum
Oil Pressure at Rated Speed, psi (MPa) ............... 42.67-71.12 (0.294-0.491)
Thermostat Opening Temperature, F (C) ............... 160.0 (71.0)
Thermostat Full Open Temperature, F (C) ............... 185.0 (85.0)
Coolant Temperature Maximum, F (C) ............... 212.0 (100.0)
Fan Belt Deflection under 22 lb Force, in (mm) ............... 0.39-0.47 (10.0-12.0)
Intake Valve Clearance (Cold), in (mm) ............... 0.0098 (0.25)
Exhaust Valve Clearance (Cold), in (mm) ............... 0.0098 (0.25)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 15W-40
API Service Classifications ......................... CD, CE, or CF
Engine Oil Capacity with Filter, qt (L) ............... 3.80 (3.6)
Engine Oil Capacity (Base Pan), qt (L) ............... 3.17 (3.0)
Coolant Capacity (Engine Only), qt (L) ............... 1.59 (1.5)

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) ............... 2.5591-2.5598 (65.000-65.019)
Connecting Rod Small End Bushing I.D, in (mm) ............... 0.7876-0.7881 (20.006-20.017)
Connecting Rod Big End I.D, in (mm) ............... 1.6929-1.6935 (43.000-43.015)
Connecting Rod Journal Side Clearance, in (mm) ............... 0.0039-0.0138 (0.10-0.35)
Connecting Rod Center to Center Length, in (mm) ............... 4.2520-4.2528 (108.00-108.02)
Crankshaft Main Journal Outside Diameter, in (mm) ............... 1.6923-1.6929 (42.985-43.000)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0012-0.0028 (0.031-0.072)
Crankpin Journal Outside Diameter, in (mm) ............... 1.5742-1.5748 (39.985-40.000)
Crankpin Bearing Oil Clearance, in (mm) ............... 0.0010-0.0026 (0.025-0.065)
Crankshaft End Play, in (mm) ............... 0.0020-0.0118 (0.05-0.30)
Piston Skirt Outside Diameter, in (mm) ............... 2.5574-2.5583 (64.950-64.970)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0016-0.0027 (0.040-0.069)
Piston Pin Bore Inside Diameter, in (mm) ............... 0.7874-0.7877 (20.001-20.009)
Piston Pin Outside Diameter, in (mm) ............... 0.7871-0.7874 (19.993-20.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.00004-0.00063 (0.001-0.016)
Piston Pin to Small End Bushing Clearance, in (mm) ............... 0.0002-0.0009 (0.006-0.024)
Top Ring Groove Width, in (mm) ............... 0.0591-0.0598 (1.500-1.520)
Second Ring Groove Width, in (mm) ............... 0.0591-0.0598 (1.500-1.520)
Oil Ring Groove Width, in (mm) ............... 0.1575-0.1583 (4.000-4.020)
Top Ring Groove Side Clearance, in (mm) ............... 0.0020-0.0035 (0.050-0.090)
Second Ring Groove Side Clearance, in (mm) ............... 0.0012-0.0028 (0.030-0.070)
Oil Ring Groove Side Clearance, in (mm) ............... 0.0008-0.0024 (0.020-0.060)
Top Ring End Gap, in (mm) ............... 0.0059-0.0118 (0.15-0.30)
Second Ring End Gap, in (mm) ............... 0.0059-0.0118 (0.15-0.30)
Oil Ring End Gap, in (mm) ............... 0.0079-0.0157 (0.20-0.40)
Cylinder Head Bottom Surface Distortion, in (mm) ............... 0.0020 (0.05)
Intake Valve Stem Outside Diameter, in (mm) ............... 0.2583-0.2589 (6.560-6.575)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 0.2571-0.2579 (6.530-6.550)
Valve Guide Inner Diameter, in (mm) ............... 0.2600-0.2606 (6.604-6.619)
Intake Valve Guide to Stem Clearance, in (mm) ............... 0.0011-0.0023 (0.029-0.059)
Exhaust Valve Guide to Stem Clearance, in (mm) ............... 0.0021-0.0035 (0.054-0.089)
Valve Seat Width Angle Settings, deg ............... 45.0
Intake Valve Seat Contact Width, in (mm) ............... 0.0472-0.0591 (1.20-1.50)
Exhaust Valve Seat Contact Width, in (mm) ............... 0.0472-0.0591 (1.20-1.50)
Valve Spring Free Length, in (mm) ............... 1.4882 (37.80)
Camshaft Journal Diameter (Front), in (mm) ............... 1.4951-1.4957 (37.975-37.990)
Camshaft Journal Diameter (Center), in (mm) ............... 1.4557-1.4563 (36.975-36.990)
Camshaft Journal Diameter (Rear), in (mm) ............... 1.3376-1.3382 (33.975-33.990)
Camshaft Journal Clearance, in (mm) ............... 0.0012-0.0028 (0.030-0.071)
Cam Height (Intake), in (mm) ............... 1.1398-1.1417 (28.950-29.000)
Cam Height (Exhaust), in (mm) ............... 1.1398-1.1417 (28.950-29.000)
Rocker Arm Shaft Outside Diameter, in (mm) ............... 0.4718-0.4724 (11.984-12.000)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.4724-0.4731 (12.000-12.018)
Rocker Arm Bushing to Shaft Clearance, in (mm) ............... 0.0000-0.0013 (0.000-0.034)
Tappet Outside Diameter, in (mm) ............... 0.7856-0.7864 (19.955-19.976)
Tappet Guide Hole Diameter, in (mm) ............... 0.7874-0.7882 (20.000-20.021)
Tappet to Guide Hole Clearance, in (mm) ............... 0.0009-0.0026 (0.024-0.066)
Idler Gear Shaft Outside Diameter, in (mm) ............... 1.3374-1.3380 (33.970-33.985)
Idler Gear Bushing Inner Diameter, in (mm) ............... 1.3386-1.3396 (34.000-34.025)
Idler Gear Shaft to Bushing Clearance, in (mm) ............... 0.0006-0.0022 (0.015-0.055)

Tightening Torques

Cylinder Head Bolt Cold (Stage 1), lb-ft (Nm) ............... 25.32 (34.33)
Cylinder Head M10 Bolt (Stage 2), lb-ft (Nm) ............... 54.25-57.86 (73.55-78.45)
Cylinder Head M8 Bolt (Stage 2), lb-ft (Nm) ............... 14.47-21.69 (19.61-29.42)
Connecting Rod Cap Nut, lb-ft (Nm) ............... 23.15-25.32 (31.38-34.33)
Main Bearing Cap Bolt, lb-ft (Nm) ............... 36.16-39.78 (49.03-53.94)
Flywheel Bolt, lb-ft (Nm) ............... 43.40-47.01 (58.84-63.74)
Crankshaft Pulley Bolt, lb-ft (Nm) ............... 72.33-79.57 (98.07-107.87)
Rocker Shaft Bracket Bolt, lb-ft (Nm) ............... 10.85-14.47 (14.71-19.61)
Rocker Arm Adjusting Locknut, lb-ft (Nm) ............... 10.85-14.47 (14.71-19.61)
Cylinder Head Cover Cap Nut, lb-ft (Nm) ............... 3.62-5.06 (4.90-6.86)
Timing Gear Case Bolt, lb-ft (Nm) ............... 14.47-21.69 (19.61-29.42)
Camshaft Thrust Plate Bolt, lb-ft (Nm) ............... 7.23-10.85 (9.81-14.71)
Idler Gear Shaft Bolt, lb-ft (Nm) ............... 21.69-28.93 (29.42-39.22)
Oil Pump Cover Plate Bolt, lb-ft (Nm) ............... 7.23-10.85 (9.81-14.71)
Oil Pan Mounting Bolt, lb-ft (Nm) ............... 7.23-10.85 (9.81-14.71)
Oil Pan Drain Plug, lb-ft (Nm) ............... 28.93-36.16 (39.22-49.03)
Oil Pressure Switch, lb-ft (Nm) ............... 10.85-14.47 (14.71-19.61)
Oil Filter Cartridge Spin-On, lb-ft (Nm) ............... 8.68-11.57 (11.77-15.69)
Fuel Pump Delivery Valve Holder, lb-ft (Nm) ............... 25.32-28.93 (34.33-39.22)
Fuel Pump Mounting Bolt or Nut, lb-ft (Nm) ............... 10.85-14.47 (14.71-19.61)
Fuel Pump Gear Locknut, lb-ft (Nm) ............... 28.93-36.16 (39.22-49.03)
Fuel Injection Nozzle Assembly to Head, lb-ft (Nm) ............... 36.16-43.40 (49.03-58.84)
Fuel Injection Nozzle Nut, lb-ft (Nm) ............... 25.32-28.93 (34.33-39.22)
Fuel Leak-Off Pipe Nut, lb-ft (Nm) ............... 18.08-21.69 (24.52-29.42)
Fuel Injection High Pressure Pipe Nut, lb-ft (Nm) ............... 18.08-21.69 (24.52-29.42)
Glow Plug Body Installation, lb-ft (Nm) ............... 10.85-14.47 (14.71-19.61)
Glow Plug Terminal Nut, lb-ft (Nm) ............... 1.08-1.45 (1.47-1.96)
Water Pump Assembly Bolt, lb-ft (Nm) ............... 14.47-21.69 (19.61-29.42)
Thermostat Housing Bolt, lb-ft (Nm) ............... 14.47-21.69 (19.61-29.42)
Water Temperature Gauge Unit Sender, lb-ft (Nm) ............... 14.47-21.69 (19.61-29.42)
Intake Manifold Mounting Bolt, lb-ft (Nm) ............... 14.47-21.69 (19.61-29.42)
Exhaust Manifold Mounting Stud Nut, lb-ft (Nm) ............... 14.47-21.69 (19.61-29.42)
Starter Motor Mounting Bolt, lb-ft (Nm) ............... 28.93-36.16 (39.22-49.03)
Alternator Pivot Support Bolt, lb-ft (Nm) ............... 14.47-21.69 (19.61-29.42)
Alternator Adjusting Link Strap Bolt, lb-ft (Nm) ............... 10.85-14.47 (14.71-19.61)

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• Mitsubishi Engines Specs
  
• Mitsubishi L2C Specs
  
• Mitsubishi L2E Specs
  
• Mitsubishi L3C Specs
  
• Mitsubishi L3E Specs
  

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