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Mitsubishi S4L - User Manual

Mitsubishi S4L
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Service Manual Mitsubishi SL-Series diesel engines
Version 08/2004
ENGLISH
INTRODUCTION
This service manual has instructions and procedures for the Mitsubishi SL-series diesel engines.
The information, specifications and illustrations in this manual are on the basis of the information that was current at
the time this issue was written.
Correct servicing, test and repair procedures will give the engine a long service life. Before starting a test, repair or
rebuild job, the serviceman must read the respective sections of this manual to know all the component he will work
on.
Continuing improvement of product design may have caused changes to your engine which are not included in this
manual.
Whenever a question arises regarding your engine, or this manual, consult your Mitsubishi dealer for the latest
available information.
Service Manual
Mitsubishi SL-Series diesel engines
Version 08/2004
Copyright © 2004 MHI Equipment Europe B.V.

Table of Contents

Questions and Answers

  • M
    Michael FrazierAug 8, 2025
    How to fix hard starting of Mitsubishi S4L?
    • K
      Kyle WoodsAug 8, 2025
      If your Mitsubishi Engine is hard starting, there are several potential causes. First, check the control timer unit. Next, check the fuel filter, fuel lines, and fuel tank. Then, make adjustments to the timing and clearance, as well as the nozzles. Finally, check the valves, piston rings, and cylinder head gasket. If none of these steps resolve the issue, the fuel injection pump may be faulty.
  • B
    Barbara RobertsAug 13, 2025
    Why is my Mitsubishi S4L Engine overheating?
    • L
      Leonard BrandtAug 14, 2025
      If your Mitsubishi Engine is overheating, several factors could be at play. Start by checking the components and oil level. Also, make adjustments to the timing and the governor. Keep in mind that continuous full-load operation can also cause overheating, so consider adjusting the engine's workload.
  • A
    Allison SchneiderAug 20, 2025
    What to do if my Mitsubishi S4L Engine has low power or loss of power?
    • L
      Lisa PenaAug 20, 2025
      If your Mitsubishi Engine is experiencing low power or a loss of power, there are several potential solutions. Begin by making adjustments to the clearance and timing. Then, inspect the fuel tank, fuel filter, and fuel lines. After that, make adjustments to the governor and nozzles. Finally, check the valves, piston rings, and cylinder head gaskets. If none of these steps resolve the issue, the fuel injection pump may be faulty.
  • J
    Jason GregoryAug 27, 2025
    What to do if Mitsubishi S4L produces black exhaust smoke?
    • B
      Bryan JacksonAug 27, 2025
      If your Mitsubishi Engine is producing black exhaust smoke, it may be due to several factors. Try making adjustments to the clearance and timing, as well as the nozzles. Additionally, check the valves, piston rings, and cylinder head gasket. If the issue persists, the fuel injection pump may be faulty.
  • A
    Amber MartinezSep 1, 2025
    How to troubleshoot erratic idle speeds on a Mitsubishi Engine?
    • M
      Meghan BanksSep 1, 2025
      If your Mitsubishi Engine has erratic idle speeds, consider the following adjustments. Start by making adjustments to the clearance and timing. Then, make adjustments to the nozzles. Additionally, check the valves, piston rings, and cylinder head gasket. If the problem continues, the fuel injection pump may be faulty.

Summary

GENERAL INFORMATION

1 MODEL IDENTIFICATION AND SERIAL NUMBER LOCATION

Details on engine model and serial number identification and location.

3 SPECIFICATIONS

Technical specifications for various engine models, including dimensions and capacities.

OVERHAUL INSTRUCTIONS

4 DETERMINING WHEN TO OVERHAUL THE ENGINE

Guidelines for identifying engine wear and determining the need for overhaul.

5 COMPRESSION PRESSURE MEASUREMENT

Procedure for measuring engine compression pressure and interpreting results.

6 TROUBLESHOOTING

General approach and specific charts for diagnosing and resolving engine problems.

DISASSEMBLY

14 CYLINDER HEAD AND VALVE MECHANISM

Procedures for removing and disassembling the cylinder head and valve train components.

16 Cylinder Block, Crankshaft, Pistons and Oil Pan

Procedures for removing and inspecting the cylinder block, crankshaft, pistons, and oil pan.

INSPECTION

MAINTENANCE

46 LUBRICATION AND MAINTENANCE CHART

Schedule of recommended service intervals for lubrication and maintenance tasks.

47 ENGINE OIL AND OIL FILTER

Engine oil specifications, level check, and procedures for oil and filter changes.

49 FUEL INJECTION TIMING

Methods and adjustments for setting the engine's fuel injection timing.

SERVICE DATA

55 SPECIFICATIONS

Detailed specifications for engine components, cooling, electrical, and air systems.

56 TIGHTENING TORQUES

Table of specified tightening torques for major bolts, nuts, and plugs.

Mitsubishi S4L Specifications

General IconGeneral
AspirationNaturally Aspirated
Fuel TypeDiesel
Cooling SystemWater-cooled
Starting SystemElectric Starter
Lubrication SystemForced Lubrication
Engine Type4-stroke, vertical, water-cooled, direct injection diesel engine
Max Power Output48.5 kW (65 hp) at 2200 rpm

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