This comprehensive service repair manual provides detailed instructions and information for servicing and repairing Mitsubishi SL-Series (S3L, S3L2, S4L, S4L2) diesel engines. It covers a wide range of topics, from basic engine identification and serial number location to in-depth procedures for disassembling, inspecting, and reassembling various engine components. The manual features detailed electrical and hydraulic diagrams, actual real photo illustrations, and clear step-by-step instructions to guide you through every repair process.

The manual covers a wide range of procedures, including:

* **General Information:** Learn about model identification, serial number locations, component locations, and engine specifications.
* **Overhaul Instructions:** Determine when an engine overhaul is necessary and learn how to perform compression pressure measurements.
* **Troubleshooting:** Diagnose and troubleshoot engine problems, covering both general engine issues and specific issues with the starting system.
* **Disassembly:** Thorough instructions for disassembling the engine, covering everything from draining fluids and removing electrical components to taking apart the cylinder head, timing gears, and crankshaft assembly.
* **Inspection:** Detailed guides for inspecting individual components, including the cylinder head, valve mechanism, timing gears, flywheel, cylinder block, crankshaft, pistons, and oil pan.
* **Assembly:** Clear and concise assembly instructions, covering the reassembly of all major engine components, including the cylinder block, crankshaft, pistons, timing gears, flywheel, cylinder head, and other systems.
* **Electrical System:** Detailed information about the electrical system, including wiring diagrams, starter and alternator disassembly and assembly procedures, and instructions for inspecting and testing components.
* **Cooling System:** Comprehensive instructions for inspecting and servicing the cooling system, including the water pump, thermostat, thermoswitch, and thermounit.
* **Lubrication System:** Instructions for inspecting and servicing the lubrication system, covering the oil pump, oil pressure switch, and pressure relief valve.
* **Fuel System:** Detailed information about the fuel system, including procedures for inspecting and servicing fuel injection nozzles, fuel injection pumps, governors, fuel pumps, and fuel filters.
* **Air Inlet System and Exhaust System:** Covers inspection and maintenance procedures for the air inlet and exhaust systems.
* **Maintenance:** Extensive maintenance information, including lubrication and maintenance charts, engine oil and oil filter specifications, valve clearance adjustment procedures, fuel injection timing adjustments, fuel filter maintenance, fuel system priming instructions, idle RPM setting, fuel injection nozzle inspection and replacement, and fan belt maintenance.
* **Service Data:** Essential service data, including specifications for various engine components, tightening torques for bolts and nuts, sealant information, and a list of special tools.

This manual is an invaluable resource for anyone who works on Mitsubishi SL-Series diesel engines and provides comprehensive information to help you solve problems, perform repairs, and maintain your engine efficiently.

## Mitsubishi SL-Series Diesel Engines: Powering a Legacy of Reliability

The Mitsubishi SL-Series encompasses a range of powerful and dependable diesel engines, designed for applications ranging from heavy-duty trucks and construction equipment to marine vessels and power generation. The series includes the S3L, S3L2, S4L, and S4L2 models, each offering varying power outputs and features to meet diverse operational needs. These engines are renowned for their robust construction, durable components, and high fuel efficiency, making them a popular choice for demanding environments.

The SL-Series engines are engineered for low operating costs and long service life. Their durable cast-iron cylinder blocks and forged steel crankshafts withstand the stresses of continuous heavy-duty operation. The advanced fuel injection systems and optimized combustion chambers ensure efficient fuel utilization, minimizing emissions and maximizing performance. Furthermore, the SL-Series incorporates advanced technologies for reduced noise and vibration, contributing to a comfortable operator experience. The availability of various power ratings and configurations allows users to tailor the engine to their specific application requirements, making it suitable for a wide range of industries. The SL-Series engines are a testament to Mitsubishi's commitment to quality and innovation, offering a reliable and dependable power source for demanding applications.