Mitsubishi S4S, S6S Diesel Engine Service Manual (tp6840)

These Mitsubishi S4S and S6S engines usually live in forklifts, generators, and small industrial machines working in dusty yards, warehouses, or construction sites. This service manual is what I’d pull out when I need to prove what’s actually wrong before we start ordering parts. If an engine is hard to start cold, blowing white smoke, or down on power under load, I use this book to trace the fault step by step—checking clearances, timing, and fuel settings—so we repair the cause, not just swap parts.

Applications & Use Cases

• Confirm a suspected failure in fuel, valve train, or bottom end before replacing injectors, pumps, or major components.
• Plan and sequence an overhaul, from prep and teardown through inspection and reassembly so nothing gets mixed up.
• Verify critical adjustments like timing, clearances, and torques after repairs to avoid repeat failures.
• Trace abnormal noises or vibrations back to specific components instead of guessing.
• Identify correct parts orientation and routing for gaskets, lines, and external accessories during reassembly.

FAQ

Q: Can I use this manual on a tablet at the machine?

A: Yes, it works well digitally; you can zoom diagrams and keep it open next to the engine while you test and adjust.

Q: Is it worth printing sections of this manual?

A: Many techs print the pages they need for a job, mark notes or measurements on them, and keep the clean master file saved.

Safety Note

Always lock out the machine, cool the engine, and follow all safety cautions in the manual before opening any system.

Mitsubishi S4S, S6S Diesel Index:

Safety Cautions
General
Mainterønce Standards
Special Tools
Overhaul Instructions
Preparation for Disassembly
Main Ergine Parts
Fuel System
Lubricafion System
Cooling System
Inlet and Exhaust Systems
Electrical System
Inspection, Adjustment,
Break-ln Operation And Per-
formance Tests
Others
Disassembly
Inspection and Repair
Reassembly
Removal
Disassembly, Inspection and Reassembly
Installation
Removal
Disassembly, Inspection and Reassembly
Installation
Removal
Disassembly, Inspection and Reassembly
Installation
Removal
Disassembly, Inspection and Reassembly
Installation
Removal
Disassembly, Inspection and Reassembly
Installation
Adjustment of Engine
Break-In Operation
Performance Tests
Disassembly and Reassembly Of
General

Kohler