Mitsubishi S6S Diesel Engine Forklift OEM Service Manual (P/N 99709-56110, OEM)
31.01 MB • Printable PDFs (ZIP Download)
Mitsubishi Models Covered & Key Technical Specifications
Models: FD35, FD40, FD45, FD50, FD50C, FD60, FD70
Sub-models / Variants: S6S Diesel Engine, Dry Clutch, Torque Converter, Wet Clutch
Technical Data:
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Engine configuration: 6-cylinder in-line, water-cooled, 4-stroke diesel
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Engine displacement: 4.996 liters (305 cu in)
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Compression ratio: 22:1
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Firing order: 1–5–3–6–2–4
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Cylinder bore x stroke: 94 x 120 mm (3.70 x 4.72 in)
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Engine oil capacity: 12 liters total (including 1 liter filter)
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Valve clearance (cold): 0.25 mm (0.0098 in) for both intake and exhaust
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Electrical system: 24V negative ground, 24–35A or 24–50A alternator output
Mitsubishi Manual Features & Content Preview
- Covers Mitsubishi FD35–FD50 and FD60–FD70 series forklifts powered by the S6S diesel engine, including dry and wet clutch configurations.
- Official Mitsubishi publication (P/N 99709-56110), delivering factory maintenance and service specifications for the complete engine build.
- Contains 56 exploded-view diagrams, 27 tolerance tables, and 19 torque-specification charts.
Instant Access to Engine System Documentation
When you need to get a forklift back on the line, waiting for shipping is not an option. This instant download service manual serves as your primary factory reference for the S6S diesel power unit. It cuts out the guesswork, delivering the exact timing gear settings, governor adjustments, and critical assembly clearances required for proper mechanical tuning.
The document provides deep technical insights for complete overhauls and sub-assembly maintenance. Coverage includes internal hard parts such as cylinder heads, pistons, connecting rods, crankshafts, and tappets. You will also find detailed inspection protocols for the lubrication and cooling systems—including oil pump tolerances, oil pressure relief valve specs, and centrifugal water pump data. The fuel system is thoroughly mapped out with sections dedicated to the injection pump, filter maintenance, and nozzle calibration.
Precision Values and Assembly Specs
Precision is everything in heavy-duty diesel work. Cylinder head bolt torque is documented at 118 ± 5 Nm (87 ± 4 lbf-ft) in the standard maintenance table, while flywheel bolt torque is specified at 83 ± 5 Nm (61 ± 4 lbf-ft). The valve timing charts note the intake valve opening at 30° B.T.D.C.
While these figures provide a solid overview of the technical depth, always rely on the complete OEM documentation provided in the manual and follow standard shop safety practices during any hands-on teardown or rebuild.
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