Komatsu Diesel Engine 3D72-2, 3D75-2, 3D78-1, 3D84-2, 3D84N-2, 4D84-2 Shop Manual
Reference for Komatsu engine models 3D72-2 through 4D84-2. Documents engine specifications, disassembly, and reassembly procedures. Part number 00-1.
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Sample pages from the Komatsu Diesel Engine 3D72-2, 3D75-2, 3D78-1, 3D84-2, 3D84N-2, 4D84-2 Shop Manual manual
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Komatsu Models Covered & Key Technical Specifications
Models: 3D72-2, 3D75-2, 3D78-1, 3D84-2, 3D84N-2, 4D84-2
Sub-models / Variants: 2TN66E, 3TN66E, 3TNA72E, 3TN75E, 3TNC78E, 3TN82E, 3TN82TE, 4TN82E, 4TN82TE, 3TN84E, 3TN84TE, 4TN84E, 4TN84TE, Power pack variants
Trade Names: Komatsu Diesel Engine
Build Years: 1993
Serial Numbers: 728402 (Manual reference number)
Technical Data:
- Engine type: 4-stroke cycle, water-cooled diesel
- Combustion systems: Swirl pre-combustion, Direct injection
- Aspiration: Natural, Turbocharged
- Number of cylinders: 2, 3, 4
- Fuel injection pressure: 19.61 MPa (2844 PSI)
- Compression ratio range: 17.0:1 – 23.0:1
- Lubrication: Forced lubrication with trochoid pump
- Governor: Mechanical centrifugal
Komatsu Manual Features & Content Preview
Komatsu Diesel Engine 72-2 to 84-2 Series Manual
- Covers Komatsu 3D72-2, 3D75-2, 3D78-1, 3D84-2, 3D84N-2, and 4D84-2 series engines, plus variant TN-series specs including 2TN66E, 3TN66E, 3TNA72E, 3TN75E, 3TN82E, 4TN82E, 3TN84E, and 4TN84E
- Original OEM publication P/N SEBM002400, published November 1993
- Includes 12 exploded-view diagrams for fuel injection equipment and 15 detailed specification tables for engine components
- OCR text layer lets you jump to a torque spec by keyword
- Laid out for standard letter and A4 printing
- This 1993 first edition is the factory reference for 72-2, 75-2, 78-1, and 84-2 series engine builds — it is the primary source for assembly and inspection standards
Engine Service Documentation
The Komatsu diesel engine manual documents structural and functional details for the 3D72-2, 3D75-2, 3D78-1, 3D84-2, 3D84N-2, and 4D84-2 engine families. Chapters detail the basic engine construction, including cylinder block inspection, cylinder head maintenance, piston and pin sizing, connecting rod alignment, crankshaft balance, and timing gear configuration. Lubrication and cooling systems are explained through structural overviews to support professional-grade assembly and disassembly work.
Fuel injection system documentation covers YPES and YPFR pump types, detailing governor construction, adjustment parameters, and testing procedures. Testing and adjusting data sections provide reference charts for verifying engine timing, output metrics, and injection pressure. This technical factory workshop manual includes comprehensive dimensional charts and service standards for all major engine components.
Technical Specification Highlights
Engine maintenance standards are defined for essential wear limits. Valve clearance for intake and exhaust valves is documented at 0.2 mm across the listed engine series. Cylinder head bolt torque values are specified in a multi-stage sequence, with final-stage values reaching 7.5–8.5 kg-m for 4TN84E/4TN84TE variants. Standard injection pressure is listed at 19.61 MPa (2844 PSI) for the majority of the direct-injection engine models.
Reference only — always consult a certified technician before performing service on this equipment.
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