Komatsu 6D140-1 Diesel Engine Shop Manual – 2005 (P/N SEBE62120112)

February 2005 Komatsu factory shop manual, P/N SEBE62120112, for the S6D140-1, SA6D140-1, and SAA6D140-1 diesel-engine family used in construction, industrial, and generator applications.

Printable PDF with Chapter Bookmarks

Search and diagram detail: Text search is available on only a few pages; most service pages are image-only and cannot be searched. Embedded bookmarks provide chapter and subsection navigation. Small wiring and connector labels are readable when enlarged.

ZIP download containing one printable, English-language PDF with 348 pages, including 22 pages of front matter covering the original cover, contents, revision lists, safety information, foreword, and introductory reference tables.

Engine Overhaul, Fuel-System Testing, and Fault Diagnosis

The following selected contents outline the main workshop coverage. Additional topics include coating-material references and electrical wire-code tables.

• Engine systems: Structure and operation of the intake, exhaust, lubrication, fuel, and cooling systems, including turbocharger, after-cooler, and engine-mounted electrical equipment.

• Testing and adjustment: Valve-clearance adjustment, compression testing, injection timing, nozzle-pressure checks, fuel-cut controls, V-belt tension, injection-pump calibration, run-in schedules, and performance criteria.

• Symptom-based diagnosis: Sixteen troubleshooting charts cover starting faults, poor acceleration, stalling, hunting, low power, exhaust smoke, oil and coolant problems, overheating, noise, and vibration.

• Engine disassembly and assembly: Step-by-step teardown and rebuild procedures, component handling, tightening sequences, plastic-range bolt control, inspection points, and final adjustments.

• Repair and replacement: Cylinder-head resurfacing, valve-seat inserts, valve guides, crosshead guides, valve grinding, pressure testing, cam bushings, gears, and connecting-rod small-end bushings.

• Turbocharger and exhaust brake: Separate disassembly and assembly procedures, rotor-clearance checks, and exhaust-brake adjustment, road-testing, and troubleshooting material.

Written for service personnel performing workshop repairs, this manual assumes access to appropriate measuring equipment, lifting equipment, and the specified service tools.

Application and Configuration Differences

This manual is organized around the engine family rather than a single host machine. Specification tables distinguish fuel-pump and governor types, mechanical and electronic control, alternator and starting-motor arrangements, air-compressor fitment, and after-cooled configurations.

Turbocharger data distinguishes the Komatsu KTR110 from the Schwitzer S3A used in specified generator applications. Generator coverage includes an electronically controlled OEM 200 kW configuration, six-pole generator builds, and SAA6D140-1 generator data with an air-cooled after-cooler.

The SA6D140-M-1 has separate specification, calibration, and test-data tables. Additional sections include SA6D140-B-1 fuel-cut solenoid adjustment for the EG380BS-1 and pump-calibration sheets for the 6M132A-2/SA6D132-1 and 6M140A-2/SA6D140-1. These calibration sheets do not constitute separate overhaul manuals for those applications.

Serial-specific selection: Match the engine model, host application, engine number, and pump assembly number before selecting specifications or calibration data. The tables distinguish lubrication-capacity changes, fuel-cut control arrangements, and changes to the turbocharger, cylinder head, valve system, piston rings, and idler gears.

For the GS360-2, the specification and pump-calibration sections use the 12024/12025 split, while one Testing and Adjusting Data table labels the later configuration “12065 and up.” That discrepancy requires attention when selecting the applicable test data.

Fuel-System Checks and Diagnostic References

Injection-timing coverage distinguishes match-mark alignment for an unrepaired pump returned to its original engine from the delivery-valve method used after pump repair or replacement. Calibration sheets identify pump assembly numbers and distinguish service-test parts from manufacturer-test parts.

The troubleshooting charts combine operator observations, preliminary checks, and confirming tests. For black smoke, for example, they relate air-cleaner restriction, intake leakage, injection faults, and compression problems to separate diagnostic checks, supporting fault isolation before unnecessary engine disassembly.

Visual references include lubrication- and cooling-system charts, valve-timing diagrams, KTR110 section views, and engine-stop motor circuit and connector views. Fuel-system charts, alternator and starting-motor schematics, intake-air heater wiring diagrams, and application-specific performance curves are also included.

Testing equipment references identify multi-tachometer 799-203-8000, engine pressure measuring kit 799-203-2002, and compression gauge 795-502-1205 with adapter 795-502-1510. The operating test-data tables are not instructions for changing injection-pump output settings.

Rebuild Detail and Component Inspection

The teardown and assembly chapter emphasizes the SA6D140-1 on an overhaul stand. It explains that details vary with engine base, serial number, and whether an after-cooler is fitted.

Internal work extends through the cylinder liners, pistons, connecting rods, crankshaft, camshaft, timing gears, and flywheel. Maintenance-standard tables provide inspection criteria and repair limits for these parts, the cylinder head and valve train, oil pump and valves, oil cooler, water pump, and thermostat.

Cylinder-head repair includes oversize valve-seat insert machining, guide replacement, valve finishing, and pressure testing. The valve-seat procedure identifies puller 795-100-4800. Connecting-rod bushing replacement includes the required finishing of the semi-finished bushing bore.

Assembly cautions: Incorrect push-rod seating or excessive loading during rocker-arm installation can bend the push rods. Forcing the turbocharger blower impeller during removal or installation can damage it; rotor work also requires dynamic balancing, with complete rotor replacement specified when the balance check cannot be performed.

Cylinder-head, main-cap, connecting-rod, and flywheel bolts use plastic-range turning-angle tightening, with punch marks used to track reuse. Overall engine drawings and the weight table support component identification and lifting preparation.

Engine-Only Scope and Workshop Safety

This is an engine shop manual. It covers engine-mounted accessories and related circuits but does not replace the separate machine documentation for transmissions, hydraulics, steering, chassis brakes, or complete vehicle wiring.

Engine teardown, cylinder-head and flywheel handling, fuel-injection testing, turbocharger repair, and dynamometer operation involve heavy components, rotating machinery, stored energy, and high-pressure fuel. Review the Komatsu safety instructions, isolate the electrical system, and use rated lifting and test equipment before starting service.

Examples of Valve and Lubrication Specifications

The valve-adjustment procedure specifies intake clearance of 0.43 mm and exhaust clearance of 0.80 mm with the engine cold at 20°C, measured between the crosshead and rocker arm.

The lubrication-system section specifies regulator-valve opening pressure of 3.2 ± 0.2 kg/cm² and piston-cooling valve opening pressure of 1.4 ± 0.2 kg/cm², alongside section views explaining their relationship to the main and piston-cooling galleries.