2003 Komatsu SA6D140E-3, SAA6D140E-3 & SDA6D140E-3 Diesel Engine Shop Manual (P/N SEBM022209)

This 2003 Komatsu 140-3 Series Shop Manual, document reference SEBM022209, covers the SA6D140E-3, SAA6D140E-3, and SDA6D140E-3 diesel engines. The publication is marked as printed in Japan 11-03 (01).

• Engine overhaul: Cylinder-head and block disassembly, piston and connecting-rod work, crankshaft and camshaft installation, timing-gear assembly, and wear inspection.

• Fuel system: Denso ECD-U2 common-rail documentation, fuel-supply-pump removal and installation, injector installation, air bleeding, low-pressure fuel checks, and leak testing.

• Engine testing: Compression, blow-by, boost, and oil-pressure measurements, valve-clearance adjustment, S-mode troubleshooting, run-in schedules, performance curves, and performance-test standards.

• Electrical diagnostics: E-mode error-code troubleshooting, sensor and controller checks, CRI electrical schematics, and starting-motor and alternator circuit diagrams.

• Cooling and lubrication: Water-pump removal and installation, thermostat inspection criteria, oil-pump wear standards, aftercooler layouts, and fan-belt adjustment.

• Accessories: Front PTO assemblies, air compressors, exhaust brakes, and electrical intake-air heaters, with component views and operating descriptions.

Written for service workshop technicians, this manual includes work requiring dedicated Komatsu tools and engine overhaul equipment.

Engine Configuration and Overhaul

Application differences: D155AX-5 documentation distinguishes engine serial numbers 110001–112349 from 112350 and up, including changes to air-cleaner and alternator arrangements. This is the engine volume; complete machine repairs require the relevant chassis and other machine-specific manuals.

Repair depth: The maintenance standards cover piston-ring gaps, connecting-rod tolerances, crankshaft journals, and cylinder-head and block inspection. They provide the acceptance and wear limits needed to assess disassembled parts before deciding on repair or replacement.

The repair chapter covers valve-seat insert replacement and oversize machining, cylinder-head pressure testing, and valve-guide and crosshead-guide replacement. It also documents camshaft-bushing, crankshaft-gear, cam-gear, and flywheel-ring-gear replacement.

Overall drawings provide dimensions for test-bench installation, while timing-gear views support alignment and backlash checks. Assembly instructions distinguish standard and sleeved rear crankshaft seals and explain plastic-region bolt tightening and reuse checks. General torque charts cover flared nuts and hose couplings alongside the component-specific fastener data.

The liner assembly notes warn that prolonged oil exposure can swell and deteriorate the liner O-rings and clevis seals.

Common-Rail Service and Fault Diagnosis

Fault isolation: S-mode charts address starting problems, hunting, low output, exhaust smoke, oil contamination, and overheating. E-mode troubleshooting pairs controller fault codes with electrical test values, connector references, and related circuit diagrams. These checks help distinguish sensor or pump-control-valve faults from wiring faults before components are replaced.

The CRI section explains the fuel-supply-pump PCVs, injector TWVs, and common-rail pressure control. The separate pump-removal procedure identifies the pulling fixture, including plate 795-471-1320.

Reduced-cylinder operation is explained, but its machine-panel controls and on-machine electrical troubleshooting also require the applicable machine shop manual.

The fuel-pipe installation notes identify wear and vibration damage at pipe connections when clamps or supports are loose or missing. Follow the manual's precautions for residual fuel pressure and high-voltage injector-drive circuits.

Cooling, Turbocharging, and Auxiliary Equipment

Cooling System Diagrams distinguish the SA6D140E-3 water-cooled aftercooler, SAA6D140E-3 air-cooled arrangement, and SDA6D140E-3 separate aftercooler cooling circuit. The Lubrication System Diagram traces oil flow through the pump, cooler, and piston-cooling nozzles.

The Komatsu KTR110L turbocharger section covers air-cooled and water-cooled versions with bearing-clearance and shaft-play criteria. Accessory documentation identifies air compressors for the HD325-6 and PC1800-6 front engine, plus exhaust-brake arrangements for the HD325-6, HM350-1, and HM400-1.

A Preview of Valve-Clearance and Idle Specifications

These examples are a small selection of the engine adjustment data in the manual. For the 140-3 valve train, cold clearance between the rocker arm and crosshead is 0.35 ± 0.02 mm for intake valves and 0.57 ± 0.02 mm for exhaust valves.

The SA6D140E-3 specification for the PC600-6 lists a low-idle speed of 800 ± 25 rpm.

Text Search, Section Bookmarks, and PDF Contents

Search and diagram detail: Body text and many tables are searchable, while lettering within some diagrams and troubleshooting charts is not. Embedded bookmarks link to the technical sections. Small connector and pin labels are legible when enlarged.

The download contains one printable 361-page PDF. The total already includes the original cover, three revision-list pages, and three blank pages.