Komatsuengine(no series)
Komatsu S6D140-1Z(S/N 17626-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S6D140-1Z (S/N 17626-UP) is a six-cylinder, turbocharged, aftercooled diesel engine manufactured for heavy-duty construction applications. It powers the Komatsu D155A-3 bulldozer series, specifically units with equipment serial numbers 60001 and up. This engine delivers high torque and durability for earthmoving and mining operations. Production years for this specific engine configuration span from the late 1980s through the early 2000s. It succeeded earlier 6D140 variants and was later replaced by the SA6D140E-2 series in subsequent dozer generations. Configurations offered include industrial and mining variants, with specific emissions and cooling packages tailored to regional operating conditions.
Across the S6D140-1Z lifecycle, changes focused on refining fuel injection precision and enhancing cooling system efficiency to meet evolving operational demands. The machine remains critical in the used and parts market due to the widespread deployment of the D155A-3 dozer in large-scale mining and infrastructure projects. Its robust cast-iron block and modular design allow for extensive remanufacturing and component sourcing. The S6D140-1Z is highly sought after for its reliability in high-load environments, making it a staple for fleet managers maintaining older Komatsu heavy equipment. Availability of aftermarket and genuine parts sustains its long-term serviceability.
Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.
Komatsu S6D140-1Z(S/N 17626-UP) specifications
Engine
| Model | S6D140-1Z |
| Series | 6D140-1 Series |
| Cylinders | 6 |
| Displacement | 14.0 L (854 cu in) |
| Bore | 140 mm |
| Aspiration | Turbocharged and aftercooled |
| Emissions Tier | Not documented for this exact serial range — verify with your dealer |
Weights
| Operating Weight | Not documented for this exact serial range — verify with your dealer |
| Shipping Weight | Not documented for this exact serial range — verify with your dealer |
| Ground Pressure | Not documented for this exact serial range — verify with your dealer |
Dimensions
| Transport Length | Not documented for this exact serial range — verify with your dealer |
| Transport Width | Not documented for this exact serial range — verify with your dealer |
| Transport Height | Not documented for this exact serial range — verify with your dealer |
| Track Gauge | Not documented for this exact serial range — verify with your dealer |
| Ground Clearance | Not documented for this exact serial range — verify with your dealer |
Performance
| Travel Speed | Not documented for this exact serial range — verify with your dealer |
| Gradeability | Not documented for this exact serial range — verify with your dealer |
| Dig/Dump/Lift Force | Not documented for this exact serial range — verify with your dealer |
Service capacities (summary)
| Fuel Tank | Not documented for this exact serial range — verify with your dealer |
| Hydraulic System | Not documented for this exact serial range — verify with your dealer |
| Engine Oil | Not documented for this exact serial range — verify with your dealer |
| Cooling System | Not documented for this exact serial range — verify with your dealer |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu S6D140-1Z(S/N 17626-UP) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the S6D140-1Z(S/N 17626-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Komatsu Oil Wear Analysis (KOWA) at every 500-hour interval to monitor engine wear metals and coolant contaminants. Track hydraulic oil particle counts and viscosity changes to predict pump and valve failures. Monitor DEF levels and quality to prevent SCR system faults. Use KOMTRAX telematics to track load frequency and fuel consumption trends. Early detection of coolant sodium intrusion or fuel dilution prevents catastrophic engine damage. Regular fluid sampling extends component life and reduces unexpected downtime.
Corrective & Common Repairs
Address frequent injector failures by checking fuel pressure and replacing worn nozzles. Inspect turbocharger shaft play and replace seals if oil leakage occurs. Replace worn track rollers and idlers to maintain proper undercarriage tension. Fix hydraulic hose leaks promptly to prevent contamination and pressure loss. Check electrical connectors for corrosion, especially in mining environments. Replace worn piston rings and liners if compression drops or oil consumption increases. Timely repairs prevent secondary damage to the powertrain.
Overhaul & Rebuild Points
Perform in-frame overhaul at 10,000 to 15,000 hours, replacing pistons, rings, liners, and bearings. Conduct out-of-frame overhaul for crankshaft and cylinder head work. Replace all gaskets and seals during rebuild. Inspect camshaft lobes and valve seats for wear. Rebuild the fuel injection pump if calibration data falls outside specifications. Overhaul the turbocharger and intercooler cores. Ensure proper torque sequences during reassembly to maintain engine integrity and performance.
Seasonal & Environment Servicing
In cold climates, use low-viscosity engine oil and ensure coolant freeze protection. Preheat the engine before starting in sub-zero temperatures. In dusty environments, check the air filter restriction indicator more frequently and clean the radiator fins daily. In high-temperature conditions, monitor coolant temperature and clean the oil cooler. Protect electrical components from moisture and salt corrosion. Adjust undercarriage tension for soft ground conditions. Regular environmental servicing ensures reliable operation in extreme conditions.
S6D140-1Z(S/N 17626-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07281-00197 | Clamp,(With Pre-Fuel Filter) | Fuel system service | Check fitment → |
| 600-311-7131 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 6128-81-7042 | Element Assembly, Air Cleaner | Air intake service | Check fitment → |
| 09637-02161 | Plate? Instruction,Air Cleaner (Double Element) | Air intake service | Check fitment → |
| 09637-30161 | Plate? Instruction,Air Cleaner (Single Element) | Air intake service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
S6D140-1Z(S/N 17626-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor failure | Broken sensor, wiring issue, or connector corrosion | Replace the speed sensor and verify the voltage at the pin connector |
| CA111 | Internal engine controller fault | ECM hardware failure | Replace or reprogram the ECM |
| CA441 | Battery voltage too low | Weak battery or charging system failure | Replace the alternator or battery; check the voltage regulator |
| CA442 | Battery voltage too high | Alternator overcharging or regulator failure | Replace the alternator or battery; check the voltage regulator |
| CA122 | Intake air pressure high voltage | Sensor malfunction or actual overpressure condition | Verify the intake pressure sensor and wiring |
| CA123 | Intake air pressure low voltage | Sensor short or airflow restriction | Check for a sensor short or an airflow restriction |
| CA153 | Intake air temperature sensor error (High) | Sensor failure or wiring issue | Replace or test the IAT sensor |
| CA154 | Intake air temperature sensor error (Low) | Sensor failure or wiring issue | Replace or test the IAT sensor |
| CA451 | Common rail pressure sensor feedback value too high | Malfunction in the rail sensor or actual overpressure condition | Diagnose the fuel rail pressure sensor or pump lines |
| CA452 | Common rail pressure sensor feedback value too low | Sensor malfunction or fuel system leak | Diagnose the fuel rail pressure sensor or pump lines |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
S6D140-1Z(S/N 17626-UP) attachments & work tools
Bulldozer Attachments
The Komatsu D155A-3 dozer (S/N 60001-Up) equipped with the S6D140-1Z engine (S/N 17626-Up) utilizes standard dozer blades. Factory configurations include straight and angle blade options appropriate for the machine's class.
Wheel Loader Attachments
The WA500-1L wheel loader (S/N A20854-Up) is the primary application for this engine series. It supports standard bucket configurations for earthmoving and material handling tasks typical of the 500-class loader.
Hydraulic System Notes
Komatsu equipment requires Komatsu Hydraulic Oil (HO) or equivalent specifications. Engine lubrication utilizes Komatsu Diesel Engine Oil (TO) or approved equivalents. Coolant systems use Super-coolant AF-NAC.
All S6D140-1Z(S/N 17626-UP) assemblies by section
Every catalogued assembly group for the Komatsu S6D140-1Z(S/N 17626-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Engine
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Air Cleaner
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Air Intake Manifold
| 01***75 | Bolt,(For Adjusting) | 11 |
| 01***35 | Bolt | 4 |
| 01***40 | Bolt | 5 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Air Vent
| 01***20 | Bolt | 1 |
| 01***16 | Washer,Radio Controlled Slag Handling | 1 |
| 07***15 | Gasket,(Hd325?Pc750?800?1800) (A5010) | 13 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Alternator (35a) (Inner Parts)
| 60***60 | Alternator A. (35a) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***60 | Pulley,Non Hardening | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Alternator (50a) (Inner Parts)
| 60***71 | Alternator A. (50a),(With Non Hardening Pulley) | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Washer | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Alternator Mounting (35a)
| 01***20 | Bolt,(With Auto Emergency Steering) | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***60 | Bolt, Tube To Oil Cooler | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Alternator Mounting (50a)
| 01***20 | Bolt,(With Auto Emergency Steering) | 3 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***60 | Bolt, Tube To Oil Cooler | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Cam Follower Cover
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 1 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 5 |
| 01***65 | Bolt,(Except Japan) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Camshaft And Cam Follower(#19972-)
| 04***25 | Key, Plain Woodruff | 1 |
| 04***12 | Ring, Retaining | 4 |
| 61***20 | Ball | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Cooling Fan
| 60***20 | Fan,(High Speed) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Cooling Fan (Reversible Type)(#20754-21390)
| 60***21 | Fan,Reversible (With After Cooler) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Cooling Fan (Reversible Type)(#21391-)
| 60***20 | Fan,Reversible | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Corrosion Resistor
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***45 | Bolt,(For Power Tilt Mech Angle) | 2 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Crank Pulley
| 01***85 | Screw | 6 |
| 01***45 | Washer,(For Travel Motor) (Not Show) | 6 |
| 04***24 | Pin,Dowel (For No.3 Housing) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Crankshaft
| 61***30 | Key Parallel | 1 |
| 62***00 | Bearing Assembly | 1 |
| 62***10 | Main Bearing Assembly | 7 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Cylinder Block (1/2)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***25 | Screw | 6 |
| 01***16 | Washer,(With Water Separator) | 6 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Cylinder Block (1/2) (For Scraper)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 2 |
| 01***25 | Screw | 6 |
| 01***16 | Washer,(With Water Separator) | 6 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Cylinder Block (2/2) (Blind Cover)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 7 |
| 01***20 | Bolt,(Without Rops Guard? Canopy) | 1 |
| 07***25 | O-Ring,Corrosion Resistor | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Cylinder Block (2/2) (For Scraper)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 7 |
| 07***25 | O-Ring,Corrosion Resistor | 1 |
| 07***15 | Plug,(For Without Air Compressor) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Cylinder Block Gasket Kit
| 01***12 | Washer,(F2320-63a2 -13 ) | 2 |
| 07***60 | O-Ring,(For Pc750?800?1800) (A2610) | 1 |
| 07***25 | O-Ring,Corrosion Resistor | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Cylinder Head Gasket Kit
| 02***75 | O-Ring,(For Japan) (K1) | 4 |
| 02***81 | O-Ring,Air Connector | 2 |
| 07***21 | O-Ring,Oil Cooler Pipe | 12 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Cylinder Head(#19972-)
| 01***20 | Bolt (M10-1.75x120) | 6 |
| 02***04 | Plug, Pipe | 6 |
| 04***20 | Pin,Dowel (Welded) | 2 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Damper
| 01***30 | Bolt,(Not Used With Emergency Str.) | 6 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 6 |
| 62***00 | Damper Ass'Y | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Ejector Piping
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 5 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Ejector Piping (For Short Exhaust Pipe)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 5 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Engine Mounting
| 62***10 | Support,Front | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Exhaust Manifold
| 01***55 | Screw | 2 |
| 01***00 | Bolt | 22 |
| 07***08 | Plug,(For W/O. Corrosion Resistor) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Fan Belt
| 04***72 | V-Belt Set,Fan Drive | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Fan Belt (For Scraper)
| 04***73 | V-Belt Set,(For Scraper) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Flywheel
| 61***51 | Gear, Ring | 1 |
| 62***50 | Bolt | 6 |
| 62***00 | Flywheel Ass'Y | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Flywheel Housing
| 01***45 | Bolt,(For Slag Handling) | 8 |
| 01***60 | Bolt, Hanger Bearing Mounting | 2 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 4 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Front Cover
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***10 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Front P.T.O.
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 5 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Front P.T.O. (1/2) (For Scraper)
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 5 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Front P.T.O. (1/2) (Without Front P.T.O.) (For Scraper)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 1 |
| 01***15 | Bolt,(With Air Conditioner Type) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Front P.T.O. (2/2) (For Scraper)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 1 |
| 07***85 | O-Ring,Transmission Case Mount | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Front P.T.O. (2/2) (Without Front P.T.O.) (For Scraper)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 1 |
| 07***85 | O-Ring,Transmission Case Mount | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Front P.T.O. (Without Front P.T.O.)
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 3 |
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 1 |
| 01***15 | Bolt,(With Air Conditioner Type) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Fuel Filter
| 01***40 | Bolt,(With Air Conditioner) | 1 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***35 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Fuel Injection Pump (Coupling) (Inner Parts)
| DK***00 | Coupling,Cross | 1 |
| DK***00 | Nut | 2 |
| DK***00 | Bolt | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Fuel Injection Pump (Feed Pump) (Inner Parts)
| DK***20 | Bolt, Joint | 1 |
| DK***00 | Valve,Check | 2 |
| DK***30 | Eye,Joint | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Fuel Injection Pump (Governor) (1/2) (Inner Parts)
| DK***00 | Gasket | 1 |
| DK***00 | Screw | 1 |
| DK***00 | Shim? 2.00mm,(High Altitude Spec.) | 0 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Fuel Injection Pump (Governor) (2/2) (Inner Parts)
| DK***00 | Gasket | 1 |
| DK***20 | Capsule,Spring | 1 |
| DK***00 | Nut,Cap | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Fuel Injection Pump (Pump) (1/2) (Inner Parts)
| 62***20 | Injection Pump A | 1 |
| DK***30 | Bearing,Roller | 2 |
| DK***00 | Coupling | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Fuel Injection Pump (Pump) (2/2) (Inner Parts)
| DK***00 | Shim? 0.875mm | 0 |
| DK***00 | Shim? 0.500mm | 0 |
| DK***00 | Shim? 1.575mm | 0 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Fuel Injection Pump Mounting
| 01***90 | Bolt,(For No?1 And No?3 Housing) | 4 |
| 01***16 | Washer,Radio Controlled Slag Handling | 4 |
| (6***0) | Injection Pump A.,(See Fig.A4010-B4d9) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Fuel Return
| 01***95 | Bolt,(For 2nd Travel Speed) (Op) | 1 |
| 01***16 | Washer,Radio Controlled Slag Handling | 1 |
| 04***10 | Clip,(For Mono Lever Steering) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Head Cover(#19972-)
| 01***55 | Screw | 18 |
| 62***11 | Cover,Rocker Arm Housing | 6 |
| 62***20 | Gasket, Rocker Lever Housing | 6 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Heat Shield
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 7 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Heater Switch Wiring
| 01***10 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***10 | Washer,(For 35a Alternator) | 2 |
| 08***14 | Clip,(Without Ripper Point Light) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Idler Gear(#17626-21390)
| 01***30 | Bolt,(Cold Terrain Spec.) | 6 |
| 61***60 | Pin, Dowel | 1 |
| 62***13 | Shaft | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Idler Gear(#21391-)
| 01***30 | Bolt,(Cold Terrain Spec.) | 6 |
| 61***60 | Pin, Dowel | 1 |
| 61***43 | Bolt | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Injection Bracket And Piping
| 01***25 | Bolt,(For Automatic) | 4 |
| 01***35 | Bolt | 4 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Injection Nozzle
| 01***20 | Bolt, Mount Main Relief Valve | 6 |
| 07***21 | O-Ring,Oil Cooler Pipe | 12 |
| 07***12 | Gasket,Mechanical Pump Piping | 10 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Injection Pump Drive
| 01***16 | Bolt,(For Slag Handling) | 3 |
| 01***19 | Nut | 1 |
| 01***16 | Washer,(For Shipping) | 3 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Injection Pump Lubricator
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 2 |
| 07***14 | Screw, Banjo Connector (M10) | 1 |
| 62***10 | Tube,Supply | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Injection Pump Safety Guard
| 01***10 | Bolt, Fan Mounting | 4 |
| 17***60 | Elbow | 1 |
| 62***70 | Cover,Safety | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Injection Pump Safety Guard (For Scraper)
| 01***10 | Bolt, Fan Mounting | 2 |
| 17***60 | Elbow | 1 |
| 62***80 | Cover,Safety | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Muffler
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 3 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Muffler (For Short Exhaust Pipe)
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 3 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Arabic)
| 04***50 | Screw | 4 |
| 09***91 | Plate? Name,(Limited Supply) (Arabic) | 1 |
| 09***61 | Plate? Instruction,Air Cleaner (Double Element) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Chinese)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***61 | Plate? Instruction,(Chinese) (Not Shown) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Czech)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***61 | Plate? Instruction,(Czechoslovaskian) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Name Plate And Caution Plate (English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) (English) | 1 |
| 09***61 | Plate? Instruction,Air Cleaner (Single Element) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Name Plate And Caution Plate (French-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) (French) | 1 |
| 09***62 | Plate? Instruction,Air Cleaner (Double Element) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Name Plate And Caution Plate (German-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) (German) | 1 |
| 09***61 | Plate? Instruction,(German-English) (Not Shown) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Greek-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***61 | Plate? Instruction,(Greek-English) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Indonesian-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***61 | Plate? Instruction,(Indonesian-English)(Not Shown | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Italian-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***61 | Plate? Instruction,(Italian-English) (Not Shown) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Persian)
| 04***50 | Screw | 4 |
| 09***91 | Plate? Name,(Limited Supply) (Persian) | 1 |
| 09***61 | Plate? Instruction,(Persian-English) (Not Shown) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Polish-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***62 | Plate? Instruction,Air Cleaner | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Portuguese-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***61 | Plate? Instruction,(Portuguese-English)(Not Shown | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Russian)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***62 | Plate? Instruction,(English-Russian) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Name Plate And Caution Plate (Spanish-English)
| 04***50 | Screw | 4 |
| 09***40 | Plate? Name,(Limited Supply) | 1 |
| 09***61 | Plate? Instruction,(Spanish-English) (Not Shown) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Nozzle Holder (Inner Parts)
| 62***31 | Connector | 1 |
| 62***00 | Nozzle Holder Ass'Y | 6 |
| 62***20 | Nozzle | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Oil Adapter
| 01***16 | Bolt,(For Slag Handling) | 3 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 5 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Oil Cooler
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 13 |
| 01***60 | Bolt, Mount Tube To Switch Pump | 2 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Oil Cooler (Cold Terrain Spec.)
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 13 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Oil Filter
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 7 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Oil Level Gauge
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 1 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Oil Level Gauge (Cold Terrain Spec.)
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 1 |
| 01***08 | Nut,(For Canvas Canopy?Head Guard) | 1 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Oil Pan And Suction Tube
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***30 | Bolt,(For France Noise Suppression) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 38 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Oil Pan And Suction Tube (Cold Terrain Spec.)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***30 | Bolt,(For France Noise Suppression) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 38 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Oil Pump
| 01***25 | Bolt,(Without Auto Priming System) | 4 |
| 01***30 | Bolt,Radio Controlled Slag Handling | 1 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Piston
| 02***13 | Pin, Dowel | 2 |
| 04***20 | Ring, Retaining | 12 |
| 62***41 | Metal Ass'Y | 6 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Rocker Arm And Housing(#19972-)
| 01***80 | Bolt (M12-2.00x80) | 6 |
| 01***80 | Bolt (M10-1.50x80) | 16 |
| 01***20 | Bolt (M12-1.75x120) | 12 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Spare Parts
| 04***72 | V-Belt Set,Fan Drive | 1 |
| 60***30 | Cartridge,Oil Filter | 1 |
| 60***31 | Cartridge, Oil Filter | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Spare Parts (For Scraper)
| 04***73 | V-Belt Set,(For Scraper) | 1 |
| 60***30 | Cartridge,Oil Filter | 1 |
| 60***31 | Cartridge, Oil Filter | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Starting Motor (11kw) (Inner Parts)
| 60***10 | Starting Motor Ass'Y,(11kw) | 1 |
| SD***X9 | Switch Ass'Y,Engage | 1 |
| SD***X0 | Bearing,Ball | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Starting Motor Mounting (11kw)
| 01***40 | Bolt,(With Center Guard) | 3 |
| 08***19 | Band,(Without Air Conditioner) | 1 |
| 08***10 | Connector, Clip | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Tension Pulley
| 01***30 | Bolt,Radio Controlled Slag Handling | 2 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 2 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Thermostat And Piping
| 01***50 | Bolt,(With Service Valve R.H.) | 2 |
| 01***70 | Screw | 2 |
| 01***65 | Screw | 4 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Turbocharger (Inner Parts)(#20754-)
| 01***16 | Bolt | 4 |
| 01***16 | Bolt | 8 |
| 04***08 | Pin, Dowel | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Turbocharger Mounting(#20754-)
| 61***90 | Nut, Mounting | 4 |
| 61***10 | Screw | 4 |
| 62***31 | Gasket, Turbocharger | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Turbocharger Oil Piping
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***35 | Bolt,(F4320-52a0 -5 ) | 3 |
| 01***90 | Bolt,(For No?1 And No?3 Housing) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Water Pump
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***80 | Bolt,(Not Shown) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Water Pump Gasket Kit
| 02***37 | O-Ring,(For Pc750?1800) (A5010) | 2 |
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
| 07***15 | O-Ring,(For Low Speed) (D40pf) | 1 |
Komatsu : S6d140-1z(S/N 17626-Up) : Engine : Water Separator
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 5 |
| 01***45 | Bolt, Divider Valve Mounting | 1 |
S6D140-1Z(S/N 17626-UP) serial number reference
The engine serial number plate is located on the left side of the engine block or on a metal plate affixed near the valve cover. The machine serial number (PIN) is typically stamped into the frame or riveted to the chassis; for dozers, check the front frame casting or the inside of the cab door pillar. Read the engine model code (S6D140-1Z) and the sequential serial number (17626-Up) directly from the plate to confirm fitment.
| Prefix | Identifies | Notes |
|---|---|---|
| D155A-3 | Crawler Dozer | S6D140-1Z engine fitted to D155A-3 dozers with equipment serial number 60001-Up. Engine serial number range 17626-Up. No specific model year provided in source; verify with dealer for production dates. |
Frequently asked questions
What type of engine is the S6D140-1Z?
It is a six-cylinder, turbocharged, aftercooled diesel engine used in Komatsu D155A-3 bulldozers.
What is the operating weight of the machine it powers?
The Komatsu D155A-3 bulldozer has an operating weight ranging from approximately 130,000 to 140,000 lbs, varies by configuration.
What engine replaced the S6D140-1Z?
The SA6D140E-2 series engine replaced the S6D140-1Z in later Komatsu dozer models.
What S6D140-1Z(S/N 17626-UP) owners discuss
What are the known powertrain and hydraulic behaviors associated with the Komatsu S6D140-1Z engine series?
The S6D140-1Z is a six-cylinder, turbocharged, aftercooled diesel engine with a displacement of approximately 14.0 liters (854 cubic inches). It utilizes a Bosch-style fuel injection system with injector pressures reaching 3,200 PSI. The engine is characterized by high alloy piston rings and hardened cylinder liners. Hydraulic systems in machines equipped with this engine are generally smooth and fuel-efficient, though early dash-6 generations experienced valve problems, particularly on PC150 and PC120 models. If a hydraulic pump fails, the engine is often not far behind in terms of wear, contributing to lower resale values for these units. The engine is designed to wear out complete machines simultaneously rather than individual components failing in isolation.
What undercarriage or wear patterns are typical for machines using the S6D140-1Z engine?
Machines powered by the S6D140-1Z, such as the D155A-3 dozer (S/N 60001-Up), are subject to significant wear on bushings, bearings, and track pads due to continuous load and dust exposure. Worn bushings lead to noise and vibration; worn bearings cause premature track failure. Track tension and undercarriage wear are critical maintenance areas. The machine's design philosophy often results in complete machine wear-out rather than isolated component failure, meaning undercarriage components degrade in tandem with powertrain wear. Regular inspection of track-chain condition and roller status is required to prevent pulling or drifting during travel.
What are the specific engine quirks and design differences of the S6D140-1Z compared to related Cummins units?
The S6D140-1Z features hardened liners and high alloy rings, contrasting with the soft liners and single-head design of related Cummins L10 units which used a PT fuel system with lower injection pressure (2,100 PSI). The Komatsu engine’s Bosch-style system operates at 3,200 PSI. The S6D140-1Z was used in US-bound machines because Komatsu did not certify its own engines for US EPA certifications in the late nineties, leading to a temporary shift to Cummins for those markets. Operators generally prefer the Komatsu engine over the Cummins units that developed slobbering piston ring problems around 4,000 hours. The S6D140-1Z is distinct from the S6D102E series and later S6D140-2 series, which have different serial ranges and component specifications.
What are the common electrical and sensor issues reported for this engine series?
Komatsu excavators and dozers with this engine series rely heavily on electronic control systems. A single faulty sensor or unstable power supply can trigger multiple warning signals. Owners report intermittent starting, dashboard failure, and machines that randomly shut down. Multiple fault codes often point to battery issues, poor grounds, or connector problems rather than engine mechanical failure. The oil diversion warning light may stay on for 5-10 minutes if non-OEM filters (such as Donaldson) are used; this may also be linked to oil change timing. Ensuring a stable power supply and clean electrical connections is critical to preventing these electronic glitches.
What should be checked when buying a used machine with the S6D140-1Z engine (S/N 17626-UP)?
When purchasing a used machine with the S6D140-1Z engine (S/N 17626-UP), verify the engine data plate on the left side of the engine block to confirm the serial number and model. Check hydraulic oil level and condition; weak hydraulics when hot indicate internal leakage in pumps, valves, or cylinders. Inspect the cooling package (radiator, hydraulic oil cooler, charge-air cooler) for packed debris between heat exchangers. Test the engine under load to ensure it does not lose power or drop RPM excessively when hydraulics are used. Check for air leaks in the fuel supply and intake hoses. Verify the condition of the undercarriage, including track tension and roller wear. Ensure the battery holds voltage under load and that all electrical grounds are clean. Confirm the exact serial range matches the S6D140-1Z specifications, as later models may use different engines like the SA6D140E-2.
What are the recommended fluid specifications for the S6D140-1Z engine and associated systems?
Use Komatsu Genuine Diesel Engine Oil meeting Komatsu Engineering Standards. For hydraulic systems, use Komatsu Hydraulic Oil HO or equivalent ISO VG46. For the final drive and swing gearbox, use Komatsu Powertrain Oil TO or equivalent SAE 10W or 30W depending on climate. Axle oil should be Komatsu Axle Oil AXO or equivalent SAE 80WZF. Coolant should be Komatsu Super Coolant AF-NAC. Avoid mixing different fluid types and ensure filters are OEM or approved equivalents to prevent warning light issues and maintain system integrity.
What safety-critical fixes or inspections are required for the S6D140-1Z engine?
Inspect the turbocharger and charge-air hoses for loose clamps or damage, as air leaks can cause power loss and overheating. Check the fuel system for water in the separator and air entering the supply lines. Verify the condition of the head gasket and lower gasket kit, as overheating or pressurized coolant expulsion may indicate deeper engine issues. Ensure the cooling system is filled with the correct coolant when cold. Have your dealer verify the exact serial number and engine model to ensure compatibility with service specifications and parts, as the S6D140-1Z (S/N 17626-UP) is distinct from later S6D140-2 and SA6D140E-2 engines.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific S6D140-1Z(S/N 17626-UP) part?
Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.