Komatsuengine(no series)
Komatsu S4D102E-1V(S/N 26200163-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S4D102E-1V is a 4-cylinder, water-cooled, turbocharged diesel engine belonging to the S4D102E-1 series. It is a compact power unit designed for mid-size construction machinery, typically found in WA120-1LC wheel loaders and similar compact equipment classes. The engine supports a weight range of 9,182 to 35,000 lb (4,165 to 15,876 kg) depending on the host machine configuration. Production years for this series span the early 2000s through the mid-2010s, serving as a predecessor to the S4D102E-2 series and later Tier 4 compliant variants. Configurations offered include standard industrial, marine, and generator set applications, with the S4D102E-1V specifically denoting a serial range starting from 26200163.
Across the S4D102E series generations, the primary changes involved emissions compliance updates, fuel injection system refinements, and turbocharger efficiency improvements to meet evolving environmental standards. The S4D102E-1V remains significant in the used and parts market because it powers a high-volume fleet of compact wheel loaders and industrial equipment that are now reaching major overhaul milestones. Its simple mechanical architecture and widespread use in the WA120 and similar compact lines ensure high parts availability and a robust aftermarket support network, making it a critical reference point for fleet managers managing aging compact equipment.
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 S4D102E-1V(S/N 26200163-UP) specifications
Engine
| Model | S4D102E-1 |
| Type | 4-cycle, water-cooled, direct-injection |
| Displacement | 3.9 liter (238 CID) |
| Cylinders | 4 |
| Bore | 102 mm (4.02 in) |
| Stroke | 120 mm (4.72 in) |
| Gross Power | 97-112 kW (130-150 hp) @ 2500 rpm |
| Torque | 280-300 Nm (207-221 lb.ft) @ 1500 rpm |
| Compression Ratio | 16.5:1 |
Weights
| Engine Weight | approx. 390 kg (860 lb) |
Dimensions
| Engine Length | approx. 790 mm (31 in) |
| Engine Width | approx. 711 mm (28 in) |
| Engine Height | approx. 894 mm (35 in) |
Performance
| Note | Machine-specific performance figures (travel speed, lift capacity, dig depth) are not documented for the engine-only specification in the provided sources. |
Service capacities (summary)
| Note | Specific fluid capacities (fuel, hydraulic, oil, coolant) are not documented for the engine-only specification in the provided sources. |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu S4D102E-1V(S/N 26200163-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 S4D102E-1V(S/N 26200163-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every 500-hour interval to monitor engine wear metals (iron, copper, lead) and contaminants (silicon, sodium). Check coolant SCA concentration at 500 hours to prevent liner cavitation. Monitor hydraulic oil particle count and viscosity at 1,000 hours to detect pump or valve wear. Track DEF levels and KDPF differential pressure if the host machine is Tier 4 compliant. Use KOMTRAX telematics to correlate load frequency with oil oxidation rates for optimized change intervals.
Corrective & Common Repairs
Address white smoke symptoms by inspecting fuel injection timing and injector nozzle spray patterns. Resolve excessive black smoke by cleaning or replacing the air filter element and checking turbocharger boost pressure. Fix sudden oil loss by inspecting the turbocharger shaft seals and oil pan gasket. Replace worn piston rings and cylinder liners if blue smoke indicates excessive blow-by. Repair hydraulic leaks by replacing O-rings on high-pressure lines and checking the hydraulic return filter for bypass.
Overhaul & Rebuild Points
Perform inframe overhaul at 10,000 hours or when compression drops below specification. Replace pistons, piston rings, and cylinder liners as a matched set. Inspect the crankshaft for journal wear and replace main and connecting rod bearings if clearance exceeds limits. Check camshaft lobe wear and replace tappets if clearance is excessive. Rebuild the fuel injection pump and calibrate injectors on a test bench. Replace the turbocharger if shaft play or bearing noise is detected.
Seasonal & Environment Servicing
In cold climates, use low-temperature grade engine oil and ensure the coolant mixture provides adequate freeze protection. Drain the fuel water separator daily to prevent ice formation in the fuel lines. In dusty environments, check the air filter restriction indicator more frequently and clean the radiator and oil cooler fins daily to prevent overheating. In high-humidity areas, monitor the hydraulic oil for water contamination and replace the hydraulic return filter more often. Store the machine in a dry environment to prevent corrosion on electrical components.
S4D102E-1V(S/N 26200163-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 6732-71-6111 | Filter, Fuel - Secondary | Fuel system service | Check fitment → |
| 09637-30163 | Plate? Instruction,Air Cleaner (Single Element) | Air intake service | Check fitment → |
| 6732-21-5530 | Cartridge, Engine Oil Filter | Lubrication service | Check fitment → |
| 6162-53-5430 | Packing,Oil Filter And Piping | Lubrication service | Check fitment → |
| 6162-53-5450 | Packing,Oil Filter And Piping | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
S4D102E-1V(S/N 26200163-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor and backup 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 or corruption | Replace or reprogram the ECM |
| CA122 | Intake air pressure sensor feedback voltage too high | Sensor malfunction or wiring issue | Verify the intake pressure sensor and wiring |
| CA123 | Intake air pressure sensor feedback voltage too low | Sensor short or airflow restriction | Check for a sensor short or an airflow restriction |
| 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 failure or low fuel pressure | Diagnose the fuel rail pressure sensor or pump lines |
| CA234 | Engine overspeed | Throttle calibration error, engine load cycle issue, or operator misuse | Verify throttle calibration, engine load cycle, or operator misuse |
| CA441 | Battery voltage too low | Alternator failure, battery failure, or voltage regulator issue | Replace the alternator or battery; check the voltage regulator |
| CA442 | Battery voltage too high | Alternator overcharging or voltage regulator failure | Replace the alternator or battery; check the voltage regulator |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
S4D102E-1V(S/N 26200163-UP) attachments & work tools
Bucket
Typical capacities for this class range from 0.68 m³ (0.89 yd³) for standard digging buckets to 1.0 m³ (1.31 yd³) for heavy-duty variants. Factory guarding options include side cutters and wear plates for high-abrasion applications.
Coupler System
The machine utilizes a hydraulic quick coupler system for rapid tool changes. Hydraulic lines are routed through the boom to supply pressure and return flow to the coupler mechanism.
Hydraulic Kit
Tools requiring auxiliary hydraulics, such as breakers or hammers, require a factory-installed hydraulic kit with pilot lines and relief valves. The arrangement supports single or double-acting tool configurations depending on the specific attachment selected.
Blade
Straight or semi-U dozer blades are available for earthmoving and grading tasks. Blade widths and capacities vary by configuration, with standard widths around 2.41 m (7 ft 11 in) for this engine class.
Ripper
Single-shank or multi-shank rippers are offered for breaking hard ground or rock. Mounting points are reinforced to handle high impact loads, with shank lengths varying by application depth requirements.
All S4D102E-1V(S/N 26200163-UP) assemblies by section
Every catalogued assembly group for the Komatsu S4D102E-1V(S/N 26200163-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Engine
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Air Intake Heater
| 67***10 | Gasket | 1 |
| 67***11 | Gasket,Air Intake Heater | 1 |
| 67***10 | Harness, Wiring | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Alternator (25a)
| (6***0) | Alternator A. (25a),(See Fig.A601p-02a5) | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Alternator (25a) (Inner Parts)
| 60***10 | Alternator A. (25a) | 1 |
| KD***57 | Bearing,Ball? Front | 1 |
| KD***60 | Pulley,Non Hardening | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Alternator (35a) (Inner Parts)(#26233152-)
| 60***10 | Alternator A. (35a),(See Fig.A601p-02a1) | 1 |
| ND***10 | Cover,Rear | 1 |
| ND***30 | Collar,Stud | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Alternator (35a)(#26233152-)
| (6***0) | Alternator A. (35a),(See Fig.A601p-02b0z) | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Alternator (60a) (Inner Parts)(#26212361-)
| 60***10 | Alternator A. (60a),(See Fig.A601p-02a2) | 1 |
| ND***80 | Screw | 4 |
| ND***30 | Collar,Stud | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Alternator (60a)(#26212361-)
| (6***0) | Alternator A. (60a),(See Fig.A9990-02a3) | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Alternator Support
| 01***30 | Bolt,(For Trimming Dozer) | 1 |
| 01***11 | Nut (Welded) | 1 |
| 01***23 | Washer,(With Car Heater) | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Alternator Support (For 60a And 35a Alternator)(#26212361-)
| 01***95 | Bolt (M10-1.50x95) | 1 |
| 01***16 | Washer,(For Shipping Parts) | 1 |
| 67***60 | Bolt, Mounting (M8-1.25x25) | 2 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Belt Tensioner (For 25a Alternator) (High Speed Fan Spec.)(#26254991-)
| 67***10 | Tensioner,Belt | 1 |
| 67***20 | Bolt (M10x1.50x70) | 1 |
| 67***20 | Capscrew, Flat Head (M8-1.25x25) | 2 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Belt Tensioner (For 25a Alternator)(#26244410-)
| 67***10 | Tensioner,Belt | 1 |
| 67***20 | Bolt (M10x1.50x70) | 1 |
| 67***70 | Belt | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Belt Tensioner (For 35a Alternator)(#26257320-)
| 67***10 | Tensioner,Belt | 1 |
| 67***20 | Bolt (M10x1.50x70) | 1 |
| 67***20 | Capscrew, Flat Head (M8-1.25x25) | 2 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Belt Tensioner (For 60a Alternator)(#26254991-)
| 67***10 | Tensioner,Belt | 1 |
| 67***20 | Bolt (M10x1.50x70) | 1 |
| 67***20 | Capscrew, Flat Head (M8-1.25x25) | 2 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Breather Hose(#26244410-26248427)
| 07***20 | Clamp, Spring Hose | 1 |
| 07***52 | Hose | 1 |
| 67***40 | Clip | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Breather Hose(#26248428-)
| 07***20 | Clamp, Spring Hose | 1 |
| 07***63 | Hose | 1 |
| 67***40 | Clip | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Camfollower Cover(#26226525-)
| 67***20 | Bolt, Mounting (M8-1.25x16) | 4 |
| 67***10 | Cover, Push Rod | 1 |
| 67***11 | Cover | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Camshaft
| 67***11 | Camshaft | 1 |
| 67***20 | Support, Camshaft Thrust | 1 |
| 67***31 | Gear, Camshaft | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Caution Plate (English) (Ordering Transferred Parts)(#26253588-)
| 09***63 | Plate? Instruction,Air Cleaner (Single Element) | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Caution Plate (English)(#26225776-)
| 67***11 | Plate? Name | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Caution Plate (English)(#26254398-)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Caution Plate (For Regulation Of Epa)(#26257320-)
| 67***70 | Plate,Name | 1 |
| 67***80 | Plate | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Caution Plate (Spanish)(#26254398-)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Ceramic Muffler Rerated Parts (Forwarded Individually Parts)(#26257282-)
| 61***80 | Hose | 1 |
| 61***10 | Monitor Ass'Y | 1 |
| 61***50 | Sensor,Exhaust Pressure | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Cooling Fan
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 4 |
| 01***35 | Bolt, Mount Bracket To Floor | 4 |
| 01***30 | Screw | 4 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Crank Pulley (Tunnel Spec.)(#26234454-)
| 61***60 | Boss | 4 |
| 67***10 | Pulley, Crankshaft | 1 |
| 67***20 | Bolt (M12x1.25x36) | 4 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Crankshaft
| 67***20 | Crankshaft Ass'Y | 1 |
| 67***50 | Gear, Crankshaft | 1 |
| 67***11 | Gear, Crankshaft | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Cylinder Block(#26221676-)
| 62***10 | Screw | 2 |
| 62***10 | Seal, O-Ring (M10-1.00) | 4 |
| 67***30 | Block Assembly, Cylinder | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Cylinder Head(#26238879-)
| 67***10 | Retainer, Exhaust Valve Spring | 8 |
| 67***10 | Head Ass'Y | 1 |
| 67***51 | Gasket, Cylinder Head | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Exhaust Connector Clamp
| 67***20 | Clamp,Turbocharger Outlet Pipe | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Exhaust Manifold And Air Connector(#26207667-)
| 07***08 | Plug,(Without Auto Priming System) | 1 |
| 67***10 | Plug, Pipe (1/2-14 Npt) | 2 |
| 67***60 | Bolt, Mounting (M8x1.25x25) | 6 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Fan Drive Pulley (High Speed Fan Spec.)(#26257320-)
| 01***30 | Bolt,(Water Separator Spec.) | 3 |
| 01***75 | Screw | 1 |
| 67***31 | Support Ass'Y | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Fan Drive Pulley(#26244410-)
| 01***30 | Bolt,(Water Separator Spec.) | 3 |
| 01***75 | Screw | 1 |
| 67***30 | Pulley, Fan | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Fan Pulley (With 25a Alternator)(#26226470-)
| 67***50 | Pulley, Accessory Drive | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Flywheel Housing Plug (With Revolution Sensor)
| 01***25 | Bolt - Relay Mounting | 1 |
| 01***20 | Bolt - Mount Risers To Cab Floor | 1 |
| 02***13 | Plug | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Flywheel Housing(#26244410-)
| 02***13 | Plug | 1 |
| 67***40 | Cover, Rear | 1 |
| 67***30 | Plate, Cover | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Flywheel(#26212900-)
| 67***20 | Washer, Plain (M12) | 8 |
| 67***30 | Bolt (M12x1.25x32) | 8 |
| 67***80 | Gear, Flywheel Ring | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Front Cover(#26238939-)
| 67***11 | Gasket | 1 |
| 67***40 | Pin, Timing | 1 |
| 67***50 | Ring, Retaining | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Front Gear Train Cover(#26244410-)
| 01***30 | Bolt, Mounting - Front Hand Rails | 2 |
| 67***10 | Cover | 1 |
| 67***80 | Gasket, Accessory Drive Cover | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Fuel Filter
| 67***10 | Cartridge,Fuel | 1 |
| 67***11 | Filter, Fuel - Secondary | 1 |
| 67***20 | Head | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Fuel Filter Mounting And Piping(#26244410-)
| 01***20 | Bolt,See Fig. K4010-11a0 | 1 |
| 01***14 | Bolt,(W/Joy Stick Str.)(W/O Heater) | 1 |
| 01***25 | Bolt - Relay Mounting | 2 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Fuel Injection Pump (Feed Pump) (Inner Parts)(#24244410-)
| DK***20 | Bolt, Joint | 1 |
| DK***60 | Feed Pump Ass'Y | 1 |
| DK***00 | Valve,Check | 2 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Fuel Injection Pump (Governor) (1/2) (Inner Parts)(#24244410-)
| DK***00 | Shim? 2.00mm,(High Altitude Spec.) | 0 |
| DK***00 | Gasket | 1 |
| DK***40 | Gasket | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Fuel Injection Pump (Governor) (2/2) (Inner Parts)(#24244410-)
| DK***00 | Gasket | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Fuel Injection Pump (Pump) (1/2) (Inner Parts)(#26244410-)
| 67***61 | Injection Pump Ass'Y | 1 |
| DK***30 | Bearing | 0 |
| DK***20 | Housing | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Fuel Injection Pump (Pump) (2/2) (Inner Parts)(#26244410-)
| DK***40 | Shim? 0.50mm, Shim, 0.50mm; Was Dk029311-0040 | 0 |
| DK***90 | Shim? 0.25mm, Shim, 0.25mm; Was Dk029311-0590 | 0 |
| DK***00 | Sleeve,Control | 4 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Fuel Injection Pump And Oil Piping(#26244410-)
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 2 |
| 07***10 | Screw, Banjo Connector (M10-1.25x20) | 1 |
| 62***10 | Seal, O-Ring (M10-1.00) | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Fuel Injection Pump Mounting
| 01***14 | Bolt - Fuel Sensor Mounting | 2 |
| 01***11 | Nut (M14-1.50 Thd), Nut; Was 01582-01411 | 1 |
| 61***61 | Washer, Plain (14mm) | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Fuel Inlet And Outlet Joint(#26200415-)
| 61***50 | Connector, Banjo | 1 |
| 61***50 | Joint | 1 |
| 67***40 | Cap,(For Shipping) | 2 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Fuel System Accessory
| 67***60 | Bolt, Mounting (M8-1.25x25) | 1 |
| 67***20 | Bolt, Flange (M8-1.25x20) | 1 |
| 67***10 | Gasket, Cover Plate | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Head Cover(#26203667-)
| 67***30 | Bolt (M8x1.25x25) | 4 |
| 67***50 | Washer, Plain (3/8 Inch) | 4 |
| 67***81 | Gasket, Valve Cover | 4 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Heater Switch And Air Cleaner (Ordering Transferred)(#26244410-)
| 60***90 | Valve,Dust | 1 |
| 60***10 | Cover Ass'Y,Seal | 1 |
| 60***70 | O-Ring | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Heater Switch(#26224558-26257281)
| 60***70 | Switch,Air Intake Heater | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Injection Nozzle(#26237766-)
| 67***00 | Nozzle Holder Ass'Y | 1 |
| 67***20 | Injector | 1 |
| 67***30 | Nozzle | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Injection Piping(#26225776-)
| 04***08 | Clip | 1 |
| 61***80 | Spacer | 2 |
| 67***20 | Bolt, Mounting (M8-1.25x16) | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Main Power Take Off
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 6 |
| 01***32 | Washer,(Not Used With Emergency Str.) | 6 |
| 20***60 | Coupling | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Muffler (Ceramic Type)(#26257282-)
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Muffler(#26244410-)
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 4 |
| 01***35 | Bolt,R.H. (For Add. Air Compressor) | 2 |
| 01***06 | Nut | 4 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Oil Cooler Cover(#26244410-)
| 67***20 | O-Ring,Oil Pressure Plug | 1 |
| 67***32 | Gasket,Oil Pressure Plug | 1 |
| 67***10 | Core, Cooler | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Oil Drain Valve And Plate(#26244410-)
| 01***12 | Bolt - Front Cover Mounting | 3 |
| 01***08 | Washer | 3 |
| 07***16 | Gasket,(For Pc750-6) (See Fig.A2110) | 2 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Oil Filler Cap(#26200163-26202772)
| 61***10 | Cap, Oil Filler | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Oil Filler(#26244410-)
| 01***12 | Bolt,(With Speedometer) | 2 |
| 01***30 | Bolt, Mounting - Front Hand Rails | 2 |
| 07***89 | Clamp,(D31s) | 2 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Oil Filter And Piping(#26244410-)
| 01***20 | Bolt,(Forwarded Individually Parts) | 1 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 1 |
| 01***65 | Bolt, Mount Tube To Divider Valve | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Oil Gauge(#26244410-)
| 01***12 | Bolt,(With Speedometer) | 1 |
| 04***08 | Clip | 1 |
| 67***90 | Guide | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Oil Pan And Suction Tube(#26244410-)
| 09***50 | Liquid Gasket, Lg-7, 150g | 0 |
| 67***10 | Pan,Oil | 1 |
| 67***60 | Bolt, Mounting (M8-1.25x25) | 2 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Oil Pan Bolt
| 67***10 | Bolt, Mounting (M8-1.25 X 25) | 28 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Oil Piping Elbow(#26244410-)
| 67***40 | Elbow | 1 |
| 67***50 | Elbow | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Oil Pressure Switch(#26215461-)
| 08***05 | Switch,Engine Oil Pressure | 1 |
| 62***10 | Seal, O-Ring (M10-1.00) | 1 |
| 67***70 | Adaptor | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Oil Pump(#26200163-26276328)
| 67***11 | Pump, Lubricating Oil | 1 |
| 67***20 | Bolt (M8x1.25x30) | 4 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Oil Pump(#26276329-)
| 67***12 | Pump, Lubricating Oil | 1 |
| 67***20 | Bolt (M8x1.25x30) | 4 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Piston
| 67***00 | Piston Ring Ass'Y | 4 |
| 67***10 | Pin, Piston | 4 |
| 67***20 | Ring, Retaining | 8 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Rear Hanger(#26244410-)
| 01***50 | Bolt,(Europe Spec.) | 2 |
| 67***10 | Bracket | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Repair Parts (1/4) (Cylinder Head)
| 67***51 | Gasket, Cylinder Head | 1 |
| 67***51 | Gasket, Cylinder Head | 1 |
| 67***10 | Guide, Valve Stem - Intake/Exhaust (Thin Wall) | 8 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Repair Parts (2/4) (Cylinder Block)
| 67***10 | Bushing, Oversize (No. 1 Bore) | 1 |
| 67***20 | Bushing, Oversize (No. 2-5 Bore) | 1 |
| 67***10 | Sleeve, Salvage - Std Bore | 4 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Repair Parts (3/4) (Crankshaft)
| 67***00 | Main Metal Ass'Y | 4 |
| 67***00 | Main Metal Ass'Y | 4 |
| 67***00 | Main Metal Ass'Y | 4 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Repair Parts (4/4) (Piston)
| 67***00 | Piston Ring Ass'Y | 4 |
| 67***00 | Piston Ring Ass'Y | 4 |
| 67***20 | Piston? 0.5mm | 4 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Rocker Arm
| 67***70 | Screw, Slotted Set (3/8-24x1 1/2 Inch) | 2 |
| 67***40 | Bolt | 4 |
| 67***10 | Rod, Push | 8 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Spare Parts (For 25a And 35a Alternator)(#26254126-26255319)
| 67***81 | Gasket, Valve Cover | 4 |
| 67***10 | Gasket,Camfollower Cover Bolt | 4 |
| 67***40 | Cartridge,Engine Oil | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Spare Parts (For 25a And 35a Alternator)(#26257320-)
| 67***81 | Gasket, Valve Cover | 4 |
| 67***10 | Gasket,Camfollower Cover Bolt | 4 |
| 67***40 | Cartridge,Engine Oil | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Spare Parts (For 60a Alternator)(#26254126-26255319)
| 67***81 | Gasket, Valve Cover | 4 |
| 67***10 | Gasket,Camfollower Cover Bolt | 4 |
| 67***40 | Cartridge,Engine Oil | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Spare Parts (For 60a Alternator)(#26257320-)
| 67***81 | Gasket, Valve Cover | 4 |
| 67***10 | Gasket,Camfollower Cover Bolt | 4 |
| 67***40 | Cartridge,Engine Oil | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Starting Motor (4.5kw)
| (6***0) | Starting Motor Ass'Y,(4.5kw) (See Fig.A621p-02a0) | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Starting Motor (4.5kw) (Inner Parts)
| 60***10 | Starting Motor Ass'Y | 1 |
| KD***10 | Spring | 1 |
| KD***40 | Pinion | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Starting Motor Mounting(#26236432-)
| 01***35 | Bolt, Mount Bracket To Floor | 2 |
| 67***11 | Gasket,Starter | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Stop Solenoide(#26200278-)
| 01***20 | Bolt,See Fig. K4010-11a0 | 2 |
| 01***70 | Screw | 2 |
| 01***35 | Screw | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Tachometer Drive Cover
| 67***90 | Cover, Mechanical Tach Drive | 1 |
| 67***20 | Seal, Rectangular Ring | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Tappet
| 67***12 | Tappet, Valve | 8 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Thermostat Housing(#26244410-)
| 67***40 | Bolt, (M8x1.25x35) | 1 |
| 67***70 | Coupling, Plain Hose | 1 |
| 67***80 | Bolt (M8-1.25x70) | 2 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Thermostat(#26200163-26281220)
| 67***20 | Thermostat | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Thermostat(#26281221-26295762)
| 67***71 | Thermostat | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Thermostat(#26295763-)
| 67***71 | Thermostat | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Turbocharger Mounting(#26233152-)
| 67***90 | Gasket | 1 |
| 67***52 | Kit,Turbocharger | 1 |
| 67***10 | Stud ((M10x1.50 (Both Ends) X42)) | 4 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Turbocharger Oil Piping(#26244410-26247703)
| 67***20 | Hose | 1 |
| 67***80 | Connector, Male | 2 |
| 67***30 | O-Ring,Turbocharger Drain | 2 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Turbocharger Oil Piping(#26247704-)
| 01***30 | Bolt,(Water Separator Spec.) | 2 |
| 07***12 | Gasket,(Without Air Compressor Type) (K1) | 2 |
| 62***90 | Gasket,Turbocharger Oil Drain | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Under Plate
| 67***50 | Plate, Cylinder Block Stiffener | 1 |
| (0***0) | Liquid Gasket, Lg-7, 150g | 0 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Water Connector
| 67***60 | Connection, Water Inlet | 1 |
| 67***10 | Connector | 1 |
| 67***20 | Bolt (M10-1.50x75) | 3 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Water Connector Plug
| 67***10 | Plug, Pipe (1/2-14 Npt) | 2 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Water Pump(#26202771-26274660)
| 67***60 | Bolt (M8x1.25x22) | 2 |
| 67***00 | Water Pump Ass'Y | 1 |
| 67***01 | Water Pump Ass'Y | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Water Pump(#26274661-)
| 67***60 | Bolt (M8x1.25x22) | 2 |
| 67***02 | Water Pump Ass'Y | 1 |
| 67***20 | Seal, Rectangular Ring | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Water Separator (Forwarded Individually Parts)(#26257282-)
| 07***12 | Gasket,Mechanical Pump Piping | 1 |
| 60***90 | O-Ring | 1 |
| 60***90 | Plug,Drain | 1 |
Komatsu : S4d102e-1v(S/N 26200163-Up) : Engine : Water Valve And Water Temperature Sensor(#26200415-)
| 01***16 | Bolt, Mount Solenoid Valve | 1 |
| 01***16 | Screw | 1 |
| 08***10 | Clip,(Without Ripper) | 1 |
S4D102E-1V(S/N 26200163-UP) serial number reference
The PIN plate is located on the right-hand side of the cab on the lower frame, typically just behind the front idler or beneath the operator's window. The prefix is the first six digits of the serial number stamped on this plate, identifying the specific engine build range.
| Prefix | Identifies | Notes |
|---|---|---|
| 26200163 | S4D102E-1V | Serial range 26200163-UP. Source: DK Engine Parts equipment guide and published references catalog listing. Single-source confirmation for this specific variant prefix; verify with dealer. |
Frequently asked questions
What type of engine is the Komatsu S4D102E-1V?
It is a 4-cylinder, water-cooled, turbocharged diesel engine from the S4D102E-1 series, designed for compact construction equipment and industrial applications.
What is the operating weight range of machines powered by this engine?
Operating weight varies by configuration and host machine, typically ranging from 9,182 to 35,000 lb (4,165 to 15,876 kg).
What engine replaced the S4D102E-1 series?
The S4D102E-2 series and later Tier 4 compliant variants replaced the S4D102E-1 series to meet updated emissions standards.
What S4D102E-1V(S/N 26200163-UP) owners discuss
What are the known powertrain and hydraulic behaviors for the Komatsu S4D102E-1 series?
The engine is a 4-cylinder, 4-stroke, water-cooled, turbocharged diesel. It typically produces 102 horsepower (76 kW) at 2,100 rpm. The hydraulic system relies on a main pump that supplies flow to the boom, arm, bucket, swing, and travel circuits. A common diagnostic pattern is that if all hydraulic functions become slow simultaneously, the issue is likely shared (hydraulic oil level, filters, or engine RPM) rather than a single cylinder failure. If only one function is slow, the main pump is less likely to be the cause. Hydraulics may work normally when cold but become weak when hot due to decreased oil viscosity revealing internal leakage in pumps, valves, or motors. Engine power loss under load is often linked to air intake restrictions, fuel filter clogging, or turbocharger charge-air hose leaks rather than internal engine failure. The engine uses Komatsu EO or TO hydraulic oil specifications for the system and Komatsu AXO or HO engine oil for lubrication. Have your dealer verify specific fluid capacities and pressure settings for the exact machine configuration.
What undercarriage or wear patterns are typical for machines using this engine series?
Machines equipped with this engine class often operate in dusty or debris-heavy environments, leading to rapid clogging of the cooling package (radiator, hydraulic oil cooler, charge-air cooler) between heat exchangers. Undercarriage wear is accelerated by mud or debris packed into track assemblies, which increases mechanical resistance and causes uneven travel speeds. Track tension should be checked regularly, as repeated loosening is a common symptom of worn adjusters or excessive component wear. Final drives may produce noise if oil levels are low or contaminated. The machine may pull to one side during travel if track tension, roller condition, or chain wear differs between sides. Testing travel in both forward and reverse directions helps isolate hydraulic final-drive issues from mechanical track binding.
What are the common engine quirks per the S4D102E-1 series?
The S4D102E-1 series is a 102-series diesel engine. It features a trochoid oil pump and a turbocharger. Common quirks include the potential for white smoke generation if the cooling system is compromised or if there are fuel injection timing issues. A decrease in output or abnormal sound may indicate excessive exhaust smoke or sudden oil decrease. The engine requires regular inspection of rotor play and rotation in the oil pump. Cooling system integrity is critical; if coolant is expelled or the system becomes highly pressurized shortly after a cold start, deeper engine diagnosis is required. The engine relies on a specific fuel injection pump and injectors that require precise timing adjustments.
What are the common electrical or sensor issues associated with this machine type?
Komatsu excavators using this engine class rely heavily on electronic control systems. A single faulty sensor or unstable power supply can trigger multiple warning signals. Owners often report intermittent starting, dashboard failure, or machines that randomly shut down. Multiple fault codes may indicate battery issues, poor grounds, or connector problems. If the engine cranks but will not start, check for air entering the fuel supply, fuel quality, and recent filter replacements. If the engine does not crank, check the battery state of charge, terminals, engine and chassis grounds, main starter cable, and starter relay. A battery may show acceptable voltage until the starter is loaded; perform a load and voltage-drop test if voltage collapses during starting.
What should be checked when buying a used machine with the S4D102E-1 engine (S/N 26200163-UP)?
When evaluating a used machine with this engine serial range, check the following: 1. Engine performance: Verify net horsepower and fuel consumption under load. Look for signs of excessive smoke, overheating, or power loss. 2. Hydraulic system: Test all functions (boom, arm, bucket, swing, travel) both cold and hot. Weakness when hot indicates internal leakage. 3. Cooling package: Inspect the radiator, hydraulic oil cooler, and charge-air cooler for clogging between heat exchangers. 4. Undercarriage: Check track tension, roller condition, and chain wear. Look for mud or debris packed into the tracks. 5. Electrical system: Check for intermittent starting, dashboard failures, or random shutdowns. Verify battery health and ground connections. 6. Fluids: Check for correct Komatsu EO/TO hydraulic oil and Komatsu AXO/HO engine oil. Look for signs of contamination or incorrect fluid usage. 7. Serial range verification: Confirm the serial number matches the S/N 26200163-UP range to ensure accurate specification lookup.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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