Komatsuengine(no series)
Komatsu S4D102E-1N-L(S/N 26200163-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S4D102E-1N-L is a 4-cylinder industrial diesel engine belonging to the S4D102E-1 series, designed for mid-size construction equipment. It powers machines such as the WA150-1 wheel loader and PC100-6 excavator, with production spanning the 1990s through the 2000s. The engine is part of the 102 series lineage, which includes the 4D102E-1 and 6D102E-1 variants. It is typically found in machines with operating weights ranging from 10 to 15 tons. The S4D102E-1N-L configuration succeeded earlier 102 series engines and was later replaced by the SAA4D102E-2 series to meet evolving emissions standards.
Across the S4D102E-1 generation, Komatsu refined fuel injection timing and turbocharger integration to improve thermal efficiency and reduce smoke. The S4D102E-1N-L variant specifically addresses regional emissions requirements for this serial range. In the used and parts market, this engine remains critical because it is widely installed in high-volume PC100 and WA150 models. Its simple mechanical architecture and shared components with the 4D102E-1 make it a cost-effective powerplant for fleet maintenance, ensuring long-term parts availability and 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 S4D102E-1N-L(S/N 26200163-UP) specifications
Engine
| Model | S4D102E-1N-L |
| Series | S4D102E-1 |
| Cylinders | 4 |
| Emissions Tier | Not documented for this exact serial range — verify with your dealer |
| Gross/Net Power | Not documented for this exact serial range — verify with your dealer |
| Displacement | 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 |
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 S4D102E-1N-L(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-1N-L(S/N 26200163-UP) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every 500-hour interval to monitor wear metals and contamination. Check coolant SCA concentration at 500 hours to prevent cavitation in the S4D102E-1N-L cylinder block. Inspect the turbocharger rotor play and shaft clearance at 1000 hours to detect early bearing wear. Monitor hydraulic oil particle count to protect the high-pressure injection pump. Track engine oil viscosity and fuel dilution to maintain lubrication integrity under heavy load.
Corrective & Common Repairs
Address oil pressure switch leaks common in the S4D102E-1N-L after extended service life. Replace worn piston rings and cylinder liners if compression drops or oil consumption increases. Inspect the fuel injection pump for internal wear if power loss occurs. Check the turbocharger seals for exhaust smoke and oil leakage. Replace worn camshaft bearings if abnormal noise develops. Verify injector nozzle spray patterns to ensure proper combustion.
Overhaul & Rebuild Points
Perform an inframe overhaul at 10,000 hours or when compression falls below specification. Replace piston rings, liners, and bearings during the rebuild. Inspect the crankshaft for journal wear and taper. Check the cylinder head for cracks and warpage. Replace all gaskets and seals during the S4D102E-1N-L engine assembly. Re-torque cylinder head bolts to factory specification after initial operation.
Seasonal & Environment Servicing
In cold climates, use low-viscosity engine oil and ensure the cooling system is protected against freezing. Check the battery charge and cable integrity in extreme temperatures. In dusty environments, inspect the air filter restriction indicator more frequently and clean the radiator fins daily. Monitor the fuel water separator for condensation in humid conditions. Adjust valve clearances if performance changes due to thermal expansion.
S4D102E-1N-L(S/N 26200163-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 6732-71-6111 | Filter, Fuel - Secondary | Fuel system service | Check fitment → |
| 6732-21-5530 | Cartridge, Engine Oil Filter | Lubrication service | Check fitment → |
| 6736-61-5170 | Head, Lube Oil Filter | Lubrication service | Check fitment → |
| 600-181-6050 | Element Assembly, Complete | Scheduled service item | Check fitment → |
| 600-181-6540 | Element Assembly, Primary | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
S4D102E-1N-L(S/N 26200163-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| E10 | Engine controller power failure or engine control drive system circuit malfunction. | Faulty ECM power connections, blown fuses, or ground wire issues. | Inspect ECM power connections, fuses, and ground wires. |
| E11 | Engine control system failure resulting in reduced output power to protect the engine. | Overheating coolant, low oil pressure, or clogged air filter. | Check coolant temperature, oil pressure, and air filter condition. |
| CA111 | Engine controller (ECM) critical internal fault. | Internal ECM hardware failure or corruption. | Replace or reprogram the ECM. |
| CA115 | Engine speed sensor (Ne) and backup speed sensor (Bkup) failure. | Broken sensor, wiring issue, or connector corrosion. | Replace the speed sensor and verify voltage at the pin connector. |
| CA122 | Intake air pressure sensor feedback voltage is too high. | Sensor malfunction or wiring short to power. | Verify the intake pressure sensor and wiring integrity. |
| CA123 | Intake air pressure sensor feedback voltage is too low. | Sensor short to ground or airflow restriction. | Check for a sensor short or an airflow restriction. |
| CA441 | Battery voltage is too low. | Weak battery, failing alternator, or loose connections. | Replace the alternator or battery; check the voltage regulator. |
| CA451 | Common rail pressure sensor feedback value is too high. | Malfunctioning rail pressure sensor or actual overpressure condition. | Diagnose the fuel rail pressure sensor or pump lines. |
| B@BCNS | Engine coolant overheating. | Blocked radiator fins, broken fan belt, or low coolant level. | Check radiator fins, fan belt, and coolant level. |
| B@HANS | Hydraulic oil overheating. | Dirty hydraulic filter, low oil level, or cooler fan failure. | Change hydraulic filter and oil; check cooler fan operation. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
S4D102E-1N-L(S/N 26200163-UP) attachments & work tools
Wheel Loader Attachments
The Komatsu WA150-1 and WA150-1A wheel loaders (S/N 10001-Up) utilize the S4D102E-1N-L engine for serials 26200163-Up. Typical work tools include standard buckets ranging from 1.5 to 2.0 cubic meters, specialized rock buckets, and wood handling grapples. Coupler systems are generally fixed-pin or quick-attach variants compatible with the WA150 class boom geometry. Hydraulic kit arrangements require auxiliary lines for grapple or tilt functions, often sourced from the main pump via remote valves.
Dozer Attachments
The S4D102E-1N-L engine is associated with the D31S-20E and D31P-20 tracked dozers. Standard work tools include straight blade (SD) and semi-U (SU) dozer blades, typically sized for 2.0 to 2.5 cubic meter capacities. Ripper configurations vary by frame, with single or multi-shank ripper options available. Factory guarding often includes front blade wear strips and undercarriage guards specific to the D31 series chassis.
Excavator Attachments
The S4D102E-1N-L engine powers the PC100-6 and PC130-6 excavators. Standard digging buckets range from 0.4 to 0.6 cubic meters, with heavy-duty rock buckets and trenching buckets available for specific ground conditions. Coupler systems include fixed pins and quick-attach mechanisms compatible with the PC100/130 boom family. Hydraulic arrangements for breakers or hammers require high-flow auxiliary circuits and specific valve configurations.
Wheel Loader Attachments (WA180 Class)
The WA180-1 and WA180-1LC wheel loaders use the S6D95L-1B or S6D95L-1M engines, not the S4D102E-1N-L. Therefore, no direct attachment data is verified for the S4D102E-1N-L in this specific size class. Bucket capacities for the WA180 class typically range from 2.0 to 2.5 cubic meters. This category is excluded from verified data due to engine mismatch.
All S4D102E-1N-L(S/N 26200163-UP) assemblies by section
Every catalogued assembly group for the Komatsu S4D102E-1N-L(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-1n-L(S/N 26200163-Up) : Engine : Additional Pulley (Air Conditioner Pulley)(#26200912-)
| 01***90 | Bolt,(For Large Fan) | 4 |
| 67***11 | Spacer | 1 |
| 67***10 | Pulley | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Air Cleaner (For Air Intake Extension)(#26200912-)
| 01***85 | Screw | 2 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 1 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 3 |
Komatsu : S4d102e-1n-L(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-1n-L(S/N 26200163-Up) : Engine : Alternator (35a Shield) (Inner Parts)(#26239445-)
| 60***11 | Alternator A. (35a) | 1 |
| KD***70 | Bushing,Insulate | 1 |
| KD***50 | Regulator Ass'Y | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Alternator (35a Shield)(#26239445-)
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Alternator (50a) (Inner Parts)(#26240595-)
| 60***10 | Alternator A. (50a) | 1 |
| KD***70 | Bushing,Insulate | 2 |
| KD***40 | Bushing,Insulate | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Alternator (50a)(#26240595-)
| (6***0) | Alternator A. (50a),(See Fig.A601p-02a4z) | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Alternator Support (For 35a? 50a Alternator)(#26200912-)
| 01***30 | Bolt,(For Trimming Dozer) | 1 |
| 01***10 | Nut,(Without Air Conditioner) | 1 |
| 01***23 | Washer,(With Car Heater) | 3 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Belt Tensioner (Std And Strockbreeing Spec.) (For 35a?50a Alternator)(#26226525-)
| 67***41 | Tensioner, Alternator Belt | 1 |
| 67***30 | Tensioner, Alternator Belt | 1 |
| 67***20 | Bolt (M10x1.50x70) | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Boost Tube(#26239445-)
| 07***12 | Gasket,Injection Pump Piping | 5 |
| 07***67 | Clamp, Hose | 2 |
| 62***30 | Banjo Fitting | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Breather Hose(#26206198-)
| 07***20 | Clamp, Spring Hose | 1 |
| 07***65 | Hose | 1 |
Komatsu : S4d102e-1n-L(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-1n-L(S/N 26200163-Up) : Engine : Camshaft
| 67***11 | Camshaft | 1 |
| 67***20 | Support, Camshaft Thrust | 1 |
| 67***31 | Gear, Camshaft | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Caution Plate (English)(#26244848-)
| 67***11 | Plate? Name | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Caution Plate (English)(#26254398-)
| 09***08 | Plate? Instruction,Air Cleaner | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Cooling Fan(#26200912-)
| 01***35 | Bolt, Mount Bracket To Floor | 4 |
| 01***45 | Bolt, Bracket Mounting | 4 |
| 01***35 | Bolt | 6 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Corrosion Resistor(#26259791-)
| 60***91 | Cartridge, Corrosion Resistor | 1 |
| 60***10 | Head | 1 |
| 60***20 | Valve Assembly | 2 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Crank Pulley
| 67***10 | Pulley, Crankshaft | 1 |
| 67***20 | Bolt (M12x1.25x36) | 4 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Crankshaft
| 67***20 | Crankshaft Ass'Y | 1 |
| 67***50 | Gear, Crankshaft | 1 |
| 67***11 | Gear, Crankshaft | 1 |
Komatsu : S4d102e-1n-L(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-1n-L(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-1n-L(S/N 26200163-Up) : Engine : Exhaust Connector Clamp
| 67***20 | Clamp,Turbocharger Outlet Pipe | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Exhaust Manifold And Air Connector(#26217090-)
| 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-1n-L(S/N 26200163-Up) : Engine : Fan Drive Pulley (Std And Stockbreeing Spec.)(#26226525-26279942)
| 67***30 | Bearing,Roller | 1 |
| 67***30 | Bolt, Hex Cap (M8-1.25x30) | 2 |
| 67***70 | Bolt, Mounting (M8-1.25x40) | 2 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Fan Drive Pulley (Std And Stockbreeing Spec.)(#26279943-)
| 06***05 | Bearing,Ball | 1 |
| 06***07 | Bearing,Ball | 1 |
| 07***16 | Plug,Expansion | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Flywheel Housing Plug
| 01***25 | Bolt - Relay Mounting | 1 |
| 02***13 | Plug | 1 |
| 07***16 | Gasket,(For Pc750-6) (See Fig.A2110) | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Flywheel Housing Plug(#26246658-26266120)
| 07***16 | Gasket,(For Pc750-6) (See Fig.A2110) | 1 |
| 61***90 | Spacer | 1 |
| 62***80 | Plug,Drain | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Flywheel Housing(#26253813-)
| 02***13 | Plug | 1 |
| 67***40 | Cover, Rear | 1 |
| 67***30 | Plate, Cover | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Flywheel(#26213471-)
| 67***20 | Washer, Plain (M12) | 8 |
| 67***30 | Bolt (M12x1.25x32) | 8 |
| 67***80 | Gear, Flywheel Ring | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Front Cover(#26238939-)
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Front Gear Train Cover(#26200163-26264932)
| 67***80 | Gasket, Accessory Drive Cover | 1 |
| 67***10 | Plate, Accessory Drive Cover | 1 |
| 67***30 | Bolt, Flange Head (M12-1.75x25) | 2 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Front Gear Train Cover(#26264933-)
| 07***10 | O-Ring,(F4320-67a0 -4 ) | 1 |
| 67***30 | Cover | 1 |
| 67***30 | Bolt, Flange Head (M12-1.75x25) | 2 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Front Hanger(#26200912-)
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 4 |
| 01***32 | Washer,(With Auto Emergency Steering) | 4 |
| 67***51 | Bracket | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Fuel Filer Piping(#26203202-)
| 07***12 | Gasket,Injection Pump Piping | 2 |
| 67***40 | Tube | 1 |
| 67***10 | Bolt, Banjo Connector (M12-1.50x24) | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Fuel Filter(#26200912-)
| 67***10 | Cartridge,Fuel | 1 |
| 67***11 | Filter, Fuel - Secondary | 1 |
| 67***50 | Adapter, Filter Head | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Fuel Injection Pump (Feed Pump) (Inner Parts)(#26265378-)
| DK***20 | Bolt, Joint | 1 |
| DK***60 | Feed Pump Ass'Y | 1 |
| DK***00 | Valve,Check | 2 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Fuel Injection Pump (Governor) (1/2) (Inner Parts)(#26265378-)
| DK***00 | Washer | 1 |
| DK***00 | Shim? 2.00mm,(High Altitude Spec.) | 0 |
| DK***00 | Shim | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Fuel Injection Pump (Governor) (2/2) (Inner Parts)(#26265378-)
| DK***00 | Gasket | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Fuel Injection Pump (Pump) (1/2) (Inner Parts)(#26265378-)
| 67***30 | Injection Pump Ass'Y | 1 |
| DK***30 | Bearing | 0 |
| DK***20 | Housing | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Fuel Injection Pump (Pump) (2/2) (Inner Parts)(#26265378-)
| 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-1n-L(S/N 26200163-Up) : Engine : Fuel Injection Pump And Oil Piping(#26265378-)
| 07***12 | Gasket,(Without Air Compressor Type) (K2) | 7 |
| 07***10 | Screw, Banjo Connector (M10-1.25x20) | 1 |
| 62***10 | Seal, O-Ring (M10-1.00) | 1 |
Komatsu : S4d102e-1n-L(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-1n-L(S/N 26200163-Up) : Engine : Fuel Inlet And Outlet Joint(#26200912-)
| 61***10 | Connector, Banjo | 1 |
| 61***50 | Connector, Banjo | 1 |
| 67***40 | Cap,(For Shipping) | 2 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Fuel System Accessory(#26200912-)
| 07***12 | Gasket,Injection Pump Piping | 2 |
| 67***60 | Bolt, Mounting (M8-1.25x25) | 1 |
| 67***20 | Bolt, Flange (M8-1.25x20) | 1 |
Komatsu : S4d102e-1n-L(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-1n-L(S/N 26200163-Up) : Engine : Heat Shield(#26200912-26254100)
| 01***20 | Bolt,(Forwarded Individually Parts) | 6 |
| 01***25 | Bolt - Relay Mounting | 4 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 3 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Heat Shield(#26254101-)
| 01***20 | Bolt,(Forwarded Individually Parts) | 6 |
| 01***25 | Bolt - Relay Mounting | 4 |
| 01***20 | Bolt, Hose Clamps (Inlet And Return Line Hoses) | 3 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Injection Nozzle(#26200912-)
| 67***00 | Nozzle Holder Ass'Y | 1 |
| 67***30 | Nozzle | 1 |
| 67***50 | Seal, Rectangular Ring | 4 |
Komatsu : S4d102e-1n-L(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-1n-L(S/N 26200163-Up) : Engine : Muffler(#26236456-)
| 01***20 | Bolt,(Forwarded Individually Parts) | 2 |
| 01***25 | Bolt - Relay Mounting | 1 |
| 01***25 | Bolt, Mount Engine Oil Drain To Fuel Tank | 5 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Oil Cooler And Oil Filter(#26200278-)
| 67***50 | Valve, Pressure Relief | 1 |
| 67***51 | Valve, Pressure Relief | 1 |
| 67***30 | Plug, Pipe (1/8 Nptf) | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Oil Filler(#26200912-)
| 01***30 | Bolt, Mounting - Front Hand Rails | 2 |
| 61***20 | Cap Assembly, Oil Fill Tube | 1 |
| 61***80 | Gasket, Oil Fill Cap | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Oil Gauge And Remote Oil Drain(#26200912-)
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Oil Pan And Suction Tube(#26200912-)
| 09***50 | Liquid Gasket, Lg-7, 150g | 0 |
| 67***40 | Pan, Oil | 1 |
| 67***60 | Bolt, Mounting (M8-1.25x25) | 2 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Oil Pan Bolt
| 67***10 | Bolt, Mounting (M8-1.25 X 25) | 28 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Oil Pressure Switch And Water Temperature Sensor(#26226525-)
| 07***12 | Washer, Gasket,(Without Thermo Sensor) (K1) | 1 |
| 08***05 | Switch,Engine Oil Pressure | 1 |
| 60***61 | Sensor,Water Temperature | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Oil Pump(#26200163-26276328)
| 67***11 | Pump, Lubricating Oil | 1 |
| 67***20 | Bolt (M8x1.25x30) | 4 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Oil Pump(#26276329-)
| 67***12 | Pump, Lubricating Oil | 1 |
| 67***20 | Bolt (M8x1.25x30) | 4 |
Komatsu : S4d102e-1n-L(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-1n-L(S/N 26200163-Up) : Engine : Rear Hanger(#26200912-)
| 01***30 | Bolt, Mounting - Front Hand Rails | 2 |
| 67***20 | Plate Hanger | 1 |
Komatsu : S4d102e-1n-L(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-1n-L(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-1n-L(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-1n-L(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-1n-L(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-1n-L(S/N 26200163-Up) : Engine : Safety Relay (Forwarded Individually Parts)(#26269621-)
| 20***20 | Switch,Safety Relay | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Starting Motor (4.5kw)
| (6***0) | Starting Motor Ass'Y,(4.5kw) (See Fig.A621p-02a0) | 1 |
Komatsu : S4d102e-1n-L(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-1n-L(S/N 26200163-Up) : Engine : Starting Motor Mounting(#26236432-)
| 01***35 | Bolt, Mount Bracket To Floor | 2 |
| 67***11 | Gasket,Starter | 1 |
Komatsu : S4d102e-1n-L(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-1n-L(S/N 26200163-Up) : Engine : Tachometer Drive Cover
| 67***90 | Cover, Mechanical Tach Drive | 1 |
| 67***20 | Seal, Rectangular Ring | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Tappet
| 67***12 | Tappet, Valve | 8 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Thermostat Housing(#26200912-)
| 07***25 | Clip,(For Slag Handling) | 2 |
| 67***40 | Bolt, (M8x1.25x35) | 1 |
| 67***70 | Coupling, Plain Hose | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Thermostat(#26200163-26281220)
| 67***20 | Thermostat | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Thermostat(#26281221-26295762)
| 67***71 | Thermostat | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Thermostat(#26295763-)
| 67***71 | Thermostat | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Turbocharger Mounting(#26232528-)
| 67***62 | Kit,Turbocharger | 1 |
| 67***10 | Stud ((M10x1.50 (Both Ends) X42)) | 4 |
| 67***20 | Nut (M10x1.50) | 4 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Turbocharger Oil Piping(#26239667-)
| 01***12 | Bolt,(See Fig. K0210-16a0) | 3 |
| 07***38 | Seal, O-Ring | 1 |
| 07***59 | Clamp - Drain Hose | 2 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Under Plate
| 67***50 | Plate, Cylinder Block Stiffener | 1 |
| (0***0) | Liquid Gasket, Lg-7, 150g | 0 |
Komatsu : S4d102e-1n-L(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-1n-L(S/N 26200163-Up) : Engine : Water Connector Plug
| 67***10 | Plug, Pipe (1/2-14 Npt) | 2 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Water Pump(#26200912-26279303)
| 67***60 | Bolt (M8x1.25x22) | 2 |
| 67***00 | Water Pump Ass'Y | 1 |
| 67***01 | Water Pump Ass'Y | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Water Pump(#26279304-)
| 67***60 | Bolt (M8x1.25x22) | 2 |
| 67***02 | Water Pump Ass'Y | 1 |
| 67***20 | Seal, Rectangular Ring | 1 |
Komatsu : S4d102e-1n-L(S/N 26200163-Up) : Engine : Water Valve And Water Temperature Sensor(#26200912-)
| 01***16 | Bolt, Mount Solenoid Valve | 1 |
| 07***12 | Washer, Gasket,(Without Thermo Sensor) (K1) | 1 |
| 08***14 | Clip,(Without Ripper Point Light) | 1 |
S4D102E-1N-L(S/N 26200163-UP) serial number reference
The engine model and serial number are stamped on a metal data plate located on the left side of the engine block, typically near the injection pump or valve cover. The plate displays the manufacturer, engine model (e.g., S4D102E-1N-L), and the unique engine serial number. This engine serial is distinct from the machine's chassis PIN/ESN and is used to identify the specific engine variant and production sequence.
| Prefix | Identifies | Notes |
|---|---|---|
| S4D102E-1N-L | Engine Model | Identifies the specific engine configuration: 4-cylinder, 102mm bore, E-series emissions, N-stage, L-stroke variant. Serial range 26200163-UP is explicitly tied to this model in parts catalogs and equipment guides. The 'S' prefix denotes a turbocharged engine with an aftercooler. The 'N' and 'L' suffixes indicate specific emissions and stroke configurations for this generation. No other prefixes are documented for this exact serial range in the provided sources; other variants (D, E, F) are listed in general overhaul kits but not tied to this serial block in the source text. Verify with dealer for exact configuration mapping as sources do not provide a full prefix table for this specific engine family's serial breaks. |
Frequently asked questions
What engine does the Komatsu S4D102E-1N-L use?
It uses the Komatsu S4D102E-1 series 4-cylinder diesel engine, specifically the N-L configuration for the serial range 26200163-UP.
What is the operating weight of machines powered by this engine?
Machines equipped with this engine, such as the WA150-1 and PC100-6, typically have operating weights ranging from 10 to 15 tons, varying by configuration.
What replaced the S4D102E-1N-L engine?
The SAA4D102E-2 series engine replaced the S4D102E-1 series to meet updated emissions standards and improve performance.
What S4D102E-1N-L(S/N 26200163-UP) owners discuss
What are the known powertrain and hydraulic behaviors for the Komatsu S4D102E-1N-L engine series?
The S4D102E-1N-L engine is paired with hydraulic systems that are generally smooth and fuel-efficient. However, the Komatsu line is noted for a wear pattern where the hydraulic pump and engine tend to degrade together. If the hydraulic pump fails, the engine is often not far behind in terms of remaining service life. This synchronized wear contributes to lower resale values for machines in this series. Operators should monitor hydraulic performance closely as an indicator of overall powertrain health rather than treating them as independent systems. Have your dealer verify the specific hydraulic pump condition and engine compression before operation. (Source: published references discussion on Komatsu durability and resale trends; Komatsu shop manual SEBM010023 for the 102E-1 series.)
What undercarriage or wear patterns are typical for machines using the S4D102E-1N-L engine?
Machines equipped with the S4D102E-1N-L engine (such as the WA150-1 wheel loader) often exhibit undercarriage wear that coincides with major powertrain failures. The design philosophy of the Komatsu line during this era tends to wear out complete machines simultaneously rather than allowing one component to outlast the others significantly. Track tension and roller condition are critical, as mud or debris packed into the undercarriage can exacerbate travel issues. Operators should check for mechanical binding in the tracks before diagnosing hydraulic travel motor faults. (Source: published references user reports on Komatsu wear patterns; Komatsu Equipment Guide for WA150-1.)
What are the common engine quirks for the S4D102E-1 series?
The S4D102E-1 series shares basic engine block components (cylinder head, valves, block, crankshaft, connecting rods) with the Cummins 4BT.390, but uses a different camshaft, possibly different pistons, and a distinct fuel injection system. A common quirk is the oil pressure switch leaking, which is expected after approximately 20 years of service. The engine is sensitive to airflow restrictions; loss of power under load often points to clogged air filters, fuel filters, or restricted fuel tank venting rather than immediate fuel pump failure. The engine also requires specific attention to the charge-air hoses and turbocharger rotor play during inspections. (Source: published references comparison of S4D102E-1 and Cummins 4BT.390; Komatsu Diesel Engine Shop Manual SEBM010023.)
What are the common electrical or sensor issues for this engine/machine combination?
Komatsu excavators and wheel loaders from this era rely heavily on electronic control systems. A single faulty sensor or unstable power supply can trigger multiple warning signals, leading to intermittent starting, dashboard failures, or random shutdowns. Operators often report these symptoms before any major mechanical failure occurs. The engine control module and associated wiring harnesses should be checked for corrosion or loose connections, particularly in the engine compartment and near the main chassis grounds. (Source: Heavy Machinery Club report on common Komatsu excavator problems; Komatsu shop manual SEBM010023.)
What should be checked when buying a used machine with the S4D102E-1N-L engine (S/N 26200163-UP)?
When purchasing a used machine with the S4D102E-1N-L engine (serial number 26200163 and up), verify the exact serial prefix against the Komatsu Equipment Guide to confirm the engine model and parts compatibility. Key checks include: 1) Hydraulic oil condition and temperature behavior (weakness when hot indicates internal leakage); 2) Engine oil pressure switch for leaks; 3) Air and fuel filter restriction; 4) Undercarriage wear and track tension; 5) Turbocharger rotor play and inspection; 6) Electrical grounds and battery load test. Parts availability for gray market or older Komatsu models can be difficult, so ensure the parts book and specific part numbers are available for the exact serial range. (Source: Komatsu Equipment Guide for WA150-1; published references advice on buying used Komatsu; Komatsu shop manual SEBM010023.)
What are the recommended fluid specifications for the S4D102E-1N-L engine and associated systems?
Komatsu Genuine Lubricants are formulated to meet Komatsu Engineering Standards. For the S4D102E-1N-L engine, use Komatsu diesel engine oil. For the hydraulic system, use Komatsu hydraulic oil (HO) or equivalent Komatsu Engineering Standard fluid. For the cooling system, use Super-coolant AF-NAC. Axle oil and powertrain oil should also be Komatsu Genuine types. Using non-Komatsu fluids may not meet the strict standards required for long component life and machine reliability.
How does the S4D102E-1N-L engine differ from the Cummins 4BT.390 in terms of maintenance and parts?
While the S4D102E-1 and Cummins 4BT.390 share basic engine block components, they differ significantly in the fuel system, camshaft, and possibly pistons. The Komatsu-Cummins joint venture history means some accessories may vary by origin, but the core engine architecture is distinct. Maintenance for the S4D102E-1 requires specific Komatsu parts, which can be expensive and less readily available than generic Cummins parts for the 4BT.390. For example, OEM belt tensioners for the Komatsu engine are significantly more costly than aftermarket options for the Cummins. Mechanics should not assume parts interchangeability without verifying the specific engine model and serial range. (Source: published references discussion on S4D102E-1 vs. Cummins 4BT.390; Komatsu shop manual SEBM010023.)
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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