Komatsuengine(no series)
Komatsu S6D170-1L(S/N 14674-UP)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu S6D170-1L is a six-cylinder, liquid-cooled diesel engine designed for heavy-duty applications in the 100-ton class. It powers the PC1000-1 excavator and the WA700-1L/WA700-3L wheel loaders. Production for the S6D170-1L series began in the early 1980s, with the specific serial range 14674-UP covering later iterations of this generation. The engine is characterized by its robust construction and high torque output, suitable for continuous heavy excavation and material handling. It was succeeded by the S6D170E-2A series, which introduced updated emissions compliance and electronic control systems.
Across its generations, the S6D170-1L evolved from mechanical injection systems to more refined fuel delivery, maintaining its core architecture while adapting to environmental standards. The machine remains significant in the used and parts market due to its widespread deployment in large mining and civil projects. Its longevity and the availability of aftermarket support for components like cylinder heads, pistons, and turbochargers keep it relevant for fleet managers seeking cost-effective power solutions for legacy Komatsu 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 S6D170-1L(S/N 14674-UP) specifications
Engine
| Model | S6D170-1L |
| Arrangement | 6 cylinder in line engine, turbocharged |
| Displacement | 23.2 L (793.5 cu in) |
| Bore | 170.0 mm (6.69 in) |
| Stroke | 170.0 mm (6.69 in) |
| Gross Power | 391 kW (524 hp) @ 1800 rpm |
| Torque | 2650 Nm (1954 lbf-ft) @ 1300 rpm |
Weights
| Engine Weight | 2740 kg (6040 lb) |
Dimensions
| Engine Length | 1860 mm (73.2 in) |
| Engine Width | 1240 mm (48.8 in) |
| Engine Height | 2093 mm (82.4 in) |
Performance
| Note | Travel speeds, lift/dig/dump/drawbar, and gradeability are machine-specific values not documented for the engine unit alone in the provided sources. |
Service capacities (summary)
| Note | Fuel tank, hydraulic system, engine oil, and cooling system capacities are machine-specific values not documented for the engine unit alone in the provided sources. |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu S6D170-1L(S/N 14674-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 S6D170-1L(S/N 14674-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, aluminum) and contaminants. Check hydraulic oil particle count and viscosity. Test coolant pH and SCA concentration to prevent scaling and corrosion. Monitor DEF levels daily on Tier 4 variants. Use KOMTRAX telematics to track load frequency and fault codes, allowing proactive intervention before component failure occurs.
Corrective & Common Repairs
Address common S6D170-1L issues by inspecting rocker arm assemblies and camshafts for wear, particularly in high-hour units. Check oil pump integrity and fuel injector performance. Replace worn cylinder liners and piston rings during intermediate repairs. Inspect turbocharger shaft play and bearing condition. Verify ECU connections and cable harness integrity for reliable engine management and fault code resolution.
Overhaul & Rebuild Points
Plan major overhauls based on compression loss and oil consumption trends. Replace cylinder head gaskets and valve seals when leakage is detected. Rebuild or replace the turbocharger if boost pressure drops significantly. Inspect the crankshaft for journal wear and replace bearings as needed. Ensure the fuel injection system is calibrated correctly during rebuilds to maintain optimal performance and fuel efficiency.
Seasonal & Environment Servicing
In cold climates, ensure coolant glycol concentration is adequate to prevent freezing. Use appropriate viscosity engine oil for starting temperatures. In dusty environments, inspect the air filter more frequently and clean the radiator fins daily to prevent overheating. Check hydraulic hose conditions for UV degradation in sunny regions. Drain water from the fuel separator regularly in humid conditions to prevent microbial growth and injector corrosion.
S6D170-1L(S/N 14674-UP) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 600-311-8291 | Cartridge,Fuel Filter | Fuel system service | Check fitment → |
| 600-311-8293 | Cartridge, Fuel Filter | Fuel system service | Check fitment → |
| 6127-71-6203 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
| 6127-71-6204 | Fuel Filter Ass'Y,(For Slag Handling) | Fuel system service | Check fitment → |
| 6127-71-6205 | Fuel Filter Ass'Y | Fuel system service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
S6D170-1L(S/N 14674-UP) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| E10 | Engine controller power failure or engine control drive system circuit malfunction | ECM power supply interruption, blown fuse, or damaged wiring harness | Inspect ECM power connections, fuses, and ground wires |
| E11 | Engine control system failure resulting in reduced output power to protect the engine | Critical sensor fault or internal engine management error | Check coolant temperature, oil pressure, and air filter status |
| CA111 | Engine controller internal fault | ECM hardware failure or corruption | Replace or reprogram the ECM |
| CA115 | Engine speed sensor and backup speed sensor failure | Broken sensor, wiring issue, or connector corrosion | Replace the speed sensor and verify voltage at the pin connector |
| CA441 | Battery voltage is too low | Weak battery, loose connections, or alternator failure | Replace the alternator or battery; check the voltage regulator |
| CA442 | Battery voltage is too high | Faulty voltage regulator or alternator overcharging | Replace the alternator or battery; check the voltage regulator |
| CA451 | Common rail pressure sensor feedback value is too high | Malfunction in the rail sensor or actual overpressure condition | Diagnose the fuel rail pressure sensor or pump lines |
| CA559 | Common rail pressure is too low | Fuel supply issue or sensor error | Evaluate fuel pump regulator (IMV/PCV) |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter |
| B@BCNS | Engine coolant overheating | Low coolant level, failed fan belt, or blocked radiator | Check radiator fins, fan belt, and coolant level |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
S6D170-1L(S/N 14674-UP) attachments & work tools
Dozer Attachments
The S6D170-1L engine (S/N 14674-Up) powers the D275A-2 dozer series. Factory configurations include standard and wide dozer blades with capacities varying by configuration/series. Guarding options include side cutters and ripper shrouds for the rear-mounted ripper assembly.
Wheel Loader Attachments
The S6D170-1L engine is specified for the WA700-1L and WA700-3L wheel loaders. Work tools include standard and heavy-duty buckets with capacities varying by configuration/series. Hydraulic kit arrangements support quick coupler systems for rapid tool interchangeability.
Excavator Attachments
The S6D170-1L engine is associated with the PC1000-1 excavator in aftermarket fitment data. Standard work tools include digging buckets with capacities varying by configuration/series. Hydraulic arrangements require specific flow kits for high-reach or heavy-duty tool configurations.
Generator Set Attachments
The S6D170-1L engine powers the EGS650 generator set. Configurations include standard sound-attenuated enclosures and open-frame options. Work tool compatibility is limited to electrical output connections and fuel system interfaces rather than mechanical implements.
All S6D170-1L(S/N 14674-UP) assemblies by section
Every catalogued assembly group for the Komatsu S6D170-1L(S/N 14674-UP). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Engine
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Air Cleaner
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 12 |
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 3 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Air Intake
| 01***40 | Bolt,(For Position Fixing) | 4 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 3 |
| 01***95 | Bolt,(For Reversible Fan) | 11 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Alternator (Inner Parts) (50a)
| 60***40 | Alternator A. (50a),(See Fig.0641) | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Washer | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Alternator (Inner Parts) (75a)
| 60***10 | Alternator A. (75a) | 1 |
| SD***X0 | Coil Assembly | 1 |
| SD***X0 | Washer | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Alternator Drive
| 01***30 | Bolt,(For France Noise Suppression) | 3 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 3 |
| 04***24 | Pin, Spring | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Alternator Mounting (50a)
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 3 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Alternator Mounting (75a)
| 01***30 | Bolt,(For France Noise Suppression) | 4 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 3 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Auto Primming System
| 01***12 | Bolt,(Without R.P.C.U.) | 4 |
| 01***60 | Bolt,(Without Alternator Bracket) | 5 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Camfollower Cover
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 16 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 12 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Camshaft And Cam Follower
| 01***32 | Washer,(Not Used With Emergency Str.) | 12 |
| 04***38 | Key | 1 |
| 04***12 | Ring, Snap (4) | 2 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Cooling Fan
| 60***20 | Fan,(Tropical Spec.) | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Corrosion Resistor
| 01***35 | Bolt,(Without Auto Priming System) | 2 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 1 |
| 01***06 | Nut, Regular Hexagon (M8-1.25) | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Crank Pulley
| 61***20 | Washer | 6 |
| 61***11 | Pulley? Hardening | 1 |
| 61***22 | Bolt | 6 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Crankshaft
| 04***28 | Key, Plain Woodruff | 1 |
| 04***24 | Pin,Dowel (For No.3 Housing) | 1 |
| 61***00 | Bearing Assembly | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Cylinder Block
| 01***18 | Bolt | 6 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Washer,Spring?(Sandy And Dusty Spec.) | 6 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Cylinder Block Gasket Kit
| 04***12 | Lock (Kit) | 1 |
| 07***09 | O-Ring,(F4350-61a0 -33 ) | 3 |
| 07***12 | O-Ring, Between Valve And Pump | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Cylinder Head
| 07***28 | O-Ring,(For Transmission Screen) | 2 |
| 07***08 | Plug (Kit) | 4 |
| 07***11 | Plug,(For Shipping) | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Cylinder Head Gasket Kit
| 02***43 | O-Ring,Water Manifold | 2 |
| 02***75 | O-Ring,(For Japan) (K1) | 4 |
| 02***81 | O-Ring,Air Connector | 2 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Damper
| 61***00 | Damper | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Engine Mounting
| 01***50 | Bolt | 8 |
| 01***45 | Washer,(Without R.O.P.S.) | 8 |
| 04***34 | Pin-Dowel, Pin,Dowel (For Shipping) | 4 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Exhaust Manifold
| 01***90 | Bolt | 22 |
| 07***08 | Plug | 1 |
| 61***90 | Spacer | 22 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fan Belt
| 04***77 | V-Belt Set,Ec | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Flywheel
| 01***70 | Bolt | 10 |
| 61***20 | Washer, Plain (M20) | 10 |
| 61***00 | Flywheel Assembly | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Flywheel Housing
| 01***20 | Bolt,(Large Capacity Type) (Std) | 8 |
| 01***30 | Bolt,(For France Noise Suppression) | 3 |
| 01***45 | Bolt, Mount Bracket | 4 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Front Cover
| 01***16 | Bolt,(For Slag Handling) | 12 |
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***60 | Bolt, Trunnion Cap | 10 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Front Power Take Off (With P.T.O.)
| 01***25 | Bolt,(Without Auto Priming System) | 6 |
| 01***25 | Bolt - Rear Guard Mounting | 2 |
| 01***60 | Bolt, Trunnion Cap | 3 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Front Power Take Off (Without P.T.O.)
| 01***25 | Bolt,(Without Auto Priming System) | 6 |
| 01***25 | Bolt - Rear Guard Mounting | 2 |
| 01***60 | Bolt, Trunnion Cap | 3 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Filter
| 01***65 | Bolt,(For Alternator Bracket Mount) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 2 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Injection Pump (Inner Parts) (Coupling)(#14674-15526)
| DK***00 | Bolt | 2 |
| DK***00 | Bolt | 6 |
| DK***00 | Coupling | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Injection Pump (Inner Parts) (Coupling)(#15527-)
| DK***00 | Bolt | 2 |
| DK***00 | Bolt | 6 |
| DK***00 | Coupling | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Injection Pump (Inner Parts) (Feed Pump)(#14674-15526)
| DK***00 | Valve,Check | 4 |
| DK***20 | Bolt,Joint | 1 |
| DK***30 | Eye,Joint | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Injection Pump (Inner Parts) (Feed Pump)(#15527-)
| DK***00 | Valve,Check | 4 |
| DK***20 | Bolt,Joint | 1 |
| DK***30 | Eye,Joint | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Injection Pump (Inner Parts) (Governor) (1/2)(#14674-15526)
| DK***00 | Gear | 1 |
| DK***00 | Connector | 1 |
| DK***00 | Shim? 2.00mm,(High Altitude Spec.) | 0 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Injection Pump (Inner Parts) (Governor) (1/2)(#15527-)
| DK***00 | Gear | 1 |
| DK***00 | Connector | 1 |
| DK***00 | Shim? 2.00mm,(High Altitude Spec.) | 0 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Injection Pump (Inner Parts) (Governor) (2/2)(#14674-15526)
| DK***00 | Bushing | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Injection Pump (Inner Parts) (Governor) (2/2)(#15527-)
| DK***00 | Bushing | 1 |
| DK***40 | Gasket,Air Compressor | 2 |
| DK***00 | Nut,Cap | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Injection Pump (Inner Parts) (Pump) (1/2)(#14674-15526)
| 61***50 | Injection Pump Ass'Y | 1 |
| DK***30 | Bearing,Roller | 1 |
| DK***10 | Pump Ass'Y | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Injection Pump (Inner Parts) (Pump) (1/2)(#15527-)
| 61***51 | Injection Pump Ass'Y | 1 |
| DK***30 | Bearing,Roller | 1 |
| DK***00 | Bearing,Center | 2 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Injection Pump (Inner Parts) (Pump) (2/2)(#14674-15526)
| DK***00 | Nut | 12 |
| DK***00 | Shim? 0.875mm | 0 |
| DK***00 | Shim? 0.500mm | 0 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Injection Pump (Inner Parts) (Pump) (2/2)(#15527-)
| DK***00 | Nut | 12 |
| DK***00 | Shim? 0.875mm | 0 |
| DK***00 | Shim? 0.500mm | 0 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Injection Pump Drive
| 01***30 | Bolt,(With Body Positioner) | 4 |
| 01***35 | Bolt, Mount Ground Driven Steering Pump | 5 |
| 01***12 | Nut | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Injection Pump Mounting(#14674-15526)
| 61***30 | Pin,Dowel | 2 |
| 61***50 | Bolt | 4 |
| (6***0) | Injection Pump Ass'Y,(See Fig.A4010-B6b6) | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Injection Pump Mounting(#15527-)
| 61***30 | Pin,Dowel | 2 |
| 61***50 | Bolt | 4 |
| (6***1) | Injection Pump Ass'Y,(See Fig.A4010-B6b6a) | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Fuel Return
| 01***16 | Bolt,(Sandy And Dusty Spec.) | 2 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 1 |
| 01***55 | Bolt,(For Suction? Reversible Fan) | 2 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Head Cover
| 01***55 | Bolt,(See Service News) | 28 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 28 |
| 01***16 | Washer,(With Shoe Slip Control) | 28 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Heat Shield
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***95 | Bolt,(For Reversible Fan) | 6 |
| 01***32 | Washer,(With Auto Emergency Steering) | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Holder (Inner Parts)
| 61***11 | Holder Ass'Y | 6 |
| DK***00 | Shim? 0.80mm | 0 |
| DK***00 | Shim? 1.38mm | 0 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Idler Gear
| 01***35 | Bolt,(Not Shown) | 6 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 6 |
| 01***45 | Washer,(Without R.O.P.S.) | 3 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Injection Bracket And Piping
| 01***30 | Bolt | 7 |
| 01***35 | Bolt | 3 |
| 01***35 | Bolt,(Without Auto Priming System) | 2 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Injection Nozzle
| 07***14 | Tube, Spill | 5 |
| 07***80 | Clip | 10 |
| 61***10 | Bolt,Nozzle Holder | 12 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Lubricating Oil Cooler
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***25 | Bolt,(Without Auto Priming System) | 6 |
| 01***65 | Bolt,(For Alternator Bracket Mount) | 3 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Lubricating Oil Filter
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
| 01***45 | Bolt,(Cold Terrain Spec.) | 6 |
| 01***50 | Bolt - Torque Converter Totransmission Mounting | 2 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Lubricating Oil Pump
| 01***70 | Bolt - Bracket And Oil Inlet Tubemounting | 2 |
| 01***40 | Bolt,For Weight Adjusting Bolt | 4 |
| 01***50 | Bolt | 2 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Mechanical Pump
| 01***16 | Bolt (Welded) | 2 |
| 01***05 | Bolt (M10-1.50x105) | 4 |
| 01***12 | Bolt | 4 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Muffler Ejector Piping
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***30 | Bolt,(For France Noise Suppression) | 1 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Muffler Mounting
| 01***35 | Bolt | 1 |
| 01***30 | Bolt, Mount Pump | 2 |
| 01***70 | Capscrew - M12 | 4 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Name Plate And Caution (Japanese-English)
| 04***50 | Screw | 4 |
| 09***30 | Plate? Name,(English) (Limited Supply) | 1 |
| 09***61 | Plate? Instruction,(Japanese-English) (Not Shown) | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Oil Filler
| 01***30 | Bolt,(For France Noise Suppression) | 6 |
| 01***40 | Bolt,(Dust And Dirt Protection) | 2 |
| 01***08 | Nut,R.H. Thread | 4 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Oil Gauge
| 01***25 | Bolt,(Without Auto Priming System) | 2 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 1 |
| 01***80 | Bolt,(Shim 5 Pieces Over) | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Oil Pan And Suction Tube
| 01***12 | Bolt,(Without R.P.C.U.) | 3 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Piston
| 02***13 | Pin, Dowel | 4 |
| 61***60 | Piston Ring Ass'Y, Per Cylinder | 6 |
| 61***20 | Piston | 6 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Rocker Arm And Houning
| 01***55 | Bolt,(For France Noise Suppression) | 6 |
| 01***90 | Bolt,For Reversible Fan | 36 |
| 01***15 | Bolt | 6 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Safety Guard
| 01***20 | Bolt,(Large Capacity Type) (Std) | 4 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 2 |
| 01***85 | Bolt, Control Valve Mounting | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Spare Parts
| 04***33 | V-Belt | 1 |
| 04***77 | V-Belt Set,Ec | 1 |
| 60***30 | Cartridge,Oil Filter | 2 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Starting Motor (Inner Parts) (7.5kw)
| 60***10 | Starting Motor Ass'Y,(7.5kw) | 1 |
| 60***11 | Starting Motor Ass'Y, (7.5kw) | 1 |
| KD***20 | Magnetic Switch Assembly | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Starting Motor Mounting (7.5kw)
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***20 | Bolt,(Used When Towing Winch) | 2 |
| 01***45 | Bolt,(For Slag Handling) | 6 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Tension Pulley
| 01***20 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***20 | Bolt,(Large Capacity Type) (Std) | 2 |
| 01***35 | Bolt - Torque Converter Totransmission Mounting | 3 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Thermostat Housing
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 9 |
| 01***30 | Bolt,(For France Noise Suppression) | 3 |
| 01***95 | Bolt,(For Reversible Fan) | 4 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Turbocharger (Inner Parts)
| 01***16 | Bolt | 8 |
| 04***50 | Screw | 2 |
| 65***50 | V-Band | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Turbocharger Lubricating Oil Piping
| 01***16 | Bolt,(For Slag Handling) | 1 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 4 |
| 01***35 | Bolt, Mounting - Flywheel Housing End | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Turbocharger Mounting
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 8 |
| 61***10 | Gasket,Turbocharger Mounting | 1 |
| 61***81 | Flange | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Water Manifold
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 5 |
| 01***30 | Washer,Spring(Sandy?Dusty Terrain S.) | 5 |
| 01***16 | Washer,Radio Controlled Slag Handling | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Water Pump
| 01***16 | Bolt,(For Slag Handling) | 2 |
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 1 |
| 01***30 | Bolt,(For France Noise Suppression) | 7 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Water Pump Gasket Kit
| 02***43 | O-Ring,Water Manifold | 1 |
| 07***75 | O-Ring,Steering Oil Filter | 1 |
| 07***45 | O-Ring - (K6) | 1 |
Komatsu : S6d170-1l(S/N 14674-Up) : Engine : Water Temperature
| 01***12 | Bolt,(Without R.P.C.U.) | 1 |
| 01***08 | Washer,(For 1 Attachment And Pat) | 1 |
| 07***12 | Washer, Gasket,(Without Thermo Sensor) (K1) | 2 |
S6D170-1L(S/N 14674-UP) serial number reference
The engine serial number plate is located on the left side of the engine block, typically near the injection pump. The prefix is the first part of the engine model code stamped on this plate (e.g., S6D170-1L), followed by the serial number. Match the prefix and serial range to the correct parts catalog.
| Prefix | Identifies | Notes |
|---|---|---|
| S6D170-1L | Standard | S/N 14674-UP. Primary engine model for this serial range. Verify with dealer for exact configuration details. |
| S6D170-1L-B | B Variant | S/N 14674-UP. Listed as a catalog variant for the S6D170-1L family. Verify with dealer for specific configuration differences. |
| S6D170-1L-W | W Variant | S/N 14674-UP. Listed as a catalog variant for the S6D170-1L family. Verify with dealer for specific configuration differences. |
Frequently asked questions
What engine does the Komatsu S6D170-1L use?
The Komatsu S6D170-1L is a six-cylinder, liquid-cooled, turbocharged diesel engine with a displacement of 23.1 liters. It features a 170mm bore and is designed for heavy-duty applications in excavators and wheel loaders.
What is the operating weight of the machine powered by this engine?
The operating weight varies by configuration and series. For the PC1000-1 excavator, the weight is approximately 100 tons. For the WA700-1L wheel loader, the weight ranges from 70 to 80 tons depending on the attachment and counterweight setup.
What replaced the S6D170-1L engine?
The S6D170-1L was succeeded by the S6D170E-2A series. This newer generation introduced updated emissions compliance, electronic control systems, and improved fuel efficiency while maintaining the core six-cylinder architecture.
What S6D170-1L(S/N 14674-UP) owners discuss
What are the known powertrain and hydraulic behaviors for machines equipped with the S6D170-1L engine?
The engine is paired with hydraulic systems sensitive to oil temperature and viscosity. Owners report that hydraulic functions may become weak when the oil warms up, indicating internal leakage in pumps, control valves, or cylinders less obvious when cold. The machine is designed for smooth operation and fuel efficiency; if all hydraulic functions slow down simultaneously, the issue often lies in the shared hydraulic supply, pump control, or engine performance rather than individual cylinders. The engine itself is robust, but hydraulic pump failure is a known precursor to engine wear in older dash-6 configurations, affecting resale value.
What undercarriage or wear patterns are typical for this machine type?
Components such as bushings, bearings, and track pads are subjected to significant wear and tear. Worn-out bushings can lead to noise and vibration, while worn bearings may cause premature failure of the tracks. Track tension should be monitored regularly; repeated loosening can indicate issues with the adjuster or undercarriage wear. Machines operating in dusty or muddy environments often experience debris packed into the undercarriage, which increases resistance and accelerates wear on rollers and track chains.
What are the engine quirks per the S6D170-1L series?
The S6D170-1L is a 6-cylinder, 23.1-liter diesel engine with a bore of 170 mm. It is known for high alloy rings and hardened liners, distinguishing it from earlier designs with soft liners. The engine uses a Bosch-style fuel system with injectors operating at high pressure (approximately 3,200 PSI). Owners note that the engine is generally reliable but requires strict attention to cooling system maintenance, as overheating can occur if the radiator, hydraulic oil cooler, and charge-air cooler are packed with debris. The engine is often found in large excavators like the PC1000-1 and wheel loaders like the WA700-1L.
What are common electrical or sensor issues reported by operators?
Komatsu excavators rely heavily on electronic control systems, meaning 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. These issues are frequently linked to battery state, engine and chassis grounds, or connector integrity rather than a single component failure. Multiple fault codes often point to battery health or ground connections first.
What should be checked when buying a used machine with the S6D170-1L engine (S/N 14674-UP)?
Verify the engine serial number is 14674 or higher to confirm the S6D170-1L configuration. Check hydraulic system performance both cold and hot to identify internal leakage. Inspect the cooling package for blockage between heat exchangers. Test the engine under load to ensure it does not lose power or drop RPM excessively when hydraulics are engaged. Check for signs of previous pump or engine repairs, as pump failure can indicate imminent engine wear. Verify the condition of the undercarriage, including track tension and roller wear.
What are the recommended fluid specifications for this engine?
Use Komatsu Genuine Diesel Engine Oil that meets Komatsu Engineering Standards. For the hydraulic system, use Komatsu Genuine Hydraulic Oil. Coolant should be Komatsu Super Coolant AF-NAC. Axle and powertrain oils must also meet Komatsu specifications. Using fluids that do not meet these standards can compromise engine and hydraulic system longevity.
What is a safety-critical fix related to the cooling system?
If the engine overheats during heavy excavation, immediately inspect the radiator, hydraulic oil cooler, and charge-air cooler for debris packed between the heat exchangers. A blocked cooling package can lead to catastrophic engine failure. Have your dealer verify the cooling system integrity and fan operation before resuming heavy work.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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