0445120231 Fuel Injector / Nozzle – Bosch Compatible for Komatsu PC200-8 S6D107 & Cummins QSB6.7 | Rsolid Engine Parts
In the demanding world of heavy construction and earthmoving, fuel system reliability is non-negotiable. The Komatsu PC200-8 excavator powered by the rugged S6D107 engine, as well as industrial machinery using the Cummins QSB6.7, rely on precise fuel atomization to deliver the torque and responsiveness needed for digging, lifting, and grading. The 0445120231 high-pressure common rail injector (nozzle assembly) – Bosch compatible – is the exact OEM-spec component designed to meet these extreme duty cycles. At Rsolid Engine Parts, we provide fully calibrated, bench-tested 0445120231 injectors that restore your machine's productivity and fuel efficiency, minimizing costly downtime.
1. Structural Features & Advantages
The 0445120231 injector is a solenoid-operated common rail unit engineered to Bosch's rigorous standards, specifically for heavy-duty off-highway applications. Its construction is built to withstand constant vibration, high thermal loads, and variable fuel quality:
Hardened multi-hole VCO nozzle (typically 7 holes) – Produces an ultra-fine, homogeneous spray pattern that ensures complete combustion even under heavy load. This reduces soot formation, keeps the diesel particulate filter (DPF) cleaner, and minimizes white smoke during cold starts in winter conditions.
Heavy-duty servo-piston & plunger assembly – Manufactured from high-grade stainless steel with diamond-like coating (DLC) on critical wear surfaces. This resists abrasion from ultra-low sulfur diesel (ULSD) and biodiesel, ensuring consistent injection quantity over thousands of operating hours.
Fast-response solenoid stack – Enables precise multi-stage injection (pilot, main, post-injection). This results in smoother engine operation, reduced combustion noise (lowering operator fatigue), and immediate hydraulic response when you move the joysticks.
Integrated internal micro-filter – A robust inlet screen captures microscopic fuel contaminants, protecting the delicate needle and seat from scoring – a common cause of injector failure in dusty job site environments.
Key performance advantages for your Komatsu or Cummins equipment:
Restores full engine horsepower and hydraulic flow – eliminates sluggish arm/boom operation
Reduces specific fuel consumption (SFOC) by up to 8–12% versus worn injectors
Lowers exhaust temperatures, extending the life of the turbocharger and aftertreatment system
Eliminates "hunting" or surging at constant engine RPM (common in worn injectors)
2. Compatible Equipment & Engine Models
The 0445120231 injector is the direct OEM replacement for a wide range of construction, agricultural, and industrial diesel engines. Primary compatibility includes:
| Brand / OEM | Equipment / Application | Engine Family | Years (approx.) |
|---|
| Komatsu | PC200-8, PC210-8, PC220-8 Excavators | Komatsu S6D107 (6-cylinder, 6.7L) | 2006 – 2018 |
| Komatsu | D65EX-16, D65PX-16 Dozers, WA320-6 Wheel Loaders | Komatsu S6D107 / SAA6D107E | 2008 – 2020 |
| Cummins | Industrial applications (excavators, loaders, gensets) | Cummins QSB6.7 (Tier 3 / Tier 4i) | 2008 – present |
| Cummins | Light/medium commercial vehicles, buses | Cummins ISB 6.7 (industrial variant) | 2007 – 2019 |
Critical Note: This injector is often cross-referenced with Komatsu OEM part numbers such as 6261-11-3100, 6261-11-3200, and Cummins part numbers like 4327623, 4327624. Always verify the 0445120231 printed on your original injector body – the IQA (trim) code class may vary depending on emission tier.
3. Common Failures, Maintenance & Installation Tips
Typical symptoms of failing 0445120231 injectors in Komatsu PC200-8 or QSB6.7 engines:
Rough or uneven idle – The engine vibrates excessively at low RPM, detected via cylinder cut-out test.
Black smoke under load – Over-fueling due to worn or stuck nozzle causing incomplete combustion.
Difficulty starting – Extended cranking, especially after the machine has been parked overnight.
Engine oil dilution – Diesel fuel enters the crankcase (rising oil level with a strong fuel smell), reducing lubrication and risking bearing failure.
High leak-off (return flow) – One injector returns significantly more fuel (> 50 ml/min at idle) than the rest.
Preventive maintenance for heavy-duty injectors:
Replace the primary fuel filter (water separator) every 250 operating hours or weekly in dusty/humid conditions. Water is the #1 killer of common rail injectors.
Drain water from the fuel tank and filter bowl daily.
Use only high-cetane diesel (recommended ≥ 45) and avoid biodiesel blends above B5 unless Komatsu/Cummins approved.
Perform an injector return-flow balance test every 2,000 operating hours during major servicing.
Installation essentials (for workshop fitment):
Replace all sealing components – You must install a new copper compression washer, PTFE O-ring, and high-pressure pipe connection seals. Reusing old seals will cause combustion gas blow-by, leading to rapid nozzle carbonization and injector seizure.
Clean the injector bore meticulously – Use a specialised bore brush and vacuum to remove hard carbon deposits from the cylinder head bore. Any debris left will prevent the injector from seating squarely, altering the spray angle and damaging the piston crown.
Apply anti-seize compound sparingly – Only to the injector body threads (not to the nozzle tip or sealing face).
Torque the injector hold-down clamp to specification – For the Komatsu S6D107, the typical torque is 60–70 Nm + 90° angle (exact spec: usually 69 Nm + 90°). For the Cummins QSB6.7, it is often 45–50 Nm. Always consult your specific engine workshop manual – over-torquing can distort the injector body, causing the plunger to stick.
Perform mandatory IQA coding – Each 0445120231 injector has a unique 6-digit or alphanumeric IQA (Individual Quantity Adjustment) code printed on its side. This calibration code must be programmed into the Engine ECU using Komatsu EST (Engine Service Tool), Cummins Insite, or a compatible diagnostic scanner. Skipping this step will result in imbalanced cylinder fuel delivery, leading to rough running and reduced hydraulic performance.
Why Choose Rsolid Engine Parts?
When you choose Rsolid Engine Parts for your 0445120231 injectors, you invest in uptime and reliability:
100% bench-test verified – Each injector is dynamically tested for spray pattern, leak-off, and flow consistency against Bosch factory specifications. We guarantee OEM-level performance.
Premium Bosch-compatible materials – No low-grade clones. Our injectors feature genuine-spec nozzles and hardened internals matched to Komatsu and Cummins original durability.
Ready global stock – Fast shipping to worksites worldwide via DHL / FedEx / Air freight.
Technical support – Our experts help with IQA coding values, torque specifications, and installation troubleshooting.
Cost-effective pricing – Up to 40–50% savings compared to dealer genuine parts, without compromising quality.
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