Product Specifications:
The 1278222 is a heavy-duty, precision-engineered Unit Fuel Injector (Aftermarket Replacement) designed specifically for Caterpillar 3114, 3116, and 3126 series engines. These robust powerplants are widely utilized across a diverse range of heavy equipment, including CAT excavators and wheel loaders, Challenger agricultural tractors, and Lexion combine harvesters. Manufactured to verify against rigorous testing protocols to ensure optimal fuel atomization, durability, and factory-level horsepower.
📊 Part Number Cross Reference
(Data strictly verified based on application catalog)
| New Part Number | Reman Part Number |
| 127-8222, 1278222 | 0R-8461, 0R8461 |
| 107-1230, 1071230 | 0R-8461, 0R8461 |
| 4P-1731, 4P1731 | 0R-3580, 0R3580 |
🚛 Fits Applications (Engine & Vehicle)
(Verified application list)
| Make | Machine | Engine and model |
| Caterpillar | Excavator | 3116 322 L, 325, 325 L |
| Caterpillar | Industrial | 3114, 3116 |
| Caterpillar | Wheel Loader | 3116 950F, 950F II, 960F |
| Caterpillar | Wheel Tractor Scraper | 3116 613CII |
| Challenger | Tractor | 3126 35, 45, 55 |
| Lexion | Combine Harvester | 3126B 460 |
👨🔧 Tech Notes & Installation Guide
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💰 Why Replace the Full Set?
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The Risk: Mixing a brand-new unit injector with old, worn units on your 3116 or 3126 engine causes uneven fuel delivery. This leads to Cylinder Power Imbalance (Engine Vibration, Drivetrain Stress, and Heavy Exhaust Smoke).
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The Fix: Take advantage of our Volume Discounts to install a matched set of 4 or 6 units (depending on your engine configuration). This ensures uniform fuel pressure and restores smooth factory performance.
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✅ Direct Replacement Calibration:
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These mechanical/HEUI unit injectors are precisely calibrated on the test bench to match OEM flow standards. (Note: Mechanical valve lash and injector height adjustments are strictly required during installation for proper timing).
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⚠️ Critical Cleaning Step:
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The entire fuel delivery system MUST be thoroughly flushed to remove sludge and contamination. Always install a brand-new, high-efficiency fuel filter to protect the precision plungers from scoring.
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🔍 Explore More Heavy Duty Parts:
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Looking for more options? Browse our complete selection of Fuel Injectors.
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Keep your engine running smoothly with our premium Engine Components.
⚖️ Legal Disclaimer
Part numbers, OE numbers, and brand names (e.g., Caterpillar, CAT, Challenger, Lexion) mentioned above are for reference and identification purposes only. This product is a compatible aftermarket replacement part and is NOT manufactured, sponsored, or affiliated with the original equipment manufacturers.
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