Product Specifications:
The 3175278 is a heavy-duty, precision-engineered MEUI Fuel Injector (Mechanically Actuated Electronically Controlled Unit Injector – Aftermarket Replacement) designed specifically for Caterpillar 3176C 6-cylinder diesel engines. These robust powerplants are widely utilized across a variety of heavy earthmoving equipment, most notably the 966G II wheel loaders, D7R II track-type tractors, and the legendary 140H / 14H series motor graders. Manufactured to verify against rigorous OEM testing protocols to ensure maximum horsepower output, optimal fuel atomization, and longevity under heavy loads.
📊 Part Number Cross Reference
(Data strictly verified based on application catalog)
| New Part Number | Reman Part Number |
| 317-5278, 3175278 | 20R-0055, 20R0055 |
| 208-9160, 2089160 | 10R-1264, 10R1264 |
| 170-5240, 1705240 | – |
🚛 Fits Applications (Engine & Vehicle)
(Verified application list)
| Make | Machine / Model | Engine Code |
| Caterpillar | Landfill Compactor: 816F | 3176C |
| Caterpillar | Motor Grader: 140H, 143H, 14H, 160H, 163H | 3176C |
| Caterpillar | Pipelayer: 572R II | 3176C |
| Caterpillar | Soil Compactor: 815F | 3176C |
| Caterpillar | Track-Type Tractor: D7R II | 3176C |
| Caterpillar | Wheel Dozer: 814F | 3176C |
| Caterpillar | Wheel Loader: 966G II | 3176C |
👨🔧 Tech Notes & Installation Guide
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💰 Why Replace the Full Set?
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The Risk: Mixing a brand-new MEUI injector with old, worn units on your 6-cylinder 3176C engine causes severely uneven fuel delivery. This leads to Cylinder Power Imbalance (Engine Vibration, Drivetrain Stress, and Heavy Exhaust Smoke under load).
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The Fix: Take advantage of our Volume Discounts to install a matched set of 6 units. This ensures uniform injection pressure across all cylinders and restores smooth factory performance.
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✅ Verification & Calibration:
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These MEUI injectors are mechanically actuated by the camshaft and electronically controlled. Strict mechanical adjustments (valve lash and injector height) are required during installation. Entering the correct injector trim codes into the Caterpillar ECM is also necessary for optimal fuel mapping.
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⚠️ Critical Cleaning Step:
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The entire high-pressure fuel delivery system MUST be thoroughly flushed to remove metal shavings and debris. 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) 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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