Product Specifications:
The 4P9075 is a heavy-duty, precision-engineered Fuel Injector / Unit Injector (Aftermarket Replacement) designed specifically for Caterpillar 3508, 3512, and 3516 series engines. These large-displacement engines are widely utilized in demanding applications such as heavy industrial machinery, generator sets, marine vessels, and petroleum equipment. Manufactured to verify against rigorous OEM testing protocols to ensure maximum power output and durability.
📊 Part Number Cross Reference
(Data strictly verified based on application catalog)
| New Part Number | Reman Part Number |
| 9Y-4543, 9Y4543 | 0R-3051, 0R3051 |
| 7E-3381, 7E3381 | 0R-3051, 0R3051 |
| 4P-9075, 4P9075 | – |
🚛 Fits Applications (Engine & Vehicle)
(Verified application list)
| Make | Machine | Engine and model |
| Caterpillar | Generator Set | 3508, 3508C, 3512, 3516 |
| Caterpillar | Industrial | 3508, 3512, 3516 |
| Caterpillar | Marine Engine | 3508, 3512, 3516 |
| Caterpillar | Petroleum Engine | 3512 |
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👨🔧 Tech Notes & Installation Guide
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💰 Why Replace the Full Set?
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The Risk: The CAT 3500 series engines are massive V8, V12, or V16 powerplants. Mixing brand-new unit injectors with worn ones causes severe fuel delivery inconsistencies, leading to Cylinder Power Imbalance (Heavy Engine Vibration, Knocking, and Drivetrain Stress).
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The Fix: Take advantage of our Volume Discounts to install a matched set of 8, 12, or 16 units (depending on your specific engine model). This restores smooth factory performance and fuel efficiency.
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✅ Direct Replacement (No IMA Coding):
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These mechanical unit injectors are precisely calibrated on the test bench to match OEM flow standards. No electronic IMA coding is required for installation, though mechanical valve lash and injector height adjustments are necessary.
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⚠️ Critical Cleaning Step:
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Industrial and marine fuel systems MUST be thoroughly flushed to remove sludge and contamination. Always install new, high-efficiency fuel filters 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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