Single Cylinder Replacement — OEM-Spec Fuel Injector for Caterpillar 3406B, 3412C, 3408E & D9R Engines

On a large-displacement Cat engine like the 3406B or 3412C, a single misfiring injector is impossible to ignore — rough running, black smoke, and power loss that shows up immediately under load. This direct-fit replacement injector (7W7026 / 0R3423) restores precise fuel metering and spray geometry to the affected cylinder, getting your Cat engine back in spec without replacing the full set.

✅ Direct-Fit Compatibility

• Engines: Caterpillar 3406B, 3408E, 3412C
• Dozer: Cat D9R
• Generator: Cat SR4
• Bolt-on replacement — no modifications required
• Suitable for construction, mining, marine, and power generation applications

🔧 Built for Cat’s Largest Diesel Engines

• OEM-matched spray pattern — precise fuel atomization for clean combustion, reduced smoke, and better fuel economy
• 100% new aftermarket — not rebuilt or remanufactured; starts with a full service life
• Dual OEM cross-reference — replaces both 7W7026 and 0R3423 for confirmed fitment confidence
• Extreme-duty rated — engineered to handle the high-pressure, high-temperature demands of Cat’s large-displacement diesel engines
• No dealer markup — OEM-equivalent quality at a fraction of Cat dealer pricing

📦 What's Included

• 1 × Fuel Injector (7W7026 / 0R3423)

🔑 Key Specs

• Part Numbers: 7W7026, 0R3423
• Condition: 100% New Aftermarket
• Quantity: 1 piece (single cylinder replacement)
• Fitment: Caterpillar 3406B / 3408E / 3412C engines; Cat D9R dozer; Cat SR4 generator

💡 Replacing all six cylinders? Save with our 6-piece complete set for uniform performance and better value.

In stock and ready to ship. Order today and get your Cat back to full power.