Remanufactured injector, cross-ref 3407776, 3411762, 4384360. Bench-tested before shipment.
Quote within 24 hours. Send a photo of your nameplate and we will confirm the exact match.
3407776 is supplied as a remanufactured replacement injector. Cross-reference numbers: 3407776, 3411762, 4384360, QSN14. Application recorded for this part: Fits Cummins — N14. The injector sits at the end of the rail and does the final metering work: it receives fuel already at high pressure and decides both how much enters the cylinder and how well atomised it is. That combination governs power, smoke and fuel consumption more directly than almost any other part on the engine. What owners usually notice first: longer cranking, a rougher idle, more smoke than the engine used to produce, worse consumption, and occasionally a metallic knock that appears under load and clears once the engine is revved. Because those symptoms also point to compression, turbocharger or air-side problems, it is worth confirming before ordering. A return-flow (back-leakage) test across all injectors and a cylinder cut-out test will usually identify both whether the fault is injector-related and which cylinder is responsible. Fitment notes: injectors on the same engine wear together. Replacing only the failed unit often leaves the others close behind, and a single new injector reading differently from its neighbours will cause exactly the rough running you were trying to fix. Replacing as a matched set avoids that. Always fit new copper sealing washers and seals — used washers rarely seal a second time — and where the system requires injector classification or IQA codes, have them programmed to the ECU after fitting. Rebuilt rather than refurbished: full teardown and measurement, worn components replaced instead of cleaned and reused, sealing surfaces restored to specification, then bench calibration and testing. The record is what separates this from a used part — we can provide the test sheet for your order. Covered by a 12-month warranty.
| Part number | 3407776 |
| Condition | Remanufactured (not a genuine OEM new part) |
| Cross-reference | 3407776, 3411762, 4384360, QSN14 |
| Application | Fits Cummins — N14 |
| Process | Disassembled, cleaned, measured, wear parts replaced, machined to specification |
| Bench test | Delivery, return flow, opening pressure and leakage recorded before dispatch |
| Warranty | 12 months |
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