6-Piece Fuel Injector Set with Nozzle 688840C91 — Complete Replacement for Navistar DT466 Engine

The Navistar DT466 is one of the most iconic and widely used inline-6 diesel engines in North America — powering International school buses, medium-duty trucks, and a broad range of commercial and municipal vehicles for decades. When injectors wear out on a DT466, the performance drop is felt across all six cylinders: rough running, loss of power under load, hard starts, excessive black smoke, and rising fuel consumption. This complete set of six brand-new fuel injectors with integrated nozzles restores precise fuel atomization and consistent combustion across all six cylinders, bringing your DT466 back to the smooth, reliable, and fuel-efficient operation it’s built for.

Why Choose This Injector Set?

• Complete Set of 6 with Nozzles Included — A full matched set with integrated nozzles for all six cylinders ensures balanced combustion, even power delivery, and consistent long-term reliability. Everything needed for a complete injector refresh in one order.
• Direct OEM-Equivalent Fit — Engineered specifically for the Navistar DT466 inline-6 diesel engine. Drops in without modifications for a clean, professional installation.
• 100% New Aftermarket Parts — Not rebuilt or remanufactured. Full service life from day one, built to handle the continuous heavy-duty demands of commercial truck, bus, and fleet operation.
• Restored Fuel Atomization — Precision-matched nozzles restore factory spray pattern and injection pressure across all six cylinders, recovering lost power, improving fuel economy, and eliminating rough running and black smoke.
• Reliable Cold Starts — Consistent fuel delivery ensures dependable starting in cold conditions, protecting the engine and keeping your vehicle or fleet operational when you need it most.
• Three Cross-Reference Part Numbers — Matches 688840C91, 749763C91, and 780328 for easy verification across multiple parts catalogs and confident ordering.

Compatible Part Numbers

688840C91 | 749763C91 | 780328

Compatible Engine

Navistar DT466 (Inline-6 Diesel)

Typical Vehicle & Equipment Applications

International School Buses | Medium-Duty Trucks | Commercial Vehicles | Municipal Fleet Vehicles | Industrial Equipment

Product Details

• Part Number: 688840C91 / 749763C91 / 780328
• Quantity: Set of 6 Injectors (with Nozzles)
• Condition: 100% New Aftermarket
• Compatible Brand: Navistar / International
• Engine: Navistar DT466 Inline-6

Only need one? Also available as a single injector with nozzle for targeted replacement.

Give your Navistar DT466 the complete injector refresh it deserves — order today and ship fast from Fuel Parts Depot.