Navistar N9
Demand More From the Midrange Market.

Built on the same proven I-6 platform as Navistar’s legendary DT engine, the Navistar N9 grew from a big idea: bring traditional big bore features such as wet-sleeve design and in-chassis rebuild capability to the midrange diesel market. New features including increased 9.3-liter displacement by longer stroke, dual sequential turbo technologies, single-piece gallery-cooled steel pistons and crankcase ladder reinforcement enhance reliability, durability and productivity.
Vocational Applications
The N9 is compatible with a full range of automatic and manual driveline options and thousands of potential build configurations to serve the broadest range of on- and off-highway applications. Ratings offer up to 330 hp and 950 lb.-ft. of torque. Shift energy management technology allows for higher peak torque when used with select transmissions.
Excellent Power

N9 engines use dual sequential turbochargers to deliver powerful performance for any job. The smaller, primary turbo responds quickly for immediate takeoff at low engine speeds, and the larger, secondary turbo provides peak power at higher speeds and on steep grades.

A rock-solid, time-tested platform ensures legendary reliability. For the new generation, Navistar engineers carried forward the proven technologies and components such as: premium plateau-honed cylinder design, reinforced bearing-cap ladder, and durable roller cam followers. Enhancements in reliability were also made with the dual sequential free-wheel turbochargers and a premium wiring harness design.
The N9 features the same precision-machined wet-sleeved design that provides heavy-duty engine durability. Six bolts per cylinder provide head gasket integrity unmatched by competitive four-bolt designs. Premium valve train components and low-friction design further increase engine life. Adding to the appeal of this engine is its ability to be completely rebuilt in-frame. As a result, the engine can be returned to original factory specifications for a lot less than the cost of remanufacturing, which gives it a strong value advantage at resale.

Navistar N9 Specifications

  • Engine Type

    Diesel, 4-Cycle

  • Configuration

    Inline 6-Cylinder

  • Displacement

    9.3 L (570 cu. in.)

  • Bore and Stroke

    4.59 in. & 5.75 in. (11.7 cm & 14.6 cm)

  • Combustion Ratio


  • Aspiration

    Two-Stage Turbochargers, Intercooler & Aftercooler

  • Combustion System

    Direct Injection

  • Lubricating System Capacity

    30 Quarts (28 L)

  • Dry Weight

    1,870 lbs. (848 kg)

  • Dimensions

    L 45 in. x W 42 in. x H 47 in. (L 114 cm x W 107 cm x H 119 cm)

  • Valves

    4 Valves per Cylinder

  • B50 Design Life

    550,000 miles (885,139 km)

  • Change Engine Oil, Replace Oil Filter

    Up to 25,000 miles (24,140 km) / 6 months / 550 hours / 2,100 gallons (7,949 L)

  • Replace Fuel Filter

    30,000 miles (48,280 km) / 12 months / 1,100 hours / 4,200 U.S. gallons fuel

  • Replace Coolant

    300,000 miles (482,803 km) / 5 years / 12,000 hours; Add Extended Life Coolant (ECL) Extender @ 150,000 miles (241,400 km) / 30 months / 6 ,000 hours

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