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.
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.
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.