MaxxForce®

MaxxForce® 7: Overview

The MaxxForce® 7 is an all-new V-8 turbodiesel that incorporates advanced design elements and components from Navistar’s market-leading I-6 commercial engines. These include a high-pressure common-rail fuel system, dual-stage turbochargers and compacted graphite iron block. Together with our 30 years of V-8 leadership, these features deliver a better performing engine with outstanding power, performance, reliability and fuel economy.

MaxxForce® 7: 360

MaxxForce® 7: Reliability & Durability

Reliability.

The new MaxxForce 7 was designed for maximum reliability and serviceability. More robust components – starting with the high-strength CG Iron block – and reduced connections, meaning more uptime and faster service turnarounds. A new cold-start system assures reliable operation with every turn of the key.

High-Pressure Common-Rail Fuel System.

A major key to MaxxForce 7 performance is its advanced fuel system, which features high injection pressure of 1900 bar (approximately 28,000 psi) for precise fuel dosing, injection timing and optimal combustion. The results: better fuel efficiency, in-cylinder reduction of emissions, and one of the quietest running diesel engines in the industry.

Compacted-Graphite Iron Block.

How can MaxxForce deliver outstanding fuel efficiency, emissions control without SCR, quiet operation and maximum durability? The answer is the industry’s only Class 6–7 CG Iron block. This incredibly strong platform handles the highest fuel pressures that deliver the best fuel combustion and damps vibration and noise. It carries the load without weighing you down.

Strong as a rock, light as a feather.

Because CG Iron is so incredibly strong, castings don't have to be as thick and heavy in order to achieve the desired structural integrity and durability. This results in 45-pound crank weight reduction (net 20-pound engine weight reduction) over a comparable V-8 engine cast from gray iron — which further improves fuel economy.

Dual-Stage Turbo And Advanced Air-Management

MaxxForce 7 engines use regulated dual-stage turbochargers to deliver powerful performance for any job. The smaller, primary turbo responds quickly for immediate take-off at low engine speeds, and the larger, secondary turbo provides peak power at higher speeds and on steep grades.

MaxxForce® 7: Power

The 2010 MaxxForce 7 provides big power in an efficient V-8 package. Ratings have been boosted up to 300 horsepower and 660 lb.-ft. of torque. A new dual-stage turbocharger design and high-pressure common-rail fuel system yield higher peak power for impressive acceleration, grade climbing and towing capability.

MaxxForce® 7: Performance

The industry’s most precise high-pressure fuel injection system features electronically-actuated piezo injectors that deliver up to five independent injections per cycle for smooth, full combustion. This results in low NVH and smooth acceleration for exceptional driveability. The MaxxForce 7 is the quietest V-8 diesel engine in North America, registering only 68.9 dBA in a low idle test.

MaxxForce® 7: Low Cost of Ownership

The MaxxForce 7 offers an affordable business solution when viewed with complete drivetrain and vehicle package. Its advanced fuel and air-management systems provide outstanding fuel economy, especially in city cycle conditions. Combined with exceptional reliability and serviceability, this V-8 provides low cost of ownership over its extended service life.

MaxxForce® 7: Engine Specs and Ratings

• Configuration: V-8
• Displacement: 6.4 L (389 cu. in.)
• Power Output: 220–300 hp (164–224 kW)
• Peak Torque: 560–660 lb.-ft. (762-898 Nm)
• Aspiration: Turbocharged
• Combustion System: Direct Injection
• Dry Engine Weight: 1,225 lbs. (556 kg)
• B50 Life: 350,000 Miles (603,504 km)

MaxxForce® 7: Serviceability

Preventative Maintenance Intervals

• Change Engine Oil, Replace Oil Filter: 10,000 miles (16,100 km) / 350 hours / 1,000 gallons (3,800 L) / 6 months
• Replace Fuel Filter: 30,000 miles (48,280 km)
• Replace Coolant*: 300,000 miles (482,803 km) / 5 years / 12,000 hours
• Valve Lash Adjustment: Not Required
• Crankcase Breather: 60,000 (96,561 km)

*Add extender @ 150,000 miles (241,400 km) / 2.5 years / 6,000 hours