International® A26 Big Bore Engine

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A NEW ENGINE DEMANDED NEW THINKING.

We call it Project Alpha — a new approach to uptime. We pulled in our best powertrain engineers to build upon the most trusted and proven components. The result is the A26.

Go behind the scenes of Project Alpha.

Darren Gosbee

VP, Powertrain Engineering

By launching Project Alpha, Darren Gosbee encouraged his team to utilize the latest thinking, processes, methodologies, and concepts to create an entirely new type of engine with the A26.

See why Darren thinks the A26 is the next step forward.

Jim Nachtman

Lead Design Engineer

In his quest to deliver the greatest uptime possible in an engine, Jim Nachtman and his team followed a simple philosophy – what’s the best it can be and how can we get there. By simplifying many of the systems that go into the A26, they were able to create the lightest engine in the marketplace.

See how Jim helped create a leader in the marketplace.

Millions of miles of testing. Zero left to chance.

Tested and validated to new industry standards.

DYNO

Hundreds of thousands of dyno testing hours

ROAD

Millions of real-world test miles

TEST UNITS

Hundreds of engines tested

See how we put the all-new A26 to the test.

BUILT FROM THE BLOCK UP

Based on the MAN® D26 engine platform, then perfected for the North American market.

Build Your Truck Download Brochure

Backed by the industry's best in class 2 year, unlimited mile, unlimited hour warranty.

At 2,299lbs, it’s the lightest engine in its class.

The A26’s uniquely sculpted crankcase, which is isolated from the oil pan through a specially designed rubber gasket absorbs vibration and reduces harshness for a quieter in-cab experience.

Up to 5% more fuel-efficient than the 2017 N13 engine.

Backed by the industry's best in class 2 year, unlimited mile, unlimited hour warranty..

At 2,299lbs, it’s the lightest engine in its class

The A26’s uniquely sculpted crankcase, which is isolated from the oil pan through a specially designed rubber gasket absorbs vibration and reduces harshness for a quieter in-cab experience.

Up to 5% more fuel-efficient than the 2017 N13 engine.

Features a low friction coating for increased fuel economy and larger piston pin and connecting rod for optimal load distribution and durability.

New Piston Assembly

Features a low friction coating for increased fuel economy and larger piston pin and connecting rod for optimal load distribution and durability.

Higher strength and more fatigue resistant than traditional gray iron because of its thinner walls that reduce weight and maximize payload. Sculpted to dampen vibration for a quieter in-cab experience.

COMPACTED GRAPHITE IRON (CGI) CRANKCASE

Higher strength and more fatigue resistant than traditional gray iron because of it’s thinner walls that reduce weight and maximize payload. Sculpted to dampen vibration for a quieter in-cab experience.

Its new design achieves the perfect balance between weight, strength, cooling and breathing, leading to better uptime and fuel economy.

CYLINDER HEAD

Its new design achieves the perfect balance between weight, strength, cooling and breathing, leading to better uptime and fuel economy.

EGR COOLER

Stainless steel, laser welded, single stage EGR cooler delivers proven durability and performance, in a compact, easy-to-service design.

Gear teeth are produced using a grinding process for smoother, harder gear surfaces that create less noise.

GEAR TRAIN

Gear teeth are produced using a grinding process for smoother, harder gear surfaces that create less noise.

A New Engine Deserves A Best-In-Class Warranty.

We stand behind the A26 with a two-year unlimited hours or miles warranty that lets you take it as far as you want, for as many hours/miles as you want. Go ahead, go the extra mile.

Industry-Leading Service Intervals

The A26's design allows for increased service intervals keeping you on the road longer.

Oil Change: Now up to 70,000 miles.*
*With oil sampling and International Truck approval.

Diesel Particulate Filter Cleaning: Now up to 600,000 miles*
*With greater than 6.5 mpg

BEST-IN-CLASS B10 LIFE

International B10 standards require 90% of all engines to endure 1.2 million miles before an engine rebuild is required.

Specifications

The A26 is packed with efficient muscle and built to set a new standard in its class.

Download Specs

HP @ 1700 RPM	Torque [ft*lb] @ RPM	Governed speed [RPM]	High idle speed [RPM]
365*	1250 @ 1000	2100	2200
370*	1350 @ 1000	1800	2000
400	1550-1750 @ 975	1800	2000
410	1450 @ 1000	1800	2000
410	1450-1650 @ 1000	1800	2000
430	1550 @ 1000	1800	2000
450	1700 @ 1000	1800	2000
450	1550-1700 @ 1000	1800	2000
475	1700 @ 1000	1800	2000

*Rating not available in LT® Series

HP @ 1700 RPM	Torque [ft*lb] @ RPM	Governed speed [RPM]	High idle speed [RPM]
365*	1250 @ 1000	2100	2200
370	1350 @ 1000	2100	2200
390	1450 @ 1000	2100	2200
410	1450 @ 1000	2100	2200
430	1550 @ 1000	2100	2200
450	1700 @ 1000	2100	2200
475	1700 @ 1000	2100	2200

*365 rating is not available in HX Series.

Engine Type	Diesel, 4-Cycle
Configuration	Inline 6-Cylinder
Displacement	12.4 L (758 cu. in.)
Bore & Stroke	4.96 in. & 6.54 in. (126 mm & 166 mm)
Compression Ratio	18.5:1
Aspiration	Variable Geometry Turbocharger with Charge Air Cooler
Combustion System	2500 bar High Pressure Common Rail
Engine Lubrication	42 Quarts (40 L)
Total Engine Weight	2,299 lbs. (1043 kg)
Valves	4 Valves Per Cylinder, Single Overhead Camshaft
B10 Design Life	1,200,000 mi (1,931,000 km)

Replace Engine Oil and Oil Filter	Up to 70,000 miles with oil sampling and International Truck approval Greater than 6.5 mpg: 50,000 miles (80,000 km) 5.5 to 6.5 mpg: 35,000 miles (56,000 km) Less than 5.5 mpg: 20,000 miles (32,000 km), 500 hours, or 6 months
Replace Fuel Filter	At every oil change or 1,300 hours
Diesel Particulate Filter Cleaning	Greater than 6.5 mpg: 600,000 miles / 11,000 hours 5.5 to 6.5 mpg: 500,000 miles / 9,000 hours Less than 5.5 mpg: 350,000 miles / 9,000 hours
Replace DEF Filter	300,000 miles (483,000 km)
Add Extended Life Coolant Extender	600,000 miles (966,000 kilometers)
Replace Coolant	1,200,000 miles (1,931,000 km) / 8 years / 15,000 hours
Adjust Valve Lash	For normal service vehicles with an annual mileage over 30,000 miles (48,000 km): At 120,000 miles (193,000 km), at 300,000 miles (483,000 km), then every 300,000 miles (483,000 km) For severe service applications that average up to 30,000 miles (48,000 km) per year: At 1,000 hours, at 3,000 hours, then every 3,000 hours

ONE BEST-IN-CLASS ENGINE.
FOUR WORLD RENOWNED TRUCKS.

This A26 engine represents the best of who we are and what our vision is. So it makes sense that we're putting it in the world's most driver-centric trucks that do the same - starting with the uncompromising International® LT®, RH™, HX™ and HV™ Series.

Download LT® Brochure Download RH™ Brochure Download HX™ Brochure Download HV™ Brochure

ONE BEST-IN-CLASS ENGINE.
FOUR WORLD RENOWNED TRUCKS.

Download RH™ Brochure Download LT® Brochure

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A26

INTRODUCING THE INTERNATIONAL® A26 BIG BORE ENGINE.

BORN FROM A NEW WAY OF THINKING. BUILT WITH UPTIME IN ITS DNA.

A NEW ENGINE DEMANDED NEW THINKING.

Darren Gosbee

VP, Powertrain Engineering

Jim Nachtman

Lead Design Engineer

Millions of miles of testing. Zero left to chance.

DYNO

ROAD

TEST UNITS

BUILT FROM THE BLOCK UP

A New Engine Deserves A Best-In-Class Warranty.

Industry-Leading Service Intervals

BEST-IN-CLASS B10 LIFE

Specifications

INTRODUCING THE INTERNATIONAL® A26
BIG BORE ENGINE.

BORN FROM A NEW WAY OF THINKING.
BUILT WITH UPTIME IN ITS DNA.