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Navistar DT engine
ManufacturerNavistar International
Production1971-2016 [1]
Displacement360-466-570 cubic inches, 466 cu in (7.6 L)
Cylinder bore4.59 inches
ValvetrainOHV, 2 or 4 valves per cylinder
Turbochargervariable and fixed geometry turbocharged
Fuel systemdirect injection and HEUI (hydraulic electronic unit injection)
Fuel typeDiesel
Power output170-350hp (commercial), 375hp military

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The NavistarDT engine family is a line of mid-range inline-6diesel engines. With horsepower ratings ranging from 170 hp (130 kW) to 350 hp (260 kW), the Navistar DT engines are used primarily in medium-duty truck and bus applications such as school buses, although some versions have been developed for heavy-duty regional-haul and severe-service applications.Prior to 1986, Navistar International, then known as International Harvester Company, used the DT engine in farm and construction equipment.


The Navistar DT diesel engines are of a wet-sleeve design. This means that the cylinder wall (sleeve) is a separately machined part that fits into the cylinder bores cast into the engine block. The cylinder sleeve is in contact with the engine coolant, hence the 'wet'-sleeve.

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Navistar claims that the wet-sleeve design enhances durability because the consistent wall thickness of the sleeve allows for consistent heat transfer, ensuring the cylinders stay round during thermal expansion. Additionally, they state that the hardened cylinder sleeve is more durable and wear resistant than a softer, cast-in wall. Also, the replaceable cylinder sleeves protect the block from damage (e.g. in case of foreign objects entering the cylinder) and can easily be replaced, which Navistar claims enables simpler restoration to original specifications. The wet-sleeve design also allows the engine to be rebuilt easily to factory specifications, sometimes without even removing the engine from the vehicle.

This design is opposed to parent bore engines, where the cylinder walls are machined out of the bores cast into the block. International states that the uneven thickness of the cylinder walls causes the cylinders to become out of round during thermal expansion, increasing wear. Also, damage to the cylinder wall requires more extensive work to repair.

From 1984 until late 1995, the DT engines used a Bosch pump-line-nozzle (PLN) mechanical direct fuel injection system. 1984 through 1992 DTs used a Bosch MW style pump, while the 1993-1995s used a Bosch P style pump, and starting what was called New Generation Diesel engine design, which is still the same basic block design. Mechanical injection was still utilized in trucks up into the 1997 year, but this is rare. In 1994, due to tightening emissions regulations, the engines were redesigned to use electronically controlled unit direct fuel injection. From 1994 to 2004, the engines used HEUI (Hydraulically actuated Electronically controlled Unit Injection) injectors, co-developed by Navistar and Caterpillar Inc. [1] From 2004 to 2009, the engines use International's Electro-Hydraulic Generation Two (G2) unit injectors. N n-dimethylglycine hcl dmg powder.

Current variants[edit]

The Navistar DT engines are currently available in three configurations. These have been updated to comply with the United States Environmental Protection Agency's 2007 emissions regulations. These variants have been renamed to conform to International's new MaxxForce engine brand.

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  • MaxxForce DT: 7.6 L (466 cu in) displacement, bore x stroke 4.59 x 4.68 in (116.5 x 118.9 mm); with horsepower ratings from 210–300 hp (160–220 kW). The MaxxForce DT is available in standard and high torque configurations, which provide extra torque. [2]
  • MaxxForce 9: 9.3 L (570 cu in) displacement, bore x stroke 4.59 x 5.75 in. (116.5 x 146.1 mm); with horsepower ranging from 300–330 hp (220–250 kW). This engine is similar to the MaxxForce DT, but the piston stroke is increased to raise displacement to 9.3 liters. [3]
  • MaxxForce 10: Same displacement as MaxxForce 9, with horsepower ranging from 310–350 hp (230–260 kW). This engine features stronger components, such as steel-crowned two-piece pistons, strengthened engine block, and a titanium turbocharger turbine to cope with the extra power and stress of severe-service and heavy-duty applications. [4]

The engines are also available for defense applications under the MaxxForce D brand. The MaxxForce DT is known as the MaxxForce D7.6I6, and the MaxxForce 10 is known as the MaxxForce D9.3I6. Modifications from the civilian versions include diamond-coated injectors[citation needed] to enable the engines to run on JP-8 fuel.[5]

Electronic injection Variants[edit]

Navistar DT466E
ManufacturerNavistar International
ConfigurationInline-6 wet-sleeved
Displacement466 cu in (7.6 L)
Cylinder bore4.59 in (116.6 mm)
Piston stroke4.68 in (118.9 mm)
Block materialCast iron
Head materialCast iron
ValvetrainOHV 4 valves per cylinder [2]
Fuel systemHEUI (hydraulic electronic unit injection)
Fuel typeDiesel
Dry weight1,425 lbs dry
SuccessorMaxxForce DT
  • DT 530E 530ST (8.7L): available in standard and high-torque configurations. Replaced in 2004 by DT/HT 570, which were replaced in 2007 by the MaxxForce 9 and 10, respectively. Used electro-hydraulic unit injection.
  • DT 466E (7.6L): Introduced in 1994, added electronic control to previous, non-electronic DT 466, superseded by model year 2005-and-later DT 466 with variable geometry turbocharger (see below). Also changed over from mechanical fuel injection to electro-hydraulic unit injection (HEUI).

Mechanical Injection Variants[edit]

  • DT 466 Family, Model A175 and A190.
  • DT 408 (6.7L): a smaller version of the DT family. Used mechanical fuel injection.
  • DT 360 (5.9L): 6 cylinder mechanical injection produced from 1987 to 1994[3]
  • DTA 360: Same as above, but with an aftercooler, the 'A' stands for 'aftercooled'.
  • DTA 466: Same as earlier mechanical-injection DT 466, but with an aftercooler.

Other Variants:

  • Turbo 400 engine: version used in IH farm and construction equipment, with many different sizes.

Update history[edit]

In 2004, the entire DT family of engines was updated to meet 2004 emissions standards set out by the United States Environmental Protection Agency. Changes to the engines included a new turbocharger (called EVRT, for 'Electronic Variable Response Turbocharger') with movable turbo vanes to improve boost and reduce lag, a new, electronically controlled hydraulic unit fuel injection system, cooled Exhaust Gas Recirculation to reduce emissions, and new four-valve cylinder heads. [6]

In 2007, the DT engines were updated once again to comply with stricter 2007 emissions standards. The DT 466, DT 570, and HT 570 engines will be renamed MaxxForce DT, MaxxForce 9, and MaxxForce 10, respectively. New features include closed-crankcase ventilation and new wiring harnesses. The MaxxForce engines are available in model year 2008 International trucks and IC Corporation school buses.

In 2010 the DT engines were updated once again for compliance with 2010 emissions standards. They all received new, twin turbochargers, with higher-rated versions of the MaxxForce DT and all MaxxForce 9 and 10 engines receiving intercooling and aftercooling. Upgrades to fuel injectors, the EGR system, and cooling were also part of the 2010 modifications.

2015 was the final production year for the MaxxForce DT. It was discontinued for 2015, with some buses being built as 2016 models. It continued in the RE for the 2016 model. It was announced on July 22, 2016 that the RE will be produced with the Cummins ISL9 and the DT offering was going away completely.


  • International CXT (DT 466/MaxxForce DT)
  • International 8500 (HT 570)
  • International 7300, 7400, 7500 (DT 466, DT 570, HT 570)
  • International 4300, 4400 (DT 466/MaxxForce DT, DT 570/MaxxForce 9)
  • International 3300, 3800, 3900 bus chassis
  • AmTran Corporation Genesis (1992-2002) (DT 360/DT466/DT466E)
  • AmTran Corporation Volunteer/Conventional (DT 360/DT466/DT466E)
  • IC Corporation FE 300 (DT 466/MaxxForce DT)
  • IC Corporation RE 300 (DT 466/MaxxForce DT, DT 570/MaxxForce 9) [MaxxForce DT discontinued]
  • IC Corporation CE 300 (DT 466/MaxxForce DT) [MaxxForce DT discontinued]

See also[edit]

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References and external links[edit]


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Info Crank Updater Error Firmwareupdater.dmg.zip Windows 10

  1. ^http://www.trucktrend.com/features/1603-navistar-maxxforce-dt466e/
  2. ^http://www.dieselhub.com/tech/dt466.html
  3. ^http://www.agkits.com/international-dt360-engine-data-sheet.aspx

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