Navistar DT engine

Navistar DT Engine

Automobile Engine
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Navistar DT engine

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The Navistar DT engine family is a line of mid-range inline-6 diesel engines. Withhorsepower ratings ranging from to , the Navistar DT engines are used primarily in medium-duty truck and busapplications, 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 DT 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.

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...
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