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For 1987, a larger 7.3 L version of the IDI was introduced. [7] This engine features numerous improvements over the 6.9, with most of the changes located in the heads; the block received an increased bore and select-fit pistons, while the heads received an enlarged prechamber, enlarged valve stem shields, harder valves, and other minor upgrades.
Pumpe Düse (PD) direct injection (DI): engine-driven vane-type low-pressure fuel lift pump, four camshaft-actuated (via roller rocker arms) high-pressure 2,200–2,400 bar (31,910–34,810 psi) Unit Injectors with solenoid valve injection nozzles Bosch or Unit Injectors with piezo valve injection nozzles Siemens VDO (engines 125 kW and BKP ...
The T444E was manufactured from 1994 to 2003, replacing the 7.3L IDI V8 designed by International Harvester. As a result of its inability to meet California noise regulations, the T444E was discontinued midway through the 2003 model year , replaced by the all-new 6.0L VT365 .