Engine

Engine

Engine Description
The 7.3L diesel engine is:
^ a four-cycle turbocharged V-8 with overhead valves.
^ 7.3 liter (444 cubic inch) displacement.
^ separated into two banks, the right bank numbered 1, 3, 5, 7 and the left bank numbered 2, 4, 6, 8.
^ rated at 250 horsepower for automatic transmission and 275 horsepower for manual transmission.

The cylinder block has been designed to withstand the loads of diesel operations by using:
^ four-bolt main bearing caps.
^ internal piston cooling oil jets.
^ a forged steel crankshaft.
^ heavy-duty forged steel connecting rods.

The piston is:
^ made of aluminum alloy.
^ fitted with an upper keystone compression ring.
^ fitted with a lower rectangular compression ring.
^ fitted with oil control rings.

The piston pins are:
^ a free-floating type permitting the piston pin to move/float freely in the piston pin bore.
^ retained in the piston by piston pin retainers.

The camshaft is:
^ supported by five insert-type camshaft bearings.
^ of the roller camshaft design.
^ driven by the crankshaft through the use of the crankshaft gear and the camshaft gear.

The hydraulic valve tappets:
^ minimize engine noise.
^ maintain zero valve lash.
^ incorporate camshaft follower guides.
^ incorporate a roller follower design that reduces camshaft wear.

The cylinder heads are designed:
^ to incorporate electronically controlled/hydraulically actuated fuel injectors.
^ to locate the fuel injectors in the center of the combustion chambers between the rocker arms
^ with integral high-pressure oil galleries.

The glow plug system is:
^ designed to preheat the cylinders for faster cold weather starts and smoke reduction.
^ controlled by the Engine Control Module (ECM).
^ mounted directly into the cylinder heads.

The optional block heater is:
^ designed to heat the engine coolant and oil for improved cold weather starts.
^ located near the oil filter in the oil cooler.
^ powered by a 120-volt external power source.
^ replaceable but not repairable.

The fuel injection system used on the engine:
^ is controlled by the Powertrain Control Module (PCM).
^ utilizes a two-stage mechanical fuel pump.
^ circulates fuel through a combination fuel filter, fuel heater and water separator assembly.
^ uses eight electronically controlled/hydraulically actuated fuel injectors.
^ maintains operating pressures between 275 - 448 kPa (40 - 65 psi).

The engine lubrication system:
^ is divided into two systems: the low-pressure system lubricates the engine, the high-pressure system actuates the fuel injectors.
^ maintains pressures between 0 - 414 kPa (0 - 60 psi) for the low-pressure system and 4137 - 20,685 kPa (600 - 3,000 psi) for the high-pressure system.
^ is cooled by an engine oil cooler.
^ utilizes an oil pressure sensor and an oil pressure regulator.

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Part 5 Of 5:

7.3L (DIT) Engine

Part 1 Of 3:

Part 2 Of 3:

Part 3 Of 3:

7.3L (DIT) Crankshaft, Camshaft and Piston

Engine Identification
For specific and exact engine identification, an engine calibration code label is affixed to the B-pillar. Refer to the illustration for examples of engine identification labeling.

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Engine Labels