Engine Description

The 7.3L diesel engine is:

• A four cycle turbocharged V-8 with overhead valves
• 7.3 liters (444 cubic inches) displacement
• Separated into two banks, the right bank numbered 1, 3, 5, 7 and the left bank numbered 2, 4, 6, 8
• Rated at 215 horsepower at 3000 rpm

The cylinder block (6010) has been designed to withstand the loads of diesel operations by using:

• Four bolt main bearing caps
• Internal piston cooling oil jet (6C327)
• A forged steel crankshaft (6303)
• Heavy-duty forged steel connecting rods (6200)

The piston, pin and rings (6102) are:

• 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 (6135) are:

• Free floating type permitting the piston pin to move/float freely in the piston pin bore
• Retained in the piston, pin and rings by piston pin retainers (6140)

The camshaft (6250) is:

• Supported by five insert-type camshaft bearings (6A251)
• Of the roller camshaft design
• Driven by the crankshaft through the use of the crankshaft gear and the camshaft gear

The hydraulic valve tappets (6500):

• Minimize engine noise
• Maintain zero valve lash
• Incorporate camshaft follower guides
• Incorporate roller follower design that reduces camshaft wear

The cylinder heads (6049) are designed:

• To incorporate electronically controlled/hydraulically actuated fuel injectors (9F593)
• To locate the fuel injectors in the center of the combustion chambers between the rocker arms (6564)
• With integral high pressure oil galleys

The glow plug system is:

• Designed to preheat the cylinders for faster cold weather starts
• Controlled by the powertrain control module (PCM) (12A650)
• Mounted directly into the cylinder heads
• Activated by the glow plug control module (12B533)

The standard engine block heater (6A051) is:

• Designed to heat the engine coolant and oil for improved cold weather starts
• Located near the oil filter (6731) in the oil cooler (6A642)
• Powered by a 12-volt external power source
• Replaceable but not repairable

The engine is equipped with a closed crankcase ventilation system that:

• Circulates crankcase vapors into the combustion chambers to be burned during the combustion cycle
• Aids in the reduction of emissions levels

The fuel injection system used on the engine:

• Is controlled by the powertrain control module
• Utilizes a two phase fuel pump (9350)
• Circulates through a combination fuel filter, fuel heater and water separator assembly
• Uses eight electronically controlled/hydraulically actuated fuel injectors
• Maintains operating pressures between 21 to 275 kPa (3 to 40 psi)

The engine lubrication system:

• Is divided into two systems; the low pressure system lubricates the engine (6007), the high pressure system actuates the fuel injectors
• Maintains pressures between 0 and 414 kPa (0 and 60 psi) for the low pressure system and 4137 and 20685 kPa (600 and 3000 psi) for the high pressure system
• Is cooled by an engine oil cooler
• Utilizes an oil pressure sensor (9278) and an injection pressure regulator
• Actuates the exhaust back pressure warm-up system integral to the turbocharger