7.3L Power Stroke Diesel

7.3L Power Stroke Specs & Information

The 7.3L Power Stroke diesel was developed as a the replacement for the aging 7.3L IDI. Although the engines share identical displacements, the designs are of completely different nature and it would be incorrect to suggest that the 7.3L Power Stroke was an evolution of the IDI engine family. The Power Stroke is a turbocharged, direct injection diesel engine produced by International Navistar. The "Power Stroke" trademark belongs to Ford Motor Company, and therefore you will only find the 7.3 "Power Stroke" in Ford applications. The engine is based on International's model T444E engine, which is identical save for some slight variances specific to Ford's applications.

 

The 7.3L Power Stroke turbodiesel is characterized by its HEUI (hydraulic electric unit injector) injection system, which uses highly pressurized engine oil as a medium for creating fuel pressure directly in the injector body, as a opposed to a system requiring a typical injector pump. In lieu of an injection pump, the 7.3L Power Stroke utilizes a high pressure oil pump (HPOP) and a low pressure lift pump in order to create fuel pressures up to 21,000 psi. In comparison to the prior mechanical injection system, the transition to HEUI promised improved performance, lower emissions, and better fuel economy stemming from increased fuel atomization and greater control over injection events.

The popularity of Ford's International powered F-Series pickups is distinguishable in its production numbers, which greatly exceeded that of any competing manufacturer's diesel sales. By 1999, 1 million Power Stroke equipped trucks had been delivered to dealerships. As demand soared following Ford's introduction of the Super Duty platform, the 2 millionth 7.3L Power Stroke equipped F-Series rolled off the assembly line in 2002. The 7.3L Power Stroke has earned praise as one of the most popular engines offered in a pickup truck, its name synonymous with reliability and longevity.

A greater demand for fuel economy and significantly lower emissions ultimately led to the retirement of the 7.3L during the 2003 model year. For the 2003 MY, the 7.3L Power Stroke was offered alongside the new, smaller 6.0L Power Stroke. By the beginning of the 2004 MY, the 6.0L Power Stroke had completely replaced the 7.3L.

7.3L Power Stroke Specs

Engine:

7.3L Power Stroke diesel V-8

Years Produced:

1994.5 - 2003 model years

Displacement:

7.3 liters, 444 cubic inches

Block/Head Material:

Cast iron block, cast iron cylinder heads

Compression Ratio:

17.5 : 1

Firing Order:

1-2-7-3-4-5-6 -8

Bore:

4.11 inches (104.4 mm)

Stroke:

4.18 inches (106.2 mm)

Aspiration:

Single turbocharger, wastegated, intercooler introduced for 1999 model year

Injection:

Direct injection, HEUI (hydraulic electronic unit injection)

Valvetrain:

OHV, 2 valves per cylinder

Oil Capacity:

12 - 15 quarts w/ filter, refer to owners manual

Engine Weight:

Approx. 920 lbs dry

Peak Horsepower:

• 210 hp @ 3,000 rpm (intro horsepower rating, 1994 MY)
• 275 hp @ 2,800 rpm (peak horsepower rating, 2003 MY)

Peak Torque:

• 425 lb-ft @ 2,000 rpm (intro torque rating, 1994 MY)
• 525 lb-ft @ 1,600 rpm (peak torque rating, 2003 MY)

 

7.3L Power Stroke Horsepower/Torque Curves

1994 to 1998 7.3L Power Stroke horsepower & torque

1994 to 1998 model year horsepower/torque curves with 7.3L Power Stroke & 7.3L IDI comparison

1999 to 2003 7.3L Power Stroke horsepower & torque

1999 to 2003 model year horsepower/torque curves, 7.3L Power Stroke diesel

International's T444E was employed in applications exceeding 60,000 lbs GVWR, paying homage to the fact that the 7.3L Power Stroke is indeed a medium duty rated engine despite its application in class 3/4 pickups. Though gravely outdated by today's standards, the 7.3L Power Stroke was considered an innovative leader of the industry through the 90's and into the early 2000's. The engines have a B50 life of 350,000 miles, which has proven to be a rather conservative rating.

7.3L Power Stroke Transmission Options

• ZF S5-47 5 speed manual transmission: Optional 1994 to 1998 model years.

• Ford E4OD 4 speed automatic transmission - Optional 1994 to 1998 model years.

• ZF S6-650 6 speed manual transmission - Optional 1999 to 2003 model years.

• Ford 4R110 4 speed automatic transmission - Optional 1999 to 2003 model years.

7.3L Powerstroke Serial Number Location

The serial number of a 7.3L Power Stroke diesel is located on the rear oil cooler pad (driver's side rear of engine, the "pad" is where the oil filter assembly mounts to the engine block). The first 2 digits of the serial number are "7.3", followed by a 4 digit manufacturing designator, and then a 6 digit build number. The sequential build number may be useful in learning more about what components your engine is equipped with, as some items were changed/upgraded throughout the engine's life.