5.9L 24-valve Cummins ISB

 

In 1998, the BT 5.9 was redesigned as a 24 valve engine to updated emission requirements. ISB stands for Interact System B. The ISB featured a Bosch VP44 rotary injection pump until 2003, when the injection system was upgraded to a Bosch high pressure common rail fuel injection system, which increased power output. In 2001, a high output (HO) version of the ISB became available, which slightly increased the ouput of manual transmission equipped trucks. A 610 version of the ISB became available which pushed torque to 610 lb-ft. The 5.9L Cummins was replaced by the 6.7L mid model year for 2007.

5.9L Cummins ISB Specs

• 5.9L 12v Cummins Specs

• 6.7L Cummins Specs

• Cummins 4BT Specs

• #53 5.9L Cummins Block

• 48RE Transmission Specs

• 47RE Transmission Specs

• Cummins Output Timeline

• Cummins QSB 4.5L

 

5.9L Cummins Specs:

Displacement:	359 cubic inches, 5.9 liters
Configuration:	Inline 6 cylinder
Firing Order:	1-5-3-6-2-4
Compression Ratio:	16.3:1, 17.2:1 (high output version)
Bore:	4.02 inches
Stroke:	4.72 inches
Injection:	Direct Injection • 1998.5 - 2002: Electronically controlled Bosch VP44 rotary injection pump. • 2003-2007: Bosch high pressure common rail injection.
Aspiration:	Holset turbocharger
Valvetrain:	OHV, 4 valves per cylinder, solid lifter camshaft
Oil Capacity:	12 quarts
Weight:	Approx. 1,150 lbs
*Horsepower:	235 - 325 HP @ 2,900 RPM
*Torque:	460 - 610 lb-ft @ 1,600 RPM
Governed Speed:	3,200 RPM
Years of Operation:	1998.5 - 2007

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*Output varies with model year.

 

5.9L Cummins ISB Info

• ISB is the acronym for Interact System B.
• Assembled at the Cummins Columbus, Indiana assembly plant; the same city in which "Cummins Engine Company" was founded.
• All fuel systems on the 24v Cummins were electronically controlled, including the years that the it used a mechanical injection pump.
• Does not use glowplugs, but rather a heater grid mounted beneath the air horn.
• The VP44 injection pump failure rate was much higher than that of the P1700 that was used on the 6BT (12v).
• Used forged steel connecting rods for strength.
• The 5.9L ISB made Ward's 10 Best Engines list in 2004.
• Power output on automatic equipped Cummins powered Rams was slightly downrated for the manual transmission equipped Rams from 1998 - 2001.
• Production of the 5.9L Cummins ended completely in June 2009.