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Cummins ISB 24 Valve (5.9 L) Engines for Sale

Cummins ISB 24 Valve (5.9 L) Engines For Sale

A straight-six turbo-diesel engine first unveiled in 1998, the Cummins ISB 24 Valve replaced its 12-valve 6BT predecessor and brought with it a greater level of power and efficiency. This 5.9 L Cummins engine received a few injection system upgrades which increased power output significantly before this model was retired in 2007, but it made a significant mark on the industry before that happened, and its impact is still felt today.

The Cummins ISB 24 Valve  5.9 L remains a popular engine for light-duty truck applications in particular, and Big Bear Engine Company is pleased to provide Cummins ISB 24 Valve replacement long block for Dodge Ram / Chrysler applications.

5.9 L ISB 24 Valve Long Block Engines

ISB5.9 24Valves Long Block

If you have a Cummins 5.9 L ISB 24 Valve with ancillary parts that still have plenty of life left to give, but whose hard internal parts are rather worn down, then our long block option is perfect as you can simply replace the necessary components like the block, cylinder head, and crankshaft without having to spend extra on the components that you do not need. This is a highly cost-effective option that comes with only a small amount of extra labor to dress the engine out the engine with still working components from your old engine.

Remanufactured Cummins ISB 24 Valve 5.9 Component Builds

Our component builds for the 5.9 L 24 Valve engines consists of a combination of new and remanufactured parts. Usually the blocks, crankshafts and camshafts are remanufactured back to OEM Spec. Depending on the availability of the parts, the blocks, cams, cranks and cylinder heads can be brand new castings. Other ancillary parts such as the bearings, gaskets, piston, rings, seals etc… are all built with a combination of new OEM and aftermarket parts. As a guide, a component build is about 90% OEM, 10 % aftermarket.

Our Dodge ISB 24 Valve 5.9 L engines generally fit a 2003-2007 replacement year Dodge Ram 2500 or 3500. However, the long block is configured for the 1998-2003 VP44 Fuel Pump. The ISB 5.9 L blocks, camshafts, crankshafts and cylinder heads were interchanged throughout the years. If you have a common rail fuel pump check with our sales staff to see if the long block (minus the front cover and gear housing) will work as a suitable replacement.

Our 5.9 L long blocks fits CM550 and work best with the following CPLs:

  • CPL 2683
  • CPL 8164
  • CPL 2684
  • CPL 2685
  • CPL 2617
  • CPL 2686

Long Block Assemblies Include:

  • Cylinder Block
  • Cylinder Head
  • Camshaft
  • Camshaft Gear
  • Followers/Lifters
  • Pistons
  • Gaskets and Bearings
  • Rings
  • Bearings
  • Plugs and Bolts
  • Push Rods
  • Connecting Rods
  • Front Cover
  • Timed Front Gear Train Group
  • Crankshaft
  • Oil Pump
  • Oil Cooler
  • Freeze Plugs and Block Plugs
  • Front Rear and Main Seal
  • Valve Cover
  • Oil pickup tube

Cummins 5.9L ISB 24 Valve Engine Applications

ISB 24 Valve Engine

By far the most common application for Cummins ISB 24 Valve engines is their use in light-duty trucks. Specifically, these engines were used in Dodge Ram pickup trucks starting in 1998, when they replaced the 6BT models.

Over the course of the next 9 years, the Cummins ISB 24 Valve 5.9 L engines received a number of upgrades which made it an even better fit for its application in pickup trucks. In 2003, a Bosch high-pressure common rail injection system added power and torque while cutting down on engine noise, which made the Cummins ISB 24 Valve one of the most popular engines on the market.

Though light-duty trucks eventually transitioned to utilizing ISB 6.7 L engines in 2009, the ISB 24 Valve remains a popular option for those with older trucks or who are less concerned about emissions.

Beyond this most popular application, some may also use Cummins ISB 24 Valve Engines to power step vans, commercial delivery vehicles, and other similar applications. This is a quality unit that has a wide range of potential applications; it’s not hard to see why it was ranked as one of Ward's "10 Best Engines" in 2004, or why many still feel that it deserves such an accolade.

Cummins ISB 24 Valve (5.9 L) Specs

Engine Data

Configuration Inline 6 Cylinder
Displacement 359 cubic inches, 5.9 liters
Bore x Stroke 4.02” x 4.72”
Cylinder Head Material Cast Iron
Engine Block Material Cast Iron
Firing Order 1-5-3-6-2-4
Compression Ratio 16.3:1, 17.2:1 for High Output Models
Aspiration Single turbocharger, air-to-air intercooler
Valvetrain OHV, 4 valves per cylinder, solid lifter camshaft
Weight Approximately 1,150 lbs
Oil Capacity 12 Quarts
Governor Speed 3,200 rpm
Horsepower 235-325HP@ 2,900 rpm
Torque 460-610 lb-ft @ 1,600 rpm
Engine Dimensions 40” L x 24.9” W x 37.9” H


Give us a call today at 844-340-4114 for immediate sales and support for the Cummins 4BT, Cummins 6BT, 6CT, ISC, 855, QSB 4.5 L or CAT 3306. If you have any questions check out our FAQ Page. We are always ready to help or just listen to your crazy off-roading adventures!

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Cummins ISB 24 Valve (5.9 L) Engines Gallery

ISB5.9 24Valves Long Block
ISB5.9 24Valves Long Block
ISB5.9 24Valves Long Block
ISB5.9 24Valves Long Block
Cummins ISB5.9 24 Valves Long Block
ISB5.9 24Valves Long Block
ISB 24 Valve Engine

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