24 Valve Cummins Turbo Diesel

Improvements and design changes to the ISB

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What is an ISB engine?

• ISB is the Cummins designation for the new electronically injected Interact System B(5.9L 6 cyl) engine .
• ISB engines were introduced into the Ram on Jan 9, 1998
• The ISB uses a centrally mounted injector and a symmetric combustion chamber for cleaner combustion.
• Details can be found on the Cummins ISB features page.
• The ISB is a 24 valve engine (4 per cyl), the earlier engines are now often referred to as 12 valve.
• ISB routine service intervals for new owners posted to the Cummins list from Powermaster

Engine Details

Source: Chrysler Master Tech Issue 2 Reference Book - dated February 1998

Dodge Ram trucks continue to maintain a well-deserved reputation for being hard working, durable, and above all, ruggedly powerful. When you add a legendary Cummins diesel engine to the picture, the result is an outstanding combination of performance and dependability that sets the Ram pickup apart from the other trucks in its class.

This is an in depth look at the many enhancements to the diesel power plant, including the most obvious changes such as the new 24 valve cylinder head and valve train, and the Bosch VP44 fuel injection pump.  Also covered are new items on the lower end of the engine and its lubrication system, the new fuel system, and intake and exhaust systems.

RATINGS AND IDENTIFICATION

Manual transmission equipped Rams are rated:

• 235 hp @ 2700 rpm,  460 lb-ft @ 1600 rpm

• 215 hp @ 2700 rpm, 420 lb-ft @ 1600 rpm

As an aid to identification, the engine serial number is stamped in the block on the vertical surface above the oil cooler (Fig 3). This number and other information can also be found on the data plate attached to the gear housing.