Dodge Cummins 1st Generation 5.9

R and M Diesel Services
Dodge Cummins Specialist since 1989.Dodge Diesel Cummins Specialist of Little Rock, Arkansas

Performance Enhancements for the 1st Generation 5.9 Cummins Diesel

The 5.9 liters (360.0 ci) ISB (Interact System B) direct injected diesel engine Dodge installed went into production by Cummins in late 1984 for such heavy-duty applications as combines, tractors, road graders, loaders, cranes, and crawlers.

One buyer remarked that he bought a Cummins engine which happened to be in a Dodge pickup truck. The Cummins option was limited to 3/4 and One-ton D/W250 and D/W350 pickups and chassis cabs with a Getrag 5-speed O/D manual transmission, a 3-speed automatic was optional.

In 1991, Dodge made several changes in the Rams with the Cummins diesel:

  • The vacuum pump switched from dual-diaphragm to a vane type
  • Two 750 amp batteries replaced the single 1,025 amp battery
  • A new engine controller, SBEC II, was added; it controlled the intake manifold heater, wait-to-start timer, water-in-fuel sensing system, cruise, and transmission overdrive shift (on trucks with automatic transmissions)
  • Midyear, an air-to-air intercooler was added to cut NOx emissions
  • Midyear, the A518 four-speed automatic was used with the intercooled diesel, in Rams with a conventional cab

Know what your Cummins Diesel Engine Fault Code Means.
Dodge 5.9L 1st Generation Fault Codes for Cummins ISB Diesel Engines.


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 We are an aftermarket repair, ECM tuner and rebuilder, all aforementioned names, logos and trademarks shown on our website are owned by the respective companies.

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