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
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