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1984-1998 3.9L/4BT

General engine features:

The B-series features engine bores machined directly into the block (rather than the wet liners used on earlier Cummins engines). It was also set apart by the use of a shallow one-piece head, requiring closer tolerances than in other Cummins products. Manufacture first took place in Rocky Mount, North Carolina, with additional plants soon added in Mexico, Turkey, and Darlington, UK.

Every Cummins powered Dodge Pickup (since initial production in 1989) has come equipped with a turbocharger. It uses a gear-drive camshaft for extra reliability. Also specified is a deep-skirt engine block and extremely strong connecting rods. A Holset turbocharger is used. The original B Series was updated with 24 valves and an electronic engine management system to become the ISB in 1998.

First generation

The 3.9L/4BT Cummins is an engine in the same family as the 5.9 liters (360.0 cu in) Cummins turbodiesels. The 3.9L/4B is an inline four-cylinder turbodiesel that was popular for many step van applications, including bread vans and other commercial vehicles. It has also gained popularity as an engine swap into smaller trucks. The lowest powered 4B produces 55 hp (41 kW).

Cummins B Series Overview:

  • Manufacturer Cummins
  • Also called 4B/6B/6BT/6BTA
  • Production 1984-1998
  • Combustion chamber
  • Configuration I4 and I6 diesel engines
  • Displacement 3.3 liter / 3.9 liter / 5.9 liter
  • Cylinder block alloy Iron
  • Cylinder head alloy Iron
  • Valvetrain 2 Valves per cylinder
  • Combustion
  • Turbocharger Holset Engineering
  • Fuel system Direct injection
  • Management Mechanical
  • Fuel type Diesel
  • Oil system Wet sump
  • Cooling system Water-cooled
  • Dry weight 1100 lbs
  • Display as:

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