Cummins 6BT is a 5.9-liter, inline 6-cylinder

Cummins 6BT is a 5.9-liter, inline 6-cylinder

Common applications

  • Light-duty trucks (like the Dodge Ram)
  • Industrial machinery and equipment, such as excavators, graders, and cranes
  • Generators
  • Motor homes
  • Marine applications
  • Step vans and delivery trucks 

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Description

Description

Cummins 6BT is a 5.9-liter, inline 6-cylinderFor Sale

The Cummins 6BT is a 5.9-liter, inline 6-cylinder, turbocharged diesel engine known for its durability and popularity in various vehicles and industrial machinery. It was first introduced in 1989 and used in Dodge Ram trucks until 2007 but remains in use for applications like generators, construction equipment, and marine vessels. Specifications can vary, so it is important to check the specific model’s documentation for details

The “6BT” in a Cummins engine code identifies a 6-cylinder, B-series engine with a 5.9-liter displacement. Additional letters like “A” (for aftercooled) or “T” (for turbocharged) denote variations, such as the 6BTA which includes both a turbocharger and aftercooler for increased performance. The engine’s specific serial number (ESN) provides the most detailed information for parts and specifications, and can be found on the engine’s data plate or stamped on the engine block.

Engine model and variations
  • 6BT: This is the base model, a 6-cylinder, 5.9-liter engine. It typically features a mechanical injection pump. 
  • 6BTA: This is a more advanced version that includes a turbocharger (“T”) and an aftercooler (“A”), which cools the compressed air before it enters the engine for better performance and efficiency. 
  • 6BT5.9:  This is a more specific way to identify the 5.9-liter displacement, often seen in model numbers like the 6BT5.9-DM for marine applications. 
How to find specific engine details
  • Data Plate: 

    The most comprehensive information is found on the engine’s data plate, which typically includes the Engine Serial Number (ESN), Critical Parts List (CPL), horsepower, and RPM rating. 

    • Location: On many 6BT engines, the dataplate is on the front gear cover. It may also be on the rocker cover or side of the gear housing. 
  • Engine Stamping: If the data plate is missing, the ESN may be stamped directly onto the engine block. 
    Location: A common location is on the left side of the block, above the oil cooler housing. 
  • Decoding the ESN: The Engine Serial Number can be used on Cummins’ website or a quick service database to retrieve the full engine specification sheet. 

    Decoding Example: A serial number like DTCXM812345678 can be broken down as: DTC (engine family), X (build variant), M (manufacturing plant), 81 (month and year of production), and 2345678 (unique sequence number). 

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