A-3940059 Bushing; Cam (2.345" O.D.)

One New Aftermarket Replacement Camshaft Bushing (Cam Bushing) for Cummins Diesel Engines

This thick camshaft bushing (cam bushing) supports and journals the camshaft within the engine block, reducing friction and wear on the camshaft bore. It is used in Cummins B-series diesel engines including the 4BT 3.9L, 6BT 5.9L, ISB, and QSB engine families, covering both Storm Block and Common Rail block configurations. The A-prefix part number (A-3940059) is the A&I Products aftermarket designation for OEM Cummins part number 3940059.

Specifications

• Outer Diameter (O.D.): 2.345 in.
• Type: Thick cam bushing / cam bearing
• Material: Metal (iron)
• Sold individually (per bushing)

Compatible Engines

Cummins 4BT 3.9L: 1989 and up, 4-cylinder B-series diesel

Cummins 6BT 5.9L (12V and 24V): 1989-2002 Storm Block and Common Rail configurations

Cummins ISB / QSB 5.9L: 1997.5 and up, Storm Block

Cummins ISB / QSB 6.7L: Common Rail blocks

Cummins ISDE / EQB: Selected B-series applications

Note: For Storm Block applications, Cummins also references superseding number C3940059. Verify block type before ordering.

Replaces Part Number(s):

3940059, A-3940059

Aftermarket Interchange Numbers

Interstate McBee: M-3940059; Cross-reference: 4983253 (6.7L Common Rail variant - confirm application before use), 5298256, 3901306, 151528

New aftermarket replacement part - not remanufactured, not used.