Replacement Ribbed Belt for Cummins ® B/ISB/QSB Applications

1 x Belt / Length 56.5″ – 3929330

Fits Application: Cummins 6B /4B / ISB

Application & Fitment

• Engine Make: Cummins
• Engine Model / Application: B/ISB/QSB

Confirm the original part number and engine identification before ordering. Where applicable, also verify serial-number range, production year, piston style, bearing size or other configuration notes shown in the product information.

Part Numbers & Cross References

• Interstate-McBee Reference: M-3929330

Need Help Confirming Fitment?

Use the engine model, serial number and original part number when checking compatibility. For kits and sets, review the complete component breakdown above before ordering because contents can vary by engine configuration.