Drive belt illustration – not the actual part
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Drive belt illustration – not the actual partDiesel Parts Direct logo

Aftermarket parts may appear slightly different, including the packaging.

Cummins4BT / 6BTBelts

DS-4941258 Engine Belt For Cummins Engines

Compatible With 4B3.9, 6B5.9, ISB, and ISB3.9 Engines

OEM #: 4941258SKU: DS4941258
$106.50

Taxes and Shipping are calculated at checkout

Special Order Item - not eligible for return

This is an Engine Belt for 4B3.9, 6B5.9, ISB and ISB3.9 Cummins Engines. This construction matches the OEM to assure a quiet and smooth functioning belt, with the same performance and durability as the OEM part.

  • Reduces noise, vibration and harshness (NVH).
  • Extends life of the belt and other accessory drive components.
  • Exact OEM aramid cord construction replacement - superior to polyester tensile cords that most serpentine belts come with.
  • Essential for specific demanding accessory belt drives (Turbo, Diesel, high RPM).
SKU DS4941258
OEM Number 4941258
Part Type Belts
OEM Brand CUMMINS

Aftermarket warranty

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  • Orders are processed the same or next business day
  • Expedited shipping options available at Checkout
  • If same-day shipping is critical, please call to confirm availability

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Call any of our friendly Parts Dept. Specialists with your engine serial number, and we can quickly verify whether this part is the correct part for your engine — no guesswork.

Phone: 888.687.0539

Don't know how to find your engine serial number? Go to our Engine Help Center for assistance.