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Aftermarket parts may appear slightly different, including the packaging.

Cummins4BT / 6BTBelt Tensioners

Cummins 3974102 Belt Tensioner

Compatible With 4B3.9, B4.5, 6B5.9, B6.7, ISB, and QSB Engines

Genuine Cummins Part

OEM #: 3974102SKU: 3974102

Ships in 1-2 days

$312.30

Taxes and Shipping are calculated at checkout

Special Order Item - not eligible for return

SKU 3974102
OEM Number 3974102
Part Type Belts, Tensioners
OEM Brand CUMMINS

Warranty

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Genuine Cummins parts warranty

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  • Orders are processed the same or next business day
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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.