Menu
Search
888.687.0539

Our office will be closed 9/7/2026 in observance of Labor Day. Orders placed during this time will be processed when our office opens 9/8/2026.

Our office will be closed 9/7/2026 in observance of Labor Day. Orders placed during this time will be processed when our office opens 9/8/2026.

Search by Part Number Close
Shopping cart Close

You have no items in your shopping cart.

Menu Close

Cummins 4BT/6BT Belt Tensioners

Belt Tensioner for Cummins 4NT/6BT Engines

We stock belt tensioners for Cummins 3.9 and 5.9 liter engines. For your convenience, you can access our inventory through the product links listed below.

If you do not see the part you are looking for, please use our quote request form or call us at 888.687.0539: our knowledgeable sales staff will gladly help you.

3974102

BELT TENSIONER - 4B3.9 / B4.5 / 6B5.9 / B6.7 / ISB / QSB

Genuine Cummins Part

$274.82

3976834
Restocking Fee Applies

BELT TENSIONER - 4B3.9 / B4.5 / 6B5.9 / B6.7 / ISB / QSB

Genuine Cummins Part

$246.58

4981116

BELT TENSIONER - 4B3.9 / B4.5 / 6B5.9 / B6.7 / ISB / QSB

Genuine Cummins Part

$317.88

5259022
Restocking Fee Applies

BELT TENSIONER - 4B3.9 / B4.5 / 6B5.9 / B6.7 / ISB / QSB

Genuine Cummins Part

$251.42

5270678

BELT TENSIONER - 4B3.9 / B4.5 / 6B5.9 / B6.7 / ISB / QSB

Genuine Cummins Part

$265.93

5333478

BELT TENSIONER - 4B3.9 / B4.5 / 6B5.9 / B6.7 / ISB / QSB

Genuine Cummins Part

$244.82

5333480

BELT TENSIONER - 4B3.9 / B4.5 / 6B5.9 / B6.7 / ISB / QSB

Genuine Cummins Part

$296.54

DS-3937553
Hassle-Free Return Item

BELT TENSIONER - B SERIES / ISB / QSB

$145.09

DS-3937556

BELT TENSIONER - 4BT3.9 / 6BT5.9 / ISB3.9 / ISB4.5 / QSB3.9

$88.02

DS-3978021

BELT TENSIONER - B SERIES

$93.32

DS-5333480

BELT TENSIONER - 4B3.9 / B4.5 / 6B5.9 / B6.7 / ISB / QSB

$214.25

888.687.0539 (U.S.)|225.706.4858 (Int.)

Monday-Friday 7am-5pm CST
8784 S. Choctaw Dr. Baton Rouge, LA 70815
company information
Resources
Returns

Payment options

Complete your payment with a Visa card Complete your payment with a Master card Complete your payment with an American Express card Complete your payment using PayPal
Diesel Parts Direct BBB Business Review

Caterpillar® and all of the Caterpillar® engine models listed on this website are registered trademarks of Caterpillar, Inc. Cummins® and all of the Cummins® engine models listed on this website are registered trademarks of Cummins. Detroit Diesel® and all of the Detroit Diesel® engine models listed on this website are registered trademarks of Daimler AG. John Deere® and all of the John Deere® engine models listed on this website are registered trademarks of John Deere. Allison Transmission® and all of their transmission models listed on this website are registered trademarks of Allison Transmission®. Diesel Parts Direct is not an authorized dealer for Caterpillar, Cummins, Detroit Diesel, John Deere, or Allison Transmission. None of the parts beginning with "DS" or "R" are genuine Caterpillar, Cummins, Detroit Diesel, John Deere, or Allison Transmission items.

Copyright © 2026 Diesel Parts Direct. All rights reserved.
CID: 2