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Built to support repair shops, fleets, and equipment owners with dependable parts sourcing and responsive service.
Qualifying new parts include 1-year coverage. Review the Warranty Policy section for coverage details, claim steps, and exclusions.
Eligible orders may qualify for returns within 90 days. See the Easy Return Policy section for conditions and next steps.
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| Engine Number | 4B3.9, 6C8.3, ISBE CM800, ISBe4 CM850, ISB/ISD6.7 CM2150 SN, NH/NT 855, ISC CM850, ISF2.8 CM2220 F122, ISF3.8 CM2220, ISL CM2150, ISL CM850, ISL9 CM2150 SN, QSL9 CM850(CM2850), ISB4.5 CM2150, ISB/ISD4.5 CM2150 B119, ISB/ISD4.5 CM2150 SN |
| Compatible Engine Brand | For CUMMINS |
| original | 3971876 |
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Official answers about compatibility, package contents, specifications, installation, shipping, and warranty for Idler Pulley 3971876 for Cummin Engine 4B3.9 6C8.3 ISB/ISD4.5 CM2150 ISBE CM800 QSL9 CM850 (SKU: ESY66615).
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Every new aftermarket part from us includes a 1-year warranty. Full terms, coverage, and how to make a claim: Warranty Assistance.
We ship to customers around the world. Orders are sent with our standard courier service—trackable, dependable, and easy to work with. On this product page, use Get Estimate under the price to see shipping cost and estimated delivery for your location. For destinations, rules, and full details, read our Shipping Policy Details.
We want you to be confident in your order. If you are not satisfied, you may qualify for a return or refund within 90 days, subject to conditions. See our Easy Return Policy for eligibility, steps, and exceptions.
