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Description
Idler Pulley 3971876 for Cummins 4B3.9 6C8.3 ISB/ISD4.5 CM2150 ISBE CM800 QSL9 CM850Replacement part number: 3971876 Application: Fit for Cummin Engine: 4B3. 9, 6C8. 3, ISB ISD4. 5 CM2150 B119, ISB ISD4. 5 CM2150 SN, ISB ISD6. 7 CM2150 SN, ISB4. 5 CM2150, ISBE CM800, ISBE4 CM850, ISC CM850, ISF2. 8 CM2220 F122, ISF3. 8 CM2220, ISL CM2150, ISL CM850, ISL9 CM2150 SN, NH NT 855, QSL9 CM850(CM2850)
Replacement part number:
3971876
Application:
Fit for Cummin Engine:
4B3.9, 6C8.3, ISB/ISD4.5 CM2150 B119, ISB/ISD4.5 CM2150 SN, ISB/ISD6.7 CM2150 SN, ISB4.5 CM2150, ISBE CM800, ISBE4 CM850, ISC CM850, ISF2.8 CM2220 F122, ISF3.8 CM2220, ISL CM2150, ISL CM850, ISL9 CM2150 SN, NH/NT 855, QSL9 CM850(CM2850)
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 8 reviews
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Product Reviews
★★★★★ 5
Great product!
I would buy it again, super effective!
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Reviewed in the United States on November 7, 2025
★★★★★ 5
Fits my Accord
Simple easy install for my 2016 Accord. No changes in sound, no changes in how my vehicle runs. Nice it’s 18k miles.
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Reviewed in the United States on November 4, 2025
★★★★★ 5
Great
Great
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Reviewed in the United States on April 17, 2026
★★★★★ 5
OEM quality and perfect fit with no leaks
Size: 1 Count
This is the real deal for anyone wanting to stick with OEM parts for their Chrysler or Dodge vehicle. The filter arrived sealed and well-packaged, and installation was quick with no surprises. This fits my 2016 Chrysler 300 sedan.
It fits perfectly and performs just like the one from the dealership but without the inflated price. There were no leaks, and oil pressure stayed consistent post-change.
If you're doing your own oil changes, it’s worth sticking with a filter that’s built specifically for your engine - this one does the job right.
Pros:
True OEM fit and function
Well-sealed and clean install
Performs reliably
Tip: Pre-fill the filter with oil before installation to reduce dry start wear and improve circulation right away.
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Reviewed in the United States on June 26, 2025
★★★★★ 5
Mopar Quality
Size: 1 Count
I regularly buy Mopar filters for my vehicles and have never had a problem with them. These are great filters at a good price and of course it is very convenient buying on Amazon.
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Reviewed in the United States on October 20, 2025