Part number lookup
3978021 Replacement Parts
Cross-reference and compare 1 replacement listing for OEM / aftermarket part number 3978021. Use this part-number page — not a generic equipment or brand hub — to review price, availability, and fitment before ordering.
1 Matching Product
Part Numbers and Cross References
Applications and Fitment Summary
- Cummins · s: Fit for Engine: Cummins 4BT, 4BTA, 6CT, 4B3.9, 6B5.9, B4.5 CM2350 B146C, B5.9 G, B5.9 GAS PLUS CM556, B5.9 LPG PLUS CM556, ISB CM850, ISC8.3 CM2250, QSB4.5 CM2250 EC, QSB4.5 CM2350 B106, QSB4.5 CM850(CM2850), QSB5.9 30 CM550, QSB5.9 CM850, QSB6.7 CM850(CM2850), QSK95 CM2350 K143C, QSL9 CM850(CM2850)
Frequently Asked Questions
What parts replace OEM number 3978021?
This page lists 1 replacement listing indexed under 3978021. Compare cross references, applications, and pricing before ordering.
How do I confirm fitment for 3978021?
Match the stamped part number first, then verify machine model, engine code, serial number, mounting points, and photos of your old part before checkout.
Can I request a quote if 3978021 is not an exact match?
Yes. Use the fitment inquiry form with your machine plate, engine model, and photos. Support can review alternatives or cross references.