Product Description
If you’re rebuilding or sealing the bottom end of your Cummins 4BT 3.9L or QSB3.9 engine (and select QSB4.5/B4.5C), the genuine Cummins 3802375 Lower Engine Gasket Set is an exact-fit solution designed for durability, leak-prevention and factory precision. This OEM kit uses materials engineered by Cummins to handle B-Series thermal expansion and clamp loads.
With this kit you’ll restore comprehensive lower-engine coverage: oil-pan gasket, timing/front cover seals, water-pump interface gaskets and other assorted lower-end seals—contents vary by engine serial number (ESN) so always verify before installing.
Fitment Details
- Fits Cummins 4BT / 4B3.9 (B-Series) – primary target platform.
- Also fits many QSB3.9 Tier-era engines; some QSB4.5 / B4.5C derivatives — verify by ESN for correct contents.
- Kit supersedes earlier part numbers 3802019 and 3802266 in many builds.
Why Choose This OEM Kit?
- Genuine Cummins part — full factory quality and compatibility.
- One-kit coverage of major lower-engine sealing surfaces — less chance of missing a gasket or seal.
- Designed for bottom-end rebuilds, swap builds or industrial applications where reliable sealing matters.
Cross Reference / Alternatives
When refreshing your bottom end, you may also consider related sealing components for a full job:
- CUMMINS 3802019 OEM LOWER ENGINE GASKET SET – 4BT 3.9L (EARLY)
- CUMMINS 3802266 OEM LOWER ENGINE GASKET SET – 4BT 3.9L (TOP-HAT SEAL STYLE)
- CUMMINS 3802375 OEM LOWER ENGINE GASKET SET – 4BT 3.9L / QSB3.9 (INDUSTRIAL)
FAQ
Will this kit fit my 4BT 3.9L engine?
Yes — part number 3802375 is targeted at Cummins 4BT / 4B3.9 bottom-end rebuilds. However, because kit contents vary by ESN, please verify your engine serial number before ordering.
Does it fit QSB3.9 or QSB4.5/B4.5C engines?
Many QSB3.9 and some QSB4.5/B4.5C engines use this kit, but due to running changes (like top-hat seal designs) you must verify by ESN to ensure the correct kit.
Is this kit suitable for a full rebuild of the engine?
Yes — it covers the lower end (oil pan, timing/front cover, water-pump interface etc.), but for a full rebuild you may also need the upper engine gasket set, front/rear mains, pickup tube O-ring and fasteners.
Are earlier kits acceptable instead?
If your engine ESN corresponds to older designs you might need part numbers 3802019 or 3802266 instead of 3802375. Always confirm via ESN.
| Specifications for CUMMINS 3802375 | |
|---|---|
| Part Number | 3802375 |
| Brand | Cummins |
| Application | 4BT 3.9L / QSB3.9 (select QSB4.5/B4.5C) B-Series diesel engines |
| Contents | Comprehensive lower-engine gasket set (oil pan, timing/front cover, water-pump interface, assorted lower seals) – contents vary by ESN. |
| GTIN | – (not publicly listed) |
| UPC | – (not publicly listed) |
| E-Codes / Emissions | Not applicable (industrial/off-highway engine application) |
| Shipping Info | Shipment size approx 24″ × 17″ × 2.5″; weight approx 3.15 lbs. |
| Prop 65 Warning | WARNING: This product can expose you to chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. For more info visit P65Warnings.ca.gov |
| Cross Reference | 3802019, 3802266 |
