Product Description
The Cummins 4376091 OEM Lower Engine Gasket Kit is the complete, genuine bottom-end sealing package for 2013–2018 ISB 6.7L Cummins engines. This kit includes all essential OEM gaskets and seals required when servicing or rebuilding the lower engine assembly — ensuring leak-free performance, proper crankcase sealing, and long-term reliability. Using genuine Cummins components ensures correct material composition, perfect fitment, and durability far beyond aftermarket alternatives.
Ideal for oil pan removal, bearing service, lower block resealing, front cover repair, or complete engine overhaul, the 4376091 lower gasket kit is the trusted choice for professional rebuilders and diesel technicians.
Fitment
- 2013–2018 Ram 2500 / 3500 / 4500 / 5500 with 6.7L ISB Cummins
- 2013–2018 commercial chassis & vocational equipment using the ISB 6.7L platform
- ISB 6.7 engines configured with OEM lower end gasket system matching kit 4376091
Note: Always verify by engine serial number (ESN) to ensure exact application compatibility.
Cross-Reference (Cummins-Only)
Related OEM Cummins sealing components commonly serviced with this lower gasket kit:
• Cummins 3900267 Tappet Cover Bolt Grommet Seal
• Cummins 3915787 Oil Filter Housing Threaded Plug
• Cummins 3900625 Hex Flange Head Cap Screw
FAQ
What does the Cummins 4376091 lower gasket kit include?
It typically contains oil pan gaskets, front cover gaskets, rear seals, crankcase seals, and other lower block sealing components engineered specifically for ISB 6.7L engines.
Does this kit fit any 6.7L Cummins from 2007.5+?
No. This kit is specifically correct for 2013–2018 ISB 6.7L. Earlier engines use different gasket configurations.
Is this an OEM Cummins kit or aftermarket?
This is a 100% genuine Cummins gasket kit — not aftermarket or reproduction.
Should I replace the rear main seal during a bottom-end reseal?
Yes. Any time the lower end is opened, Cummins recommends replacing the rear main seal for long-term leak prevention.
Do I need any additional gaskets beyond this kit?
This kit covers the lower engine. If resealing the top end, order a matching upper gasket kit compatible with your ESN.
Specifications for cummins 4376091
| Specification | Value |
|---|---|
| Brand | Cummins Genuine Parts |
| Part Number | 4376091 |
| Component Type | Lower Engine Gasket Kit – ISB 6.7L |
| UPC | Not Published |
| GTIN | Not Published |
| Cross Reference | Supersedes earlier ISB lower gasket kits depending on ESN |
| E-Codes | N/A |
| Shipping Weight | 3–5 lbs (varies by packaging) |
| Package Dimensions | 20 x 14 x 4 in (approx.) |
| Prop 65 Warning | Not Applicable |
