Product Description
Interstate-McBee M-3802375 Lower Gasket Set – 89–98 3.9L Cummins 4BT
Complete lower engine gasket kit for the 1989–1998 3.9L Cummins 4BT. Designed as an OE-style replacement to restore reliable sealing on bottom-end and front cover components. Aftermarket replacement. Sold as one complete set.
- Purpose-built: Covers the lower engine—ideal for refreshes, leak repairs, and overhauls.
- OE-style materials: Gaskets engineered for proper sealing and long service life.
- Straightforward install: Sized to factory dimensions for consistent fit.
- Value: Interstate-McBee quality without OEM boxed pricing.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3802375 |
| Engine | 3.9L Cummins 4BT (8-valve) |
| Model Years | 1989–1998 (verify by ESN for best accuracy) |
| Kit Type | Lower gasket set |
| Sold As | Complete set |
Typical Contents
Contents can vary by production revision. Always review the contents image/listing on this page and verify by engine serial number (ESN).
- Oil pan gasket
- Front cover/timing cover gaskets and seals
- Rear cover/housing gaskets
- Water pump and coolant passage gaskets (as applicable)
- Accessory and miscellaneous lower-end gaskets & O-rings
What’s Not Typically Included
- Head gasket and upper-engine gaskets (use an upper or full set if needed)
- Valve stem seals
- Hardware/fasteners
Fitment
- Cummins 3.9L 4BT industrial and automotive applications where M-3802375 applies
- Years: 1989–1998 (confirm by ESN)
Install Notes
- Clean all sealing surfaces; remove old RTV and debris.
- Follow torque specs and patterns from the Cummins service manual.
- Use appropriate sealants only where specified by the manual.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping, easy returns, competitive pricing
- Deep inventory of 4BT/6BT gaskets, seals, and overhaul parts
FAQ
Is this the right kit if I’m doing a full rebuild?
This is a lower set. For a complete rebuild, pair it with an upper or a full engine gasket set.
How do I verify fitment?
Use your Cummins engine serial number (ESN). If you’re unsure, contact us and we’ll confirm the correct set before you order.
Does this include seals?
Some seals and O-rings for the lower end may be included depending on revision. Check the contents shown on this page for the exact components.
