Product Description
Interstate-McBee M-3802375 Lower Engine Gasket Set – 3.9L 4BT Cummins (89–98)
OEM-style lower engine gasket set engineered by Interstate-McBee for the 3.9L Cummins 4B/4BT. Ideal for resealing the bottom end during rebuilds and leak repairs. This aftermarket kit delivers a precise fit and durable sealing performance while saving cost versus OEM.
- Complete lower kit: Covers oil pan, front/rear crank seals, gear housing, timing cover and more.
- OEM-equivalent materials: Built to match Cummins specs for long-term reliability.
- Aftermarket value: Interstate-McBee quality at a fraction of OEM list.
- ESN-verified coverage: For 4B3.9 applications; verify by engine serial number when possible.
Specifications
| Interstate-McBee P/N | M-3802375 |
|---|---|
| OEM Cross-Reference | Cummins 3802375 (Lower Engine Gasket Set) |
| Engine Family | Cummins 4B / 4BT / ISB / QSB (3.9L) |
| Typical Vehicle Fitment | 3.9L 4BT conversions & applications (commonly referenced 1989–1998 range) |
| Broader Engine Coverage | 4B3.9 applications approx. 1983–Apr 2003 (verify by ESN) |
What’s Included (Representative BOM)
- Oil pan gasket, gear/cover gaskets, timing housing gasket, cover plate gaskets
- Front & rear crankshaft seal kits
- Fuel/filter head gaskets, pushrod cover gasket, oil cooler core gasket
- Multiple rectangular ring seals, O-rings, grommet seals, washers
- Piston cooling nozzles and pads (where applicable)
Detailed BOM (by McBee P/N)
M-3905595, M-3906697, M-3906698, M-3908096, M-3912473, M-3913994, M-3938157, M-3914385, M-3939355, M-3915772, M-3915800, M-3916042, M-3938156, M-3920773, M-4947667, M-3928759 (x6), M-3283767, M-3938162, M-3939258, M-3929792, M-154916, M-3008400, M-3901020 (x4), M-4089342, M-3902425 (x2), M-3937214 (x4), M-4932124, M-3942915, M-3906696, M-3903475, M-3937111, M-3918673, CG65PAD (x2).
Vehicle / Engine Fitment
Always confirm by Engine Serial Number (ESN) for exact coverage.
- Cummins 3.9L 4B / 4BT lower end reseal applications (commonly referenced: 1989–1998 4BT).
- Industrial / Commercial / Ag / Genset: Broad 4B3.9 coverage (approx. 1983–Apr 2003 production).
Install Notes
- Thoroughly clean mating surfaces and check flatness; remove all old gasket material.
- Follow Cummins service manual for torque specs and sealant requirements.
- Pre-lube crank seals and verify orientation; inspect crank snout and wear sleeves.
Warranty
Interstate-McBee new parts include manufacturer warranty coverage. Contact us with your ESN for the most accurate policy details for this set.
Why Buy From CPP Diesel
- ESN-verified fitment support from real diesel techs
- Fast shipping and hassle-free returns
- Deep catalog for Cummins B-Series engines
