Product Description
Genuine Cummins
Cummins 3928404 — Valve Cover (12-Valve 5.9L)
MPN: 3928404 | Also Known As: rocker/valve cover | Related: 3928405 (valve cover with oil fill hole)
Why This Part
- ✓ OE cover for proper sealing and valvetrain protection.
- ✓ Direct-fit for 1989–1998 5.9L 12-valve B-series (Ram 2500/3500).
- ✓ Durable OEM construction to handle heat and vibration.
- ✓ Works with factory gaskets, bolt seals, and hardware.
OE Fit Stock Replacement Sold Individually
Quick Specs
| Type | Valve (rocker) cover |
|---|---|
| OE Part # | 3928404 |
| Quantity | Sold individually; 12-valve engines use multiple covers. The oil-fill position typically uses 3928405. |
| Material | OEM-grade casting |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1998 | 5.9L Cummins 12-Valve (6BT) | Ram 2500/3500 |
Industrial/Off-Highway: Also used across 4BT/6BT B-series and Euro-2 5.9L B applications—verify by ESN.
Often Paired With
- Valve Cover Gaskets: 3930906 (six required on 12-valve; sold individually)
- Bolt O-Ring Seals: 3910824 (six required)
- Valve Cover Bolt: 3907049 (qty as needed)
- Oil-Fill Cover: 3928405 (with oil fill hole)
What’s In The Box
- (1) Genuine Cummins Valve Cover (3928404)
- Gaskets, bolt seals, and hardware sold separately.
Install Tips
- Clean mating surfaces; replace gasket and bolt O-rings.
- Torque fasteners to spec and recheck after heat cycle.
- If covers are mixed (OE + aftermarket), check oil-fill cap fitment.
FAQ
WILL THIS FIT MY 1989–1998 5.9L 12-VALVE RAM?Yes—3928404 is an OE valve cover used on 1989–1998 5.9L 12-valve (6BT) applications. Always verify by VIN/ESN if components were changed.
WHICH COVER HAS THE OIL-FILL HOLE?The oil-fill position typically uses Cummins part 3928405. This 3928404 listing is the non-fill cover.
HOW MANY GASKETS AND SEALS DO I NEED?12-valve engines use six valve cover gaskets (3930906) and six bolt O-ring seals (3910824)—one set per cover.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3928404 valve cover.
DOES THIS FIT 24-VALVE OR COMMON-RAIL ENGINES?No—this listing targets 12-valve 5.9L engines. 24-valve/CR engines use different cover designs.
