Product Description
Cummins 3928405 — Valve Cover w/ Oil Fill (4BT/6BT 5.9L 12V)
MPN: 3928405 | Also Known As: valve cover, rocker cover, valve chamber hood | Notes: Used widely on B-Series 3.9L/5.9L; Cummins indicates Euro-2 5.9B coverage (verify by ESN).
Why This Part
- ✓ OE casting for proper sealing and long service life.
- ✓ Oil-fill provision integrated into the cover.
- ✓ Fits common 4BT/6BT (12-valve) applications; ideal refresh during top-end service.
- ✓ Direct-fit for many 1989–1998 Dodge/Ram 5.9L 12V builds (confirm by ESN/cover style).
Quick Specs
| Type | Valve (rocker) cover with oil-fill port |
|---|---|
| OE Part # | 3928405 |
| Quantity | 1 per engine (sold individually) |
| Common Pairings | Cover gasket, oil-fill cap & seal, center bolt & isolator |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1998 | Cummins 5.9L 12-Valve (6BT) | Dodge/Ram 2500 & 3500 |
Industrial/Off-Highway: Common on 4BT 3.9L & 6BT 5.9L B-Series platforms. Always verify by ESN and cover style before ordering.
Compatibility notes: Not for 24-valve (1998.5–2002) or 2003+ common-rail engines; cover design differs.
Often Paired With
- Valve Cover Gasket: 3930906 (common B-Series gasket)
- Oil Fill Cap: 3901895 (B-Series cap)
- Center Bolt & Seal: 3902605 (bolt), 3935449 (isolator/seal)
What’s In The Box
- (1) Genuine Cummins Valve Cover w/ Oil-Fill (3928405)
- Gasket, cap, bolt, and seals sold separately (see “Often Paired With”).
Install Tips
- Clean mating surfaces thoroughly; install a new gasket to prevent leaks.
- Torque hardware to spec and verify breather/oil-fill interfaces are sealed.
- After first heat cycle, recheck for seepage and retorque if required.
FAQ
WILL THIS FIT MY 1989–1998 5.9L 12-VALVE RAM?Yes—this cover is widely used on B-Series 12-valve applications. Because there were variations by market/application, verify by VIN/ESN and the existing cover style.
IS THE OIL FILL CAP INCLUDED?No—order the cap separately (Cummins 3901895) along with the cap seal as needed.
WHAT GASKET DOES THIS COVER USE?Common pairing is valve cover gasket 3930906 for B-Series 3.9L/5.9L. Always match to your ESN.
DOES THIS FIT 24-VALVE OR COMMON-RAIL ENGINES?No—24-valve (1998.5–2002) and 2003+ common-rail engines use different cover designs.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3928405 valve (rocker) cover with integrated oil-fill provision.
