Product Description
Cummins 3928405 OEM Valve Cover With Oil Fill – 4BT/6BT 5.9L (1989–1998 12V)
The Cummins 3928405 OEM Valve Cover with Oil Fill is the factory-correct valve cover assembly designed for 1989–1998 Cummins 4BT and 6BT 12-Valve diesel engines. Manufactured to Cummins OEM specifications, this durable aluminum valve cover features an integrated oil fill opening and is engineered to provide proper sealing, crankcase protection, and long-term reliability in demanding diesel applications.
Whether you're restoring a first-generation Dodge Ram, replacing a damaged valve cover, or refreshing a high-mileage 12-Valve Cummins engine, the genuine Cummins 3928405 delivers factory fitment, proper gasket alignment, and the OEM appearance enthusiasts and diesel owners expect. Unlike many aftermarket alternatives, this genuine Cummins component is designed specifically for 12-Valve B-Series engines and helps prevent leaks caused by warped or poorly fitting covers.
Features
- Genuine Cummins OEM valve cover assembly
- Integrated oil fill opening
- Factory-correct fit and appearance
- Heavy-duty aluminum construction
- Designed for 12-Valve Cummins engines
- Helps maintain proper crankcase sealing
- Direct replacement for damaged or leaking valve covers
- Ideal for restoration, maintenance, and engine rebuild projects
- Engineered for long service life in diesel applications
- OEM Cummins quality and durability
Fitment
- 1989–1993 Dodge Ram 2500 and 3500 with 5.9L Cummins 12-Valve (6BT)
- 1994–1998 Dodge Ram 2500 and 3500 with 5.9L Cummins 12-Valve (6BT)
- Cummins 4BT 3.9L industrial engines using 12-Valve style valve cover
- Cummins 6BT 5.9L B-Series diesel engines
- 12-Valve Cummins conversion projects
- Industrial, agricultural, and marine 4BT and 6BT applications
Note: This is the single-piece OEM valve cover used on 12-Valve Cummins engines. It is not compatible with later 24-Valve ISB engines that utilize a different valve cover design. Verify engine serial number and part number compatibility before ordering.
What's Included
- Cummins 3928405 OEM Valve Cover
- Integrated Oil Fill Opening
Specifications
- Manufacturer: Cummins Genuine Parts
- Part Number: 3928405
- Component Type: Valve Cover with Integrated Oil Fill
- Material: Aluminum
- Engine Family: Cummins B-Series
- Engine Compatibility: 4BT 3.9L and 6BT 5.9L 12-Valve
- Model Years: 1989–1998
- Configuration: Single-Piece Valve Cover
- Oil Fill Provision: Integrated Oil Fill Opening
- Application: OEM Replacement
- Primary Use: Valve Train Protection and Crankcase Sealing
- Associated Gasket: Cummins 3930906
- Associated Oil Fill Cap: Cummins 3901895
- Approximate Shipping Weight: 3 Pounds
Cross Reference Numbers
3928405, 3902605, 3902666, 3910824, 3914136, 3960372, J928405, SA3928405, 3930906, 3901895
FAQ
Is the Cummins 3928405 the correct valve cover for all 12-Valve 5.9L Cummins engines?
Yes. The 3928405 valve cover is commonly used on 1989–1998 12-Valve Cummins 6BT engines and many 4BT applications utilizing the same valve cover design.
Does this valve cover include the oil fill cap?
This valve cover includes the oil fill opening. Depending on inventory and supplier packaging, the oil fill cap may be sold separately. Always review the product contents before ordering.
Will replacing my valve cover help stop oil leaks?
Yes. Warped, cracked, or damaged valve covers are a common source of oil leaks on older Cummins engines. Replacing the valve cover and gasket can help restore proper sealing.
Does this fit 24-Valve Cummins engines?
No. The 3928405 valve cover is designed specifically for 12-Valve Cummins engines and is not compatible with the later 24-Valve ISB valve cover system.
Can this be used on performance or modified engines?
Yes. This OEM valve cover works well on stock, towing, restoration, and performance-oriented 12-Valve Cummins builds that require factory fitment and dependable sealing.
