Product Description
Cummins 3904409 OEM Valve Stem Guide 51.75mm – 5.9L 12-Valve (1989–1998)
The Cummins 3904409 OEM Valve Stem Guide (51.75mm) is a genuine Cummins replacement component engineered to restore proper valve alignment, oil control, and long-term valvetrain reliability in 1989–1998 5.9L 12-Valve Cummins 6BT engines. Manufactured to exact OEM specifications, this valve guide ensures consistent valve stem support and helps maintain proper cylinder head performance in stock, towing, work truck, and performance applications.
Whether you're completing a cylinder head rebuild, performing preventative maintenance, or assembling a complete engine build, the Cummins 3904409 valve stem guide delivers the precise fit and durability expected from genuine Cummins parts. Worn valve guides can contribute to increased oil consumption, valve train wear, and poor sealing performance, making replacement an important part of any quality cylinder head refresh.
Features
- Genuine Cummins OEM valve stem guide
- 51.75mm thick-wall guide design
- Manufactured to OEM specifications and tolerances
- Restores proper valve stem alignment
- Helps maintain correct oil control
- Reduces premature valve and seat wear
- Ideal for cylinder head rebuilding and repair
- Designed for long-term durability and reliability
- Suitable for stock, towing, and performance applications
- Direct replacement for worn or damaged factory valve guides
Fitment
- 1989–1998 Dodge Ram 2500 equipped with 5.9L 12-Valve Cummins
- 1989–1998 Dodge Ram 3500 equipped with 5.9L 12-Valve Cummins
- 5.9L Cummins 6BT diesel engines
- OEM cylinder heads utilizing 51.75mm valve stem guides
- Cylinder head rebuild and restoration applications
Note: Professional installation is recommended. Valve stem guides typically require pressing, sizing, and final machining to achieve proper valve stem-to-guide clearance during cylinder head rebuilding.
What's Included
- One Genuine Cummins 3904409 Valve Stem Guide
Specifications
- Manufacturer: Cummins Genuine Parts
- Part Number: 3904409
- Component: Valve Stem Guide
- Guide Length: 51.75mm
- Design: Thick-Wall Valve Guide
- Engine Platform: Cummins 6BT
- Engine Displacement: 5.9L
- Engine Configuration: 12-Valve
- Model Years: 1989–1998
- Application: Cylinder Head Repair and Rebuilding
- Construction: OEM Cummins Specification
- Weight: Approximately 0.09 lbs
Cross Reference Numbers
3904409, Cummins 3904409, 3904408, 3967475 Cylinder Head Application, HE3904409, J904409, K3904409, C3904409
FAQ
What is the length of the Cummins 3904409 valve stem guide?
The Cummins 3904409 valve stem guide measures 51.75mm in length and is commonly used in OEM 5.9L 12-Valve cylinder heads requiring the shorter guide design.
What engine does the Cummins 3904409 fit?
This valve stem guide is designed for 1989–1998 5.9L 12-Valve Cummins 6BT diesel engines and compatible cylinder heads utilizing the 51.75mm guide specification.
Should valve stem guides be replaced during a cylinder head rebuild?
Yes. Replacing worn valve guides helps restore proper valve alignment, improves oil control, and reduces long-term valve train wear, making it a recommended procedure during cylinder head rebuilding.
Is machining required during installation?
In most cases, valve stem guides are installed and sized by a machine shop to ensure proper valve stem-to-guide clearance and OEM performance specifications.
Can this guide be used in performance builds?
Yes. Genuine Cummins valve guides are commonly used in stock, towing, and performance applications because they maintain OEM tolerances and durability.
What is the difference between Cummins 3904409 and 3904408?
The 3904409 is the 51.75mm guide, while Cummins 3904408 is commonly referenced as the longer valve guide version used in specific cylinder head applications. Always verify fitment before ordering.
