Product Description
The CUMMINS 3921640 OEM VALVE STEM SEAL is designed for 1989–1998 Dodge Ram trucks equipped with the 5.9L 12-valve Cummins diesel engine. This genuine Cummins valve stem seal helps control oil flow at the valve guide while maintaining proper lubrication and reducing oil consumption.
Use this part when rebuilding a cylinder head, replacing worn valve seals, or servicing valve train components. Always verify fitment by engine serial number and part number before ordering.
FEATURES
- Genuine Cummins OEM valve stem seal
- Direct-fit replacement for factory valve seals
- Helps control oil flow at the valve guide
- Supports proper valve train operation and engine efficiency
- Designed for long service life and durability
- Ideal for cylinder head repair and engine rebuilds
FITMENT
- 1989–1993 Dodge Ram 2500/3500 5.9L Cummins 12-Valve
- 1994–1998 Dodge Ram 2500/3500 5.9L Cummins 12-Valve
- Select Cummins 6BT industrial applications
WHAT'S INCLUDED
- 1 Cummins 3921640 OEM Valve Stem Seal
CROSS-REFERENCE AND RELATED PRODUCTS
- Cummins 3921640
- Valve Guides
- Valve Springs
- Cylinder Head Rebuild Components
SPECIFICATIONS
- Manufacturer: Cummins
- Part Number: 3921640
- Part Type: Valve Stem Seal
- Engine Compatibility: 5.9L Cummins 12-Valve (6BT)
- Fitment Years: 1989–1998
- Vehicle Application: Dodge Ram 2500 / 3500
- Condition: New OEM Cummins
- Installation Location: Cylinder Head Valve Guide
- Installation Type: Direct Replacement
FAQ
Will this part fit my truck?
This valve stem seal fits many 1989–1998 Dodge Ram 2500 and 3500 trucks equipped with the 5.9L 12-valve Cummins engine. Always verify fitment before ordering.
Is this a genuine Cummins part?
Yes. Cummins 3921640 is a genuine OEM valve stem seal manufactured to Cummins specifications.
What does a valve stem seal do?
Valve stem seals help control the amount of oil that passes between the valve guide and valve stem while maintaining proper lubrication.
What are the symptoms of worn valve stem seals?
Common symptoms include increased oil consumption, blue smoke during startup, oil fouling on valves, and reduced engine efficiency.
Should valve stem seals be replaced during a head rebuild?
Yes. Replacing valve stem seals during cylinder head service or engine rebuilds is strongly recommended.
Do I need any related parts?
Inspect valve guides, valves, springs, retainers, keepers, and other cylinder head components during installation and replace worn parts as necessary.
