Product Description
The CUMMINS 3963379 OEM ROCKER LEVER COVER GASKET (ROCKER BOX GASKET) is designed for 2003–2024 5.9L and 6.7L Cummins diesel engines. This genuine Cummins gasket provides a reliable seal between the rocker lever cover and cylinder head assembly, helping prevent oil leaks while maintaining proper engine operation.
Use this gasket when servicing the valve train, replacing injector components, removing the rocker cover, or repairing oil leaks around the top of the engine. Always verify fitment by engine serial number before ordering.
FEATURES
- Genuine Cummins OEM rocker lever cover gasket
- Direct-fit replacement for factory sealing applications
- Helps prevent oil leaks from the rocker box assembly
- Designed to meet Cummins OEM sealing specifications
- Ideal for maintenance, repair, and engine rebuild projects
- Built for long-term durability and reliability
FITMENT
- 2003–2007 Dodge Ram 2500/3500 5.9L Cummins Common Rail
- 2007.5–2024 Ram 2500/3500 6.7L Cummins
- Select Cummins ISB industrial and commercial applications
WHAT'S INCLUDED
- 1 Cummins 3963379 OEM Rocker Lever Cover Gasket
CROSS-REFERENCE AND RELATED PRODUCTS
- Cummins 3963379
- Rocker Lever Cover Hardware
- Cummins Valve Train Components
- Cylinder Head and Top End Gasket Components
SPECIFICATIONS
- Manufacturer: Cummins
- Part Number: 3963379
- Part Type: Rocker Lever Cover Gasket
- Alternate Description: Rocker Box Gasket
- Engine Compatibility: 5.9L Cummins, 6.7L Cummins
- Fitment Years: 2003–2024
- Vehicle Application: Dodge Ram / Ram 2500 and 3500
- Condition: New OEM Cummins
- Installation Type: Direct Replacement
FAQ
Will this gasket fit my truck?
This gasket fits many 2003–2024 5.9L and 6.7L Cummins applications. Always verify fitment by engine serial number before ordering.
Is this a genuine Cummins gasket?
Yes. Cummins 3963379 is a genuine OEM Cummins rocker lever cover gasket manufactured to factory specifications.
What does the rocker lever cover gasket do?
This gasket seals the rocker lever cover assembly to help prevent oil leaks and contamination while protecting internal valve train components.
When should this gasket be replaced?
The gasket should be replaced whenever the rocker cover is removed or whenever oil leakage is present around the rocker box area.
Is this the same as a valve cover gasket?
It is commonly referred to as a rocker box gasket or valve cover gasket depending on the application and service literature.
Do I need any related parts?
Inspect rocker cover hardware, injector seals, breather components, and related top-end gaskets during service and replace worn components as necessary.
