Product Description
The CUMMINS 3937438 OEM ROCKER LEVER ADJUSTING SCREW (VALVE LASH ADJUSTER) is designed for 1989–1998 Dodge Ram trucks equipped with the 5.9L 12-valve Cummins diesel engine. This genuine Cummins valvetrain component allows precise valve lash adjustment and helps maintain proper rocker arm operation, engine performance, and long-term reliability.
Use this part when repairing damaged rocker hardware, performing a valve adjustment, rebuilding a cylinder head, or restoring worn valvetrain components. Always verify fitment by part number and application before ordering.
FEATURES
- Genuine Cummins OEM rocker lever adjusting screw
- Direct-fit replacement valve lash adjuster
- Designed for 5.9L 12-valve Cummins applications
- Allows accurate valve lash adjustment
- Helps maintain proper rocker arm geometry and operation
- Ideal for maintenance, cylinder head service, and engine rebuilds
FITMENT
- 1989–1993 Dodge Ram D/W 250 and 350 5.9L Cummins 12-Valve
- 1994–1998 Dodge Ram 2500 5.9L Cummins 12-Valve
- 1994–1998 Dodge Ram 3500 5.9L Cummins 12-Valve
- Select Cummins 6BT industrial and commercial applications
WHAT'S INCLUDED
- 1 Cummins 3937438 OEM Rocker Lever Adjusting Screw
CROSS-REFERENCE AND RELATED PRODUCTS
- Cummins 3937438
- Cummins Rocker Lever Components
- Cummins Valve Bridge Components
- Cummins Pushrods and Valvetrain Hardware
SPECIFICATIONS
- Manufacturer: Cummins
- Part Number: 3937438
- Part Type: Rocker Lever Adjusting Screw / Valve Lash Adjuster
- Engine Compatibility: 5.9L Cummins 12-Valve
- Fitment Years: 1989–1998
- Vehicle Application: Dodge Ram 2500 / 3500
- Valvetrain Component: Yes
- Condition: New OEM Cummins
- Installation Type: Direct Replacement
FAQ
Will this part fit my truck?
This adjusting screw fits many 1989–1998 Dodge Ram trucks equipped with the 5.9L 12-valve Cummins engine. Always verify fitment by part number before ordering.
What does this adjusting screw do?
This screw is used to set valve lash on the rocker lever assembly, helping maintain proper valve train clearance and engine operation.
Is this a genuine Cummins part?
Yes. Cummins 3937438 is a genuine OEM Cummins rocker lever adjusting screw.
When should this part be replaced?
Replacement is recommended if the adjuster threads are damaged, excessively worn, corroded, or unable to maintain proper valve lash settings.
Can this be used during a cylinder head rebuild?
Yes. Many engine builders inspect and replace worn rocker arm hardware, including adjusting screws, during cylinder head service and engine rebuilds.
Do I need any related parts?
Inspect rocker levers, lock nuts, valve bridges, pushrods, and related valvetrain components during service and replace worn parts as necessary.
