Product Description
CUMMINS 3943626 OEM VALVE CROSSHEAD (ROCKER ARM VALVE BRIDGE) – RAM 5.9L/6.7L (1998.5–2018)
The genuine CUMMINS 3943626 OEM valve crosshead—also referred to as a rocker arm valve bridge—is a critical valvetrain component used on 1998.5–2018 5.9L and 6.7L ISB Cummins engines. Each crosshead transfers lift from a single rocker arm to a pair of valves, ensuring precise, balanced, and synchronized valve movement. If your engine is exhibiting rough idle, tapping noises, uneven valve lash, or valvetrain wear, replacing worn crossheads with 100% authentic Cummins components restores factory reliability and valve operation.
These valve bridges are manufactured to Cummins metallurgy and hardness specifications, providing long-term durability under constant high-load, high-temp valvetrain conditions. Always inspect crossheads during valve lash service or when camshaft, rocker arm, or pushrod wear is present.
Key Features
- Genuine Cummins OEM rocker arm valve bridge (crosshead).
- Direct replacement for worn or uneven crossheads on 5.9L & 6.7L ISB engines.
- Precision-machined for accurate valve lift transfer and smooth valvetrain motion.
- Hardened wear surfaces maintain correct lash and valve timing.
- Compatible with OEM rocker arms and valves on 1998.5–2018 applications.
Fitment Details
- Engine: 5.9L Cummins ISB (1998.5–2007), 6.7L Cummins ISB (2007.5–2018)
- Vehicle Applications: Dodge/Ram 2500 & 3500
- Notes: Engines use one crosshead per valve pair; inspect all during service.
Cross-Reference & Companion Cummins Parts
For complete valvetrain service, pair CUMMINS 3943626 with these genuine Cummins components available at CPP Diesel:
- CUMMINS 3944086 ROCKER ARM – works in conjunction with the valve crosshead.
- CUMMINS 3931570 PUSHROD – replaces bent or worn pushrods to restore valvetrain geometry.
- CUMMINS 3947530 CROSSHEAD PIVOT PIN – supports the crosshead and ensures proper alignment.
- VIEW ALL GENUINE CUMMINS PARTS
Common Cummins cross-reference numbers: 3943626, 3943626NX, 3943626RX (verify by VIN/ESN).
Installation Notes
- Always set valve lash to factory specification after replacing crossheads.
- Inspect pivot pins and rocker arms for abnormal wear.
- Oil components before installation to prevent dry-start wear.
- Replace any crossheads showing pitting, scoring, or uneven contact surfaces.
Specifications for cummins 3943626
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3943626 |
| Alternate / Reman Numbers | 3943626NX, 3943626RX (verify by VIN/ESN) |
| Function | Valve crosshead (rocker arm valve bridge) |
| Engine Compatibility | 5.9L ISB (1998.5–2007), 6.7L ISB (2007.5–2018) |
| Vehicle Fitment | 1998.5–2018 Dodge/Ram 2500 & 3500 |
| UPC | 658121729905 |
| GTIN | 658121729905 |
| Shipping Weight | Approx. 0.2 lb |
| Shipping Method | Standard ground (small parcel) |
| E-Codes / Emissions | Not emissions-related |
| Prop 65 Warning | WARNING: May expose you to chemicals known to the State of California to cause cancer and reproductive harm. See www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (varies by production) |
Frequently Asked Questions
HOW MANY CROSSHEADS DOES MY ENGINE USE?
Each valve pair uses one crosshead. Most 5.9L/6.7L ISB engines use 6 crossheads total. Inspect all during service.
WHAT SYMPTOMS INDICATE A WORN OR DAMAGED CROSSHEAD?
Uneven valve lash, tapping noises, performance loss, and abnormal rocker/pushrod wear are common indicators.
SHOULD I REPLACE THE PIVOT PIN WHEN INSTALLING A NEW CROSSHEAD?
Yes—if the pivot pin shows wear. OEM replacement is available here: CUMMINS 3947530.
IS THIS A GENUINE CUMMINS PART?
Yes—CPP Diesel sells only authentic Cummins OEM components for correct fit and durability.
