Product Description
The Cummins 3922488 OEM Rocker Lever Shaft is the factory-correct rocker arm support shaft for all 1989–1998 5.9L 12-Valve Cummins (6BT) engines. This hardened OEM shaft provides precise rocker alignment, proper oil distribution, and reliable support for all intake and exhaust rocker levers. When rebuilding, repairing, or refreshing a 12-valve top end, replacing worn or scored rocker shafts with genuine Cummins components ensures long-term durability and proper valvetrain geometry.
High mileage, poor lubrication, or contamination can cause wear on the rocker shaft journals, leading to noisy valvetrain operation, lash instability, or accelerated rocker arm wear. The 3922488 shaft restores OE performance and prevents premature top-end failures.
Fitment
- 1989–1993 Dodge D/W 250/350 with 5.9L 12V Cummins (6BT)
- 1994–1998 Dodge Ram 2500/3500 with 5.9L 12V Cummins (6BT)
- 5.9L 12-Valve B-Series industrial/off-highway engines (verify by ESN)
Cross-Reference (Cummins-Only)
Related Cummins 12-Valve valvetrain components:
• Cummins 3910810 OEM Exhaust Rocker Arm
• Cummins 3904408 OEM Valve Stem Guide – 60.50mm
• Cummins 3904409 OEM Valve Stem Guide – 51.75mm
FAQ
How many rocker shafts does a 12-Valve 5.9L Cummins use?
The 5.9L 12V Cummins uses two rocker lever shafts per cylinder head — one for cylinders 1–3 and one for cylinders 4–6.
What symptoms indicate the rocker shaft should be replaced?
Common signs include valvetrain ticking, excessive lash variation, visible scoring, poor oiling, or rocker arm wear.
Can worn shafts damage rocker arms?
Yes. A worn shaft accelerates rocker bore wear, increases friction, and can cause valve timing inconsistencies. Replacing with a genuine Cummins 3922488 shaft prevents these issues.
Does the rocker shaft have an orientation?
Yes. Oil feed holes must face in the correct direction for proper lubrication. Follow Cummins service manual instructions during installation.
Should I replace rocker bolts and adjusting screws at the same time?
It is recommended to inspect or replace adjusting screws, nuts, bolts, and all rockers when installing a new shaft, especially on high-mileage engines.
Specifications for cummins 3922488
| Specification | Value |
|---|---|
| Brand | Cummins Genuine Parts |
| Part Number | 3922488 |
| Component Type | Rocker Lever Shaft (Rocker Arm Shaft) |
| UPC | Not Published |
| GTIN | Not Published |
| Cross Reference | Used with OEM rocker levers (3910810 & 3910811) |
| E-Codes | N/A |
| Shipping Weight | 1.20 lbs |
| Package Dimensions | 13 x 2 x 2 in |
| Prop 65 Warning | Not Applicable |
