Product Description
The Cummins 3926700 OEM Valve Spring is the factory-engineered replacement spring used across 5.9L 12-Valve Cummins (1989–1998) along with many 4BT and 6BT B-Series diesel engines. This genuine Cummins spring maintains correct valve control, lift response, and durability under the demanding operating conditions of the B-Series platform. Engineered to strict OEM tolerances, the 3926700 spring ensures consistent seat pressure, proper valve sealing, and reduced valvetrain wear—essential for stock engines, tow rigs, work trucks, and long-life industrial equipment.
If you are rebuilding a 12-Valve head, repairing weak/worn springs, or restoring performance lost to age and heat cycles, installing genuine Cummins 3926700 valve springs guarantees the precision and reliability your B-Series engine was designed for.
Fitment
- 1989–1998 Dodge Ram 2500/3500 with 5.9L Cummins 12-Valve (6BT)
- 4BT 3.9L Cummins (various industrial, marine, and on-road applications)
- 6BT 5.9L industrial B-Series engines using standard-rate valve springs
Note: Industrial and off-highway engines vary by CPL/ESN. Verify by engine serial number (ESN) for exact spring specification.
Cross-Reference (Cummins-Only)
Related valvetrain components for 12-Valve and B-Series engines:
• Cummins 3904409 OEM Valve Stem Guide – 51.75mm
• Cummins 3904408 OEM Valve Stem Guide – 60.50mm
• Cummins 3910810 OEM Exhaust Rocker Arm – 12-Valve
• Cummins 3937438 Rocker Lever Adjusting Screw
FAQ
Is the Cummins 3926700 valve spring the correct spring for all 12-Valve engines?
Yes. This is the standard OEM valve spring used on 1989–1998 5.9L 12-Valve Cummins engines.
Does this spring fit 4BT and 6BT industrial engines?
Yes, in most cases. The 3926700 is widely used across B-Series industrial engines, but CPL/ESN verification is recommended.
Should valve springs be replaced during a head rebuild?
Yes. Valve springs weaken with heat cycles and mileage. Replacing them ensures correct seat pressure and prevents floating at higher RPM.
Are these springs suitable for performance cams?
OEM springs work for stock and mild upgrades but may not handle high lift or heavy boost. Performance builds require stronger springs.
Specifications for cummins 3926700
| Specification | Value |
|---|---|
| Brand | Cummins Genuine Parts |
| Part Number | 3926700 |
| Component Type | Valve Spring – B-Series Valvetrain |
| UPC | Not Published |
| GTIN | Not Published |
| Cross Reference | Used across 4BT / 6BT OEM valvetrain systems |
| E-Codes | N/A |
| Shipping Weight | 0.10 lbs (per spring) |
| Package Dimensions | 2 x 2 x 2 in |
| Prop 65 Warning | Not Applicable |
