Product Description
The Cummins 3925009 OEM Oil Pressure Regulator Compression Spring is a genuine Cummins component used in the oil pressure relief and regulation assembly across a wide range of 5.9L and 6.7L Cummins engines (1994–2012). This spring controls the opening pressure of the oil pressure regulator valve, ensuring consistent lubrication system performance and preventing over-pressurization under cold-start or heavy-load conditions.
Over time, regulator springs can lose tension due to heat cycling and age. Replacing the worn spring with a genuine Cummins 3925009 restores correct oil pressure behavior, improves lubrication stability, and ensures long-term durability compared to aftermarket substitutes.
Fitment
- 1994–1998 Dodge Ram 2500/3500 – 5.9L 12-Valve Cummins
- 1998.5–2002 Dodge Ram 2500/3500 – 5.9L 24-Valve ISB Cummins
- 2003–2007 Dodge Ram 2500/3500 – 5.9L ISB Cummins (common-rail)
- 2007.5–2012 Dodge Ram 2500/3500 – 6.7L ISB Cummins
- Industrial, agricultural, and medium-duty applications using ISB/B-Series lubrication systems (ESN verification recommended)
Cross-Reference (Cummins-Only)
See related Cummins oil system hardware:
• Cummins 3915787 Threaded Plug – Oil Pressure Relief
• Cummins 3900625 Hex Flange Head Cap Screw
• Cummins 3900267 Tappet Cover Bolt Grommet Seal
FAQ
What does the Cummins 3925009 regulator spring do?
This spring controls the oil pressure relief valve, regulating maximum system pressure to protect the engine.
Can a weak regulator spring cause low oil pressure?
Yes. A fatigued spring may open the valve prematurely, resulting in lower-than-normal oil pressure.
Does this fit both 5.9L and 6.7L Cummins engines?
Yes — it is used across many B-Series and ISB lubrication systems from 1994–2012. Always confirm by engine serial number.
Should I replace the regulator valve when replacing the spring?
It is recommended if the valve shows wear, scuffing, or sticking. The spring and valve work together to maintain stable oil pressure.
Is this an internal engine component?
Yes. The spring is located inside the oil pressure regulator assembly on the lubrication system circuit.
Specifications for cummins 3925009
| Specification | Value |
|---|---|
| Brand | Cummins Genuine Parts |
| Part Number | 3925009 |
| Component Type | Oil Pressure Regulator Compression Spring |
| UPC | Not Published |
| GTIN | Not Published |
| Cross Reference | Used in Cummins ISB/B-Series oil pressure regulator assemblies |
| E-Codes | N/A |
| Shipping Weight | 0.05 lbs |
| Package Dimensions | 1 x 1 x 1 in |
| Prop 65 Warning | Not Applicable |
