Description
Product Overview
The Cummins 3974093 pressure relief valve is a genuine OEM engine component. It is built to regulate and control excessive pressure within a diesel engine’s fuel or lubrication system. When pressure rises above a specified limit, the valve opens automatically. This helps to prevent mechanical damage, oil leaks, and other system malfunctions.
The valve is essential for the performance and safety of diesel engines. Precise pressure control ensures optimal combustion, reduced wear, and compliance with emission standards. This component is widely used in various Cummins diesel engine models.
Key Features
- ✅ OEM Certified: Genuine Cummins part for guaranteed compatibility and performance.
- ✅ Reliable Pressure Control: Automatically vents pressure to protect engine components.
- ✅ Durable Build: Manufactured with corrosion-resistant materials for long-term use.
- ✅ Sealed Design: Requires no maintenance during its service life.
- ✅ Easy Replacement: Direct fit for fast and secure installation.
Function and Purpose
The 3974093 pressure relief valve functions as a critical safety component. It controls internal pressure levels within engine systems such as:
- Fuel delivery circuits
- Lubrication systems
- Hydraulic bypass configurations (depending on engine design)
When pressure exceeds safe limits, the valve opens to relieve stress. Once the pressure drops back to normal, the valve reseals. This protects key engine parts and helps maintain smooth, efficient operation.
Technical Specifications
- Part Number: 3974093
- Type: Pressure Relief Valve
- Application: Fuel/oil/hydraulic system (depending on engine type)
- Compatible Engines: ISF2.8, ISF3.8, ISBE, QSB, and others
- Material: Corrosion-resistant alloy or stainless steel
- Operating Pressure: Factory pre-set specification
- Installation: Threaded OEM design with leak-proof seal
- Size & Weight: Compact, engine-bay friendly
Installation Tips
- Make sure the engine is cool and depressurized before starting.
- Remove the old valve and clean the mounting area.
- Check for debris, oil residue, or thread damage.
- Apply thread sealant if needed.
- Torque the new valve according to Cummins service specifications.
- Run the engine and inspect for any leaks or pressure anomalies.
⚠️ Note: Do not reuse old or damaged valves. Fatigued components may fail under pressure.
When to Replace the Valve
Consider replacing the pressure relief valve if:
- You notice visible leaks or oil stains near the valve seat.
- Engine diagnostics detect irregular fuel or oil pressure.
- The valve fails a pressure bench test.
- A fault code is triggered related to system pressure.
- The engine is undergoing a major overhaul.
Replacing the valve as part of preventive maintenance can help reduce the risk of system failure.
Quality Assurance
As an original Cummins part, the 3974093 valve meets high quality standards. Each unit undergoes strict tests, such as:
- Leak and seal testing
- Pressure release accuracy validation
- Thermal and corrosion resistance checks
- Durability testing under real engine conditions
Compatible Engine Models
The 3974093 pressure relief valve fits multiple Cummins engines, including:
- ISF2.8 / ISF3.8
- ISBE Series
- QSB Series
- B3.3 / B4.5 / B5.9
- QSL9 and others
Please confirm compatibility with your engine model before ordering.
Why Choose the Cummins 3974093 Valve?
- Maintains stable internal engine pressure
- Prevents damage to key components
- Designed for long-lasting performance
- Trusted OEM solution used worldwide
- Quick, direct-fit installation
Conclusion
The Cummins 3974093 pressure relief valve is an essential component for maintaining pressure balance within diesel engine systems. With OEM-grade quality, rugged design, and precise engineering, this valve helps ensure safe, reliable, and efficient engine operation.
For heavy-duty applications, trust only genuine Cummins parts for peace of mind and long-term performance.
