Product Description
Cummins 3920706 OEM Expansion Plug (Turbo Drain) – Ram 5.9L/6.7L (1989–2018)
The Cummins 3920706 OEM Expansion Plug (Turbo Drain Plug) is a genuine Cummins replacement plug designed to seal unused turbocharger oil drain ports on 5.9L and 6.7L Cummins B-Series and ISB engines. Commonly used during turbocharger upgrades, single-turbo conversions, compound turbo modifications, and engine restoration projects, this OEM expansion plug provides a secure, leak-free seal for long-term reliability.
Manufactured to Cummins specifications, the 3920706 expansion plug is designed to withstand engine heat, vibration, oil exposure, and crankcase pressure while maintaining proper lubrication system integrity. Whether you're repairing a leaking turbo drain location, blocking an unused oil return port, or restoring an engine to factory configuration, this genuine Cummins component delivers dependable performance and OE-quality fitment.
Features
- Genuine Cummins OEM replacement part
- Designed to seal unused turbocharger oil drain ports
- Helps prevent oil leaks and contamination
- OE-quality fitment and sealing performance
- Resists heat, vibration, and crankcase pressure
- Ideal for single-turbo and compound-turbo conversions
- Commonly used during engine repairs and rebuilds
- Suitable for stock, towing, fleet, and performance applications
- Direct replacement for worn or damaged expansion plugs
- Built to Cummins factory specifications
Fitment
- 1989–1998 Dodge Ram 2500/3500 – 5.9L 12-Valve Cummins
- 1998.5–2002 Dodge Ram 2500/3500 – 5.9L 24-Valve Cummins ISB
- 2003–2007 Dodge Ram 2500/3500 – 5.9L Common Rail Cummins
- 2007.5–2018 Ram 2500/3500 – 6.7L Cummins
- B-Series Cummins engines
- ISB Cummins engines
- Industrial and agricultural Cummins applications requiring part number 3920706
Note: Turbo drain locations and block configurations may vary by engine serial number and application. Always verify compatibility using your Cummins ESN before ordering.
What's Included
- Cummins 3920706 OEM Expansion Plug
Specifications
- Manufacturer: Cummins Genuine Parts
- Part Number: 3920706
- Component Type: Expansion Plug / Turbo Drain Block Plug
- Function: Seals Unused Turbocharger Oil Drain Port
- Material: OEM Metal Construction
- Installation Type: Press-Fit Expansion Plug
- Application: Turbo Oil Drain Port Sealing
- Engine Family: Cummins B-Series / ISB
- Fitment Range: 1989–2018 Ram Cummins Applications
- Weight: Approximately 0.05 lbs
- Package Dimensions: Approximately 1 x 1 x 1 Inches
Cross Reference Numbers
3920706, 205401, 5263672, M-3920706, CUM3920706, 3484SS, GCP-3484SS
FAQ
What does the Cummins 3920706 expansion plug do?
The 3920706 expansion plug is used to seal an unused turbocharger oil drain port in the engine block, helping prevent oil leaks and maintain proper lubrication system operation.
Do I need this plug for a single-turbo conversion?
In many cases, yes. When converting from certain compound or dual-drain turbo configurations to a single-turbo setup, an unused drain location may need to be sealed using this OEM expansion plug.
Does this fit both 5.9L and 6.7L Cummins engines?
Yes. The Cummins 3920706 expansion plug is commonly used across 1989–2018 5.9L and 6.7L Cummins B-Series and ISB engine applications.
Is sealant required during installation?
Installation procedures can vary by engine serial number and service manual requirements. Always follow Cummins service recommendations for proper installation and sealing procedures.
Can this plug be used on industrial Cummins engines?
Yes. The 3920706 expansion plug is used on numerous B-Series and ISB industrial applications, but compatibility should always be confirmed using the engine serial number.
Why use a genuine Cummins expansion plug?
OEM Cummins components are manufactured to factory specifications, ensuring proper fitment, durability, and long-term sealing performance in demanding engine environments.
