CUMMINS 3920706 OEM EXPANSION PLUG (TURBO DRAIN) – RAM 5.9L/6.7L (1989–2018)

Product Description

The Cummins 3920706 OEM Expansion Plug (Turbo Drain Plug) is a genuine Cummins block plug used to seal unused turbocharger oil-drain ports on 5.9L and 6.7L Cummins B-Series/ISB engines. This plug is commonly installed when changing turbo configurations, blocking an unused secondary drain location, or restoring an OEM engine block to factory specifications. Designed to withstand heat, vibration, and crankcase pressure, this genuine Cummins expansion plug ensures a leak-free seal and long-term reliability across all model years from 1989–2018.

Ideal for stock, towing, fleet, and performance builds, the 3920706 turbo drain expansion plug prevents oil leaks and ensures that the lubrication system maintains correct pressure and flow characteristics. Do not risk aftermarket plugs that loosen or leak — use OEM Cummins hardware for dependable results.

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 Dodge Ram 2500/3500 – 6.7L Cummins
• Also used across industrial, agricultural, and B-Series/ISB engines when blocking unused turbo oil drain locations

Note: Because drain plug locations vary by turbocharger and OEM configuration, confirm with ESN if used outside standard Ram applications.

Cross-Reference (Cummins-Only)

Common Cummins hardware & components used with or near turbo oil drain systems:
• Cummins 3900625 OEM Hex Flange Head Cap Screw
• Cummins 3909395 OEM Spring Hose Clamp
• Cummins 3915787 OEM Threaded Plug

FAQ

What does the Cummins 3920706 expansion plug seal?

This plug seals an unused turbocharger oil drain port on the Cummins 5.9L and 6.7L engine block.

Do I need this plug for a single-turbo conversion?

Yes. Many compounds or OEM configurations use dual drain ports. When switching to a single turbo, this OEM plug is used to block the secondary drain.

Is sealant required during installation?

Cummins typically specifies installing expansion plugs with clean surfaces and proper seating force. Some ESNs require sealant. Follow OEM manual guidelines.

Does this plug fit both 5.9L and 6.7L Cummins?

Yes — the 3920706 plug is used across 1989–2018 5.9L and 6.7L Cummins engines.

Will this work on industrial/ISB engines?

Yes, but verify by Engine Serial Number (ESN) as some industrial blocks use alternate drain-port sizes.

Specifications for cummins 3920706