Product Description
The CUMMINS 3900955 OEM EXPANSION PLUG (FREEZE PLUG) is designed for 1989–2002 5.9L Cummins diesel engines. This genuine Cummins expansion plug is commonly used at the dipstick location and helps seal unused or serviceable openings in the engine block while maintaining proper engine integrity.
Use this part when repairing coolant leaks, replacing corroded freeze plugs, performing engine rebuilds, or servicing engine block components. Always verify fitment by year, make, model, engine, and engine serial number before ordering.
FEATURES
- Genuine Cummins OEM expansion plug
- Commonly used at the dipstick location on 5.9L Cummins engines
- Direct-fit replacement freeze plug
- Helps maintain proper sealing of engine block openings
- Recommended during engine rebuild and cooling system service
- Constructed to Cummins OEM specifications
FITMENT
- 1989–1993 Dodge Ram 5.9L Cummins
- 1994–1998 Dodge Ram 2500/3500 5.9L Cummins
- 1998.5–2002 Dodge Ram 2500/3500 5.9L Cummins 24V
- Select Cummins 5.9L industrial and commercial applications
WHAT'S INCLUDED
- 1 Cummins 3900955 OEM Expansion Plug (Freeze Plug)
CROSS-REFERENCE AND RELATED PRODUCTS
- Cummins 3900955
- Engine block expansion plugs
- Cooling system service components
SPECIFICATIONS
- Manufacturer: Cummins
- Part Number: 3900955
- Part Type: Expansion Plug / Freeze Plug
- Engine Compatibility: 5.9L Cummins
- Fitment Years: 1989–2002
- Vehicle Application: Dodge Ram 2500 and 3500
- Location: Dipstick Opening
- Condition: New
- Quantity: Sold Individually
FAQ
Will this part fit my truck?
This part fits the applications listed above. Always verify your year, make, model, engine, and engine serial number before ordering.
Is this a direct replacement?
Yes. Cummins 3900955 is a direct-fit OEM replacement expansion plug for the listed applications.
What is included?
This listing includes one Cummins 3900955 OEM expansion plug.
What is the purpose of this freeze plug?
This plug seals a designated opening in the engine block and helps prevent coolant leaks while maintaining proper engine operation.
When should this plug be replaced?
Replace the plug if corrosion, leakage, damage, or engine service requires removal of the existing plug.
Do I need any related parts?
Inspect nearby freeze plugs, coolant passages, gaskets, seals, and cooling system components during service and replace worn parts as necessary.
