Product Description
Cummins 3906854 OEM Intake Valve Seat Insert – 5.9L 12-Valve (1989–1998)
The Cummins 3906854 OEM Intake Valve Seat Insert is a genuine Cummins replacement component designed to restore proper valve sealing, heat transfer, and cylinder head reliability in 1989–1998 5.9L 12-Valve Cummins engines. Manufactured to OEM specifications, this hardened intake valve seat insert helps maintain compression, prevent valve recession, and ensure long-term durability in stock, towing, rebuilt, and performance applications.
Whether you're performing a complete cylinder head rebuild or replacing worn valve seats during machine work, the Cummins 3906854 intake seat provides the precise fit and durability required for dependable engine performance. Using genuine Cummins valve train components helps ensure proper valve sealing and long service life under demanding operating conditions.
Features
- Genuine Cummins OEM intake valve seat insert
- Direct replacement for worn or damaged intake valve seats
- Designed for 5.9L 12-Valve Cummins cylinder heads
- Restores proper valve sealing and compression
- Improves heat transfer from the valve to the cylinder head
- Helps prevent premature valve burning and seat recession
- Manufactured to Cummins OEM specifications
- Ideal for stock, towing, rebuild, and performance applications
- Recommended during cylinder head rebuilding and machine work
- Provides long-term durability and reliability
Fitment
- 1989–1998 Dodge Ram 2500 with 5.9L 12-Valve Cummins
- 1989–1998 Dodge Ram 3500 with 5.9L 12-Valve Cummins
- Cummins 6BT 5.9L diesel engines
- Cummins B-Series diesel engines
- 4BT and 6BT industrial applications using intake valve seat part number 3906854
- OEM 12-Valve cylinder heads (intake side)
Note: Professional machine shop installation is recommended. Proper installation requires removal of the existing seat insert, machining of the counterbore when necessary, installation of the new seat, and final valve seat cutting to OEM specifications.
What's Included
- One (1) Genuine Cummins 3906854 Intake Valve Seat Insert
Specifications
- Manufacturer: Cummins Genuine Parts
- Part Number: 3906854
- Component Type: Intake Valve Seat Insert
- Engine Platform: Cummins B-Series
- Engine Compatibility: 5.9L 12-Valve 6BT
- Cylinder Head Location: Intake Side
- Material: Hardened Valve Seat Insert
- Installation: Machine Shop Installation Recommended
- Quantity Required Per Cylinder Head: Six (6) Intake Seats
- Application: Cylinder Head Rebuilding and Repair
- OEM Replacement: Yes
Cross Reference Numbers
3906854, Cummins 3906854, Intake Valve Seat Insert, 6BT Intake Seat, B-Series Intake Seat, 4BT Intake Seat
FAQ
Is the Cummins 3906854 for the intake or exhaust side?
This part is the intake valve seat insert for Cummins B-Series cylinder heads. For exhaust valve seat service, the corresponding exhaust seat insert should be purchased separately.
Should valve seat inserts be replaced during a cylinder head rebuild?
Yes. Replacing worn valve seat inserts helps restore proper valve sealing, improve compression, and reduce the risk of valve burning or seat recession.
How many valve seat inserts are required per cylinder head?
A complete 5.9L 12-Valve Cummins cylinder head requires six intake valve seat inserts.
Can this valve seat insert be used in performance or towing applications?
Yes. Genuine Cummins hardened valve seat inserts are commonly used in stock, towing, heavy-duty, and performance engine builds because of their durability and precise fitment.
Does installation require machine work?
Yes. Proper installation requires specialized cylinder head machining equipment and should be performed by a qualified machine shop.
