Product Description
Cummins 3973853 OEM Valve Cover Bolt Vibration Isolator / Seal – Ram 5.9L & 6.7L Cummins (2006–2024)
The Cummins 3973853 OEM Valve Cover Bolt Vibration Isolator / Seal is the genuine factory replacement isolator designed for 2006–2024 Ram trucks equipped with the 5.9L or 6.7L Cummins diesel engine. This rubberized isolator fits over the valve cover mounting bolts to reduce vibration, maintain proper bolt tension, and help prevent oil seepage around the valve cover fasteners.
Over time, valve cover isolators can harden, crack, or lose elasticity due to constant heat cycles and engine vibration. Replacing worn isolators with genuine Cummins components helps restore proper sealing, reduces unwanted vibration, and ensures even valve cover clamping force for long-term reliability.
Features
- Genuine Cummins OEM replacement part
- Direct replacement for worn valve cover bolt isolators
- Helps reduce valve cover bolt vibration
- Maintains proper valve cover sealing pressure
- Helps prevent oil seepage around bolt locations
- Constructed from durable heat-resistant rubber material
- OEM fit, function, and reliability
- Simple installation during valve cover service
- Recommended when replacing valve cover gaskets
- Sold individually
Fitment
- 2006–2007 Dodge Ram 2500 & 3500 5.9L Cummins
- 2007.5–2024 Ram 2500 6.7L Cummins
- 2007.5–2024 Ram 3500 6.7L Cummins
- 2007.5–2024 Ram 4500 6.7L Cummins
- 2007.5–2024 Ram 5500 6.7L Cummins
- OEM-style Cummins valve cover assemblies utilizing vibration isolator seals
Note: Most valve cover applications require multiple isolators. Verify the quantity needed for your specific engine before ordering. Many applications utilize six isolators per engine.
What's Included
- One (1) Genuine Cummins 3973853 Valve Cover Bolt Vibration Isolator / Seal
Specifications
- Manufacturer: Cummins Genuine Parts
- Part Number: 3973853
- Component Type: Valve Cover Bolt Vibration Isolator / Seal
- Material: Rubberized Isolator
- Location: Valve Cover Bolt Mounting Points
- Function: Vibration Dampening and Oil Sealing
- Engine Compatibility: 5.9L ISB and 6.7L ISB Cummins
- Cooling System Compatibility: Oil-Cooled and Standard Valve Cover Applications
- Installation: Direct OEM Replacement
- Application: Ram Cummins Diesel Engines
- OEM Replacement: Yes
- Sold As: Individual Isolator
Cross Reference Numbers
3973853, Cummins 3973853, Valve Cover Bolt Isolator, Valve Cover Bolt Seal, Valve Cover Bolt Grommet, Rubber Valve Cover Isolator, Cummins Valve Cover Hardware
FAQ
What does the Cummins 3973853 vibration isolator do?
This isolator reduces vibration at the valve cover mounting bolts while helping seal the bolt pass-through locations to prevent oil seepage and maintain proper valve cover clamping force.
Should I replace these when installing a new valve cover gasket?
Yes. Over time the rubber material hardens and loses flexibility. Replacing the isolators during valve cover service helps ensure proper sealing and long-term reliability.
Does this fit both 5.9L and 6.7L Cummins engines?
Yes. The Cummins 3973853 fits 2006–2007 5.9L Cummins engines and 2007.5–2024 6.7L Cummins applications.
How many isolators are required per engine?
Most applications use six isolators, but the exact quantity may vary depending on model year and valve cover design. Always verify before ordering.
Is this a genuine Cummins part?
Yes. Part number 3973853 is a genuine Cummins OEM replacement vibration isolator designed to meet factory specifications.
Can a failed isolator cause oil leaks?
Yes. Worn, cracked, or flattened isolators can allow uneven valve cover pressure and oil seepage around the mounting bolt locations. Replacing them helps restore proper sealing.
