Cummins 3955393 Genuine OEM Intake/Exhaust Valve Stem Seal (2003-2018 Dodge Ram Cummins)

The Cummins 3955393 OEM Valve Stem Seal is a factory-engineered replacement for both intake and exhaust valves on 2003-2018 Dodge Ram trucks with the 5.9L and 6.7L Cummins diesel engines. These seals prevent oil from leaking into the combustion chamber, ensuring proper valve operation, reduced oil consumption, and maximum engine reliability.

CPP Diesel carries only Genuine OEM Cummins parts, so you can trust that your 3955393 valve stem seal meets strict factory standards. Whether you're refreshing a high-mileage engine or performing a complete rebuild, OEM valve stem seals are a must for long-term performance.

Features

• Genuine Cummins part number 3955393
• Fits both intake and exhaust valves
• Designed for 2003-2018 Dodge Ram 5.9L & 6.7L Cummins
• Prevents oil leakage and reduces consumption
• Critical for rebuilds and top-end refresh

Cross Reference

OEM Cummins part #: 3955393

Frequently Asked Questions

What does a valve stem seal do?

Valve stem seals prevent engine oil from leaking past the valve guides into the combustion chamber, reducing oil consumption and smoke.

When should I replace my Cummins valve stem seals?

Signs of worn valve stem seals include excessive blue/white smoke at startup, high oil consumption, and fouled spark plugs in gas engines (or carbon buildup in diesels). They are typically replaced during a cylinder head rebuild.

Are these seals for both intake and exhaust valves?

Yes, Cummins 3955393 seals are designed for use on both intake and exhaust valves in 5.9L and 6.7L Cummins engines.

Can I use aftermarket seals instead?

While aftermarket options exist, OEM Cummins seals provide the best fit, longevity, and reliability for diesel performance and daily driving.

What other parts should I replace when servicing the cylinder head?

It's recommended to also replace the cylinder head gasket, intake and exhaust valves, and rocker lever components depending on wear and service intervals.

Related Categories

Find more Cummins sealing and valvetrain components in these subcategories:

• 2003-2007 Cummins Gaskets & Seals
• 2007.5-2012 Cummins Gaskets & Seals
• 2013-2018 Cummins Gaskets & Seals

• 2003-2007 Cummins Valves
• 2007.5-2012 Cummins Valves
• 2013-2018 Cummins Valves

Fitment

• 2003 Dodge Ram 2500/3500 5.9L Cummins
• 2004 Dodge Ram 2500/3500 5.9L Cummins
• 2005 Dodge Ram 2500/3500 5.9L Cummins
• 2006 Dodge Ram 2500/3500 5.9L Cummins
• 2007 Dodge Ram 2500/3500 5.9L Cummins
• 2008 Dodge Ram 2500/3500 6.7L Cummins
• 2009 Dodge Ram 2500/3500 6.7L Cummins
• 2010 Dodge Ram 2500/3500 6.7L Cummins
• 2011 Dodge Ram 2500/3500 6.7L Cummins

CPP Diesel - Your #1 Source for Cummins OEM & Performance Parts.