CUMMINS 3937111 GENUINE OEM FRONT CRANKSHAFT SEAL FOR 1989-2018 DODGE RAM DIESEL

The Cummins 3937111 Front Crankshaft Seal is a genuine OEM replacement for 1989-2018 Dodge Ram Cummins 5.9L and 6.7L engines. This front main seal provides a leak-free barrier between the crankshaft and timing cover, preventing oil leaks and protecting your engine from contamination.

Unlike aftermarket options, this OEM Cummins seal is engineered for factory fit, durability, and reliability. It is an essential component when servicing your timing gear case or during routine maintenance.

Features & Benefits

• OEM Quality: Genuine Cummins part #3937111.
• Wide Fitment: Fits Dodge Ram Cummins 5.9L (1989-2007) and 6.7L (2007.5-2018).
• Leak Prevention: Seals the crankshaft to keep oil in and debris out.
• Durability: Designed for long service life under heat, pressure, and vibration.

Cross Reference Part Numbers

• Cummins 3937111
• Replaces older Cummins seal part numbers where applicable

Frequently Asked Questions

When should I replace the front crankshaft seal?

Replace if you notice oil leakage around the harmonic balancer, oil on the timing cover, or during a timing case reseal job.

Do I need special tools to install it?

Yes. Proper seal installation tools are recommended to ensure correct fitment without damaging the seal or crankshaft surface.

Should I replace this seal when doing a timing gear case reseal?

Absolutely. Whenever the timing cover is removed or serviced, replacing the front main seal prevents future leaks.

Related Categories

Find more OEM Cummins sealing and timing components in our dedicated categories:

• 1989-1993 Cummins Gaskets & Seals
• 1994-1998 Cummins Gaskets & Seals
• 1998.5-2002 Cummins Gaskets & Seals
• 2003-2007 Cummins Gaskets & Seals
• 2007.5-2012 Cummins Gaskets & Seals
• 2013-2018 Cummins Gaskets & Seals

• 1989-1993 Cummins Timing Gear Case & Covers
• 1994-1998 Cummins Timing Gear Case & Covers
• 1998.5-2002 Cummins Timing Gear Case & Covers
• 2003-2007 Cummins Timing Gear Case & Covers
• 2007.5-2012 Cummins Timing Gear Case & Covers
• 2013-2018 Cummins Timing Gear Case & Covers

Fitment

• 1989 Dodge Ram 2500/3500 5.9L Cummins
• 1990 Dodge Ram 2500/3500 5.9L Cummins
• 1991 Dodge Ram 2500/3500 5.9L Cummins
• 1992 Dodge Ram 2500/3500 5.9L Cummins
• 1993 Dodge Ram 2500/3500 5.9L Cummins
• 1994 Dodge Ram 2500/3500 5.9L Cummins
• 1995 Dodge Ram 2500/3500 5.9L Cummins
• 1996 Dodge Ram 2500/3500 5.9L Cummins
• 1997 Dodge Ram 2500/3500 5.9L Cummins
• 1998 Dodge Ram 2500/3500 5.9L Cummins
• 1999 Dodge Ram 2500/3500 5.9L Cummins
• 2000 Dodge Ram 2500/3500 5.9L Cummins
• 2001 Dodge Ram 2500/3500 5.9L Cummins
• 2002 Dodge Ram 2500/3500 5.9L Cummins
• 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
• 2012 Dodge Ram 2500/3500 6.7L Cummins
• 2013 Dodge Ram 2500/3500 6.7L Cummins
• 2014 Dodge Ram 2500/3500 6.7L Cummins
• 2015 Dodge Ram 2500/3500 6.7L Cummins
• 2016 Dodge Ram 2500/3500 6.7L Cummins
• 2017 Dodge Ram 2500/3500 6.7L Cummins
• 2018 Dodge Ram 2500/3500 6.7L Cummins

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