Mahle 6.0L Powerstroke Up-Pipe to Y-Pipe Gasket (F31804)

An exhaust leak at the up-pipe to Y-pipe joint can cost you boost and fill the engine bay with exhaust noise. The Mahle F31804 gasket seals the bolted flange where the passenger-side up-pipe meets the Y-pipe on the 6.0L Powerstroke. It interchanges with Ford 3C3Z-6N640-AA, and one gasket covers this joint.

Key Benefits & Features

• Seals the Bolted Flange: Fits the bolted connection between the passenger-side up-pipe and the Y-pipe.
• OE Interchange: Replaces Ford 3C3Z-6N640-AA and Navistar 1839620C4.
• One Per Engine: The 6.0L uses one of these gaskets at this joint.
• What's in the Box: (1) Mahle F31804 up-pipe to Y-pipe gasket.

Fitment

• 2003–2007 Ford F-250, F-350 and F-450 / F-550 Super Duty 6.0L Powerstroke Diesel
• 2003–2005 Ford Excursion 6.0L Powerstroke Diesel
• 2004–2010 Ford E-350 Super Duty and 2005–2010 E-450 Super Duty 6.0L Powerstroke Diesel vans
• Part Number: Mahle F31804 (interchanges with Ford 3C3Z-6N640-AA)

Tech & Installation Notes

• Replace It Whenever the Joint Comes Apart: Use a new gasket any time the passenger up-pipe is unbolted from the Y-pipe, including turbo service and up-pipe upgrades.
• Clean Both Flanges: Remove carbon and old gasket material from both flange faces so the new gasket seats flat.