Product Description
MAHLE K31803 is the OE-style molded-rubber water pump gasket for mid-cycle 6.0L Power Stroke trucks. It restores a positive seal between the pump and front cover to stop coolant seepage after pump service or replacement.
- Material: Molded rubber (OE-style)
- Item Grade: OEM standard
- O-ring size: ID 100 mm, TK 3.55 mm
- Warranty: 1-Year Limited
- GTIN/UPC: 027067652843
Fitment
- 2004.5, 2005, 2006, 2007 Ford Super Duty F-250/F-350/F-450/F-550 with 6.0L Power Stroke diesel
Cross Reference Numbers
- Ford: 4C3Z-8507-AA (also listed as 4C3Z8507AA)
- International/Navistar: 1844634C1
What’s Included
- (1) Water pump gasket / O-ring, MAHLE K31803
FAQ
Will this fit my 2004 6.0L?
This gasket fits the 2004.5 “late-build” through 2007 trucks. If your truck is an early-2004 build, verify by VIN/production date before ordering.
Is this an O-ring or flat paper gasket?
It’s a molded-rubber O-ring that seals the water pump to the front cover.
Do I need sealant?
No additional sealant is typically required on molded O-rings. Lightly lubricate with coolant for installation and follow Ford torque specs.
What OEM numbers does it replace?
Ford 4C3Z-8507-AA and International 1844634C1.
Any tips for a leak-free install?
Clean the groove and cover, inspect for nicks/corrosion, and torque the pump in a criss-cross pattern to spec. Replace any pitted fasteners.
