Product Description
MAHLE C31801 is a molded-rubber thermostat housing (engine coolant outlet) O-ring for the 2003–2007 Ford 6.0L Powerstroke. It restores a leak-free seal at the thermostat housing and is built to OE standards trusted by technicians.
- Application: Ford 6.0L Powerstroke thermostat housing (engine coolant outlet)
- Material: Molded rubber
- Inside diameter (approx.): 68 mm / 2.710" (reference spec)
Fitment
- 2003–2007 Ford F-250 / F-350 / F-450 / F-550 Super Duty (6.0L Powerstroke)
- 2003–2005 Ford Excursion (6.0L Powerstroke)
- Also used on E-Series vans 2004–2010 with 6.0L (additional coverage reference)
Cross Reference & Related
- Motorcraft RG-571 (engine coolant outlet O-ring, OE equivalent)
- Pairs with Motorcraft RT-1169 thermostat assembly (thermostat + housing)
- Category: Thermostats & Housings – 2003–2007 Ford 6.0L at XDP
What’s Included
(1) Thermostat housing O-ring seal.
FAQ
Will this fit my 2003–2007 6.0L Powerstroke?
Yes—this seal fits the thermostat housing on 2003–2007 Super Duty trucks with the 6.0L Powerstroke (and also appears on 2003–2005 Excursion; vans 2004–2010 use the same style).
Is this an OEM-quality part?
Yes—MAHLE supplies OE-quality sealing components. The C31801 meets or exceeds OE performance.
Do I need anything else?
If the thermostat or housing is worn, consider replacing with an OE thermostat assembly (Motorcraft RT-1169) and use this O-ring during reassembly.
What are the dimensions?
This molded rubber O-ring’s inside diameter is approximately 68 mm (2.710"), suitable for the 6.0L outlet.
