Rear Main Seal 11-17 Ford 3.5L

The Rear Main Seal 11-17 Ford 3.5L is a critical engine block component designed to prevent oil leakage at the crankshaft's rear exit point. This seal is essential for any Ford owner running the 3.5-liter EcoBoost engine during the 2011–2017 model years who has noticed weeping oil, seepage around the bellhousing, or accumulating residue on the transmission housing. Whether you're performing routine maintenance or addressing an active leak, this MAHLE ORIGINAL/CLEVITE seal delivers OEM-equivalent performance without the dealership markup.

MAHLE ORIGINAL seals are engineered from high-grade elastomer compounds that withstand sustained engine oil temperatures, thermal cycling, and crankshaft rotational forces without hardening or losing integrity over time. The rear main seal interfaces directly with the crankshaft flange and relies on a precision contact lip to maintain a controlled oil film—excessive wear or material degradation allows pressurized crankcase oil to migrate past the seal into the bellhousing area. This OEM-specification part (MPN 67827) is manufactured to strict dimensional tolerances, ensuring proper seating in the engine block's rear bore and reliable long-term performance.

Mechanics and DIY enthusiasts tackling transmission removal, engine rebuild, or high-mileage service will benefit from having this seal on hand. Installation requires engine block preparation and careful crankshaft inspection to ensure a proper fit. This part is ideal for those looking to maintain the performance and reliability of their Ford 3.5L EcoBoost engine.