Rear Main Seal Set - Ford 6.0L Diesel

The Rear Main Seal Set for Ford 6.0L Diesel engines is a critical engine block component designed to prevent oil leakage at the crankshaft's aft position, where the transmission interfaces with the engine block. This seal set is essential for any 6.0L Power Stroke diesel owner experiencing crankcase oil seepage, whether during routine maintenance or addressing an active leak. The 6.0L platform—notorious in the diesel community for durability challenges—demands OEM-quality sealing solutions to maintain compression integrity and prevent costly secondary damage to transmission fluid.

Manufactured by MAHLE ORIGINAL under the Clevite specification (MPN JV1684), this rear main seal set incorporates precision-engineered elastomer and metal components that maintain a dynamic seal against the rotating crankshaft under extreme diesel engine pressures and temperature fluctuations. The seal's geometry is engineered to handle the specific runout and surface finish tolerances of Ford's 6.0L crankshaft, ensuring zero-slip engagement that resists both radial pressure and axial load transfer from the transmission. MAHLE's OEM-equivalent construction means superior material composition compared to generic aftermarket alternatives, reducing blow-by and preventing the slow weep that eventually saturates bell housings and transmission casings.

Ford 6.0L diesel engine builders and restoration shops specify this seal set for full-power rebuild operations, as well as for field repairs on trucks showing oil seepage between engine and transmission. Installation requires engine-to-transmission separation and crankshaft exposure, making this a component best paired with professional service or advanced DIY builds. The compact 6.3 x 2.3 x 6.6 inch package fits standard Ford engine compartments and integrates seamlessly with stock crankshaft geometry, delivering reliable long-term sealing for daily-driver trucks, fleet vehicles, and high-mileage restorations.