Mahle SS45904 Engine Valve Stem Oil Seal Set - Intake and Exhaust

Mahle Valve Stem Oil Seal Set SS45904

Mahle SS45904 is an engine valve stem oil seal set for intake and exhaust service on select Ford, Mercury, and Lincoln applications. Built with fluoroelastomer sealing material, it is specified for precise stem sealing where oil control and valve-train cleanliness matter.

Key Features

• Fluoroelastomer valve stem seal material for heat-resistant sealing performance
• Inside diameter: 0.306 in; upper inside diameter at valve side: 7.8 mm
• Outside diameter: 0.548 in for proper stem seal fitment
• Stem overall height: 0.588 mm; thickness/height listed at 0.023 in
• Engine valve stem oil seal set for intake and exhaust positions
• Mahle sealing product line trusted by OEMs and technicians

Detailed Description

Mahle SS45904 is an OE-style engine valve stem oil seal set engineered for select Ford Explorer, Ford Bronco, Ford F-150, Ford F-250, Ford Mustang, Mercury Mountaineer, and related applications. The fluoroelastomer construction helps maintain a stable seal at the valve stem, supporting consistent oil control in the intake and exhaust valve areas. This part cross-references Fel-Pro SS 72683 and Ford F3ZZ-6571-C for the same application.

Use Mahle SS45904 when you need a direct replacement valve stem seal for engines that require accurate stem dimensions and durable sealing material. The listed dimensions, including 0.306-inch inside diameter and 0.548-inch outside diameter, help confirm proper fit during engine service and rebuild work. Mahle SS45904 is a practical choice for Ford Explorer and Ford Mustang valve stem seal replacement, as well as other covered Ford, Mercury, and Lincoln models.

What It Helps Address

• Oil leakage past worn valve stem seals
• Blue exhaust smoke caused by oil entering the combustion chamber
• Oil consumption from deteriorated stem sealing
• Valve-train contamination from poor oil control
• Compression and idle issues related to worn top-end sealing components

Installation Notes and Tips

Confirm valve stem diameter, seal height, and outside diameter against the engine specification before installation. Inspect valve guides and stems for wear, since excessive clearance can shorten seal life. Clean the valve stem and guide area thoroughly during cylinder head service, and verify intake and exhaust placement matches the application requirements.

Quality Assurance

Mahle sealing products are used in OEM and professional repair environments, with a focus on consistent material quality and dimensional accuracy. SS45904 is built as a fluoroelastomer valve stem seal set for dependable engine sealing service.