Mahle SS45390 Engine Valve Stem Oil Seal Set - Intake and Exhaust

Mahle Valve Stem Oil Seal Set SS45390

Mahle SS45390 is an engine valve stem oil seal set built for intake and exhaust valve sealing in classic Ford and Mercury applications. With nitrile construction and OE-style dimensions, it supports consistent valve stem control in engines used across Ford F-100, F-250, F-350, Mustang, Thunderbird, and Mercury Cougar applications.

Key Features

• Engine valve stem oil seal set for intake and exhaust positions
• Nitrile seal material for dependable sealing performance
• Inside diameter: 0.372 in. / 9.4 mm
• Outside diameter: 0.9 in.
• Thickness and height: 0.028 in. / 0.7 mm
• OE-style sealing dimensions for classic Ford and Mercury engines
• Mahle SS45390 cross-references Fel-Pro SS 13399, SS 13401 and Rol SS15714 for the same application

Detailed Description

Mahle SS45390 is a valve stem oil seal set engineered for engines that require precise sealing at the valve stem. The listed dimensions, including a 0.372-inch inside diameter, 0.9-inch outside diameter, and 0.028-inch thickness, help support proper fit at the valve guide area. This part is listed for intake and exhaust use on a wide range of Ford and Mercury vehicles, including 1957-1963 Ford F-100, F-250, and F-350; 1967-1976 Ford F-100, F-250, and F-350; 1967-1970 Ford Mustang; and 1967-1970 Mercury Cougar. It also appears in applications such as Ford Thunderbird, LTD, and Mercury Marquis, making SS45390 a relevant choice for classic engine sealing service.

What It Helps Address

• Oil leakage past the valve stem seal area
• Excessive oil consumption from worn stem seals
• Blue exhaust smoke caused by oil entering the combustion chamber
• Valve guide sealing wear during engine rebuild or service
• Loss of consistent sealing at intake and exhaust valves

Installation Notes and Tips

Verify valve stem diameter and seal dimensions before installation, especially on rebuilt or mixed-component engines. Clean the valve guide area thoroughly and inspect the stem and guide surfaces for wear, scoring, or carbon buildup before fitting the seals. Confirm application details for your specific Ford or Mercury engine configuration, since this part is listed across multiple model years and engine families. For search reference, this part is commonly sought as a valve stem oil seal set for 1957-1976 Ford F-100, F-250, F-350 and 1967-1970 Ford Mustang applications.

Quality Assurance

Mahle gaskets and sealing products are used by OEMs and technicians worldwide, and SS45390 follows that OE-focused approach to engine sealing. The part is built to support reliable valve stem sealing in classic Ford and Mercury service applications.