Volvo Valve Stem Seal 20924435

This is a Valve Stem Seal (also known as a valve stem oil seal) designed for the cylinder head assembly of Volvo heavy-duty diesel engines.

Product Specifications

Average Weight: ~ 0.004 kg

Compatibility: L350F ; EC700C ; A40E ; A40E FS ; EC700CHR ; A40F ; A40F FS ; A40F/G ; A40F/G FS ; EC750D ; EC950E ; EC750E ; A45G ; A45G FS ; A60H ; L350H ; EC750E HR ; EC950F ; L350H ; A45J ; A50J ; A60J ; Volvo Trucks (FH/FM/FMX/NH series) ; Volvo Penta

SL: 7H

Key Information

The valve stem seal is a high-precision component installed at the top of the valve guide. Its primary function is to regulate the amount of lubrication oil that reaches the valve stem, preventing excessive oil from entering the combustion chamber (which would cause oil consumption and carbon buildup) while also blocking exhaust gases from escaping into the cylinder head. Given that these seals operate in an environment of extreme heat and mechanical stress, they are designed to maintain their elasticity and sealing pressure over thousands of operational hours.

During engine maintenance or cylinder head overhauls, these seals should always be replaced. It is crucial to ensure that the valve stem surfaces are clean and free of nicks or grooves before installing new seals, and that the seal is seated correctly to avoid damage. A leaking valve stem seal is a common culprit for blue smoke at startup or increased oil consumption, making it a vital part of maintaining engine efficiency and emissions compliance.