Volvo Valve Stem Seal 21501189

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

Product Specifications

Average Weight: ~ 0.004 kg

Compatibility: Widely used across Volvo D11, D12 (A/B/C/D platforms), and Volvo Penta marine engine series, Volvo Trucks, A25D ; A30D ; L150E ; L220E ; L180E ; L150E ; L180E ; T450D ; L150F ; L180F ; L180F HL ; L220F ; A25E ; A30E ; A35E ; A35E FS ; PL4608 ; EC360B ; EC330B ; 4400 ; L120B VOLVO BM ; A25C VOLVO BM ; L120C VOLVO BM ; A20C VOLVO BM ; L120C ; A20C ; A25C ; L120D ; A35D ; A40D ; L220E ; L180E ; L180E

Supersession: 859171 > 21501189

SL: 7H

Key Information

The valve stem seal is a high-precision component located between the intake/exhaust valve stems and the cylinder head. Its primary function is to regulate the amount of lubrication oil that reaches the valve stem to prevent excessive oil consumption and carbon buildup in the combustion chamber, while simultaneously preventing exhaust gases from escaping into the cylinder head. Because this seal operates in the high-heat, high-vibration environment of the combustion cylinder, it is typically manufactured from advanced synthetic elastomers (such as FKM/Viton) to ensure long-term elasticity and thermal resistance. During a cylinder head overhaul or valve service, it is critical to replace these seals to maintain engine efficiency, prevent blue smoke from the exhaust, and avoid oil contamination. Always ensure the valve stem is free of grooves or scoring before installing a new seal to guarantee a proper seat.