Valve Stem Seal Cummins 3948578 | 5253590, J948578, 12031800

High-Performance Valve Stem Seal for Cummins Engines

Keep your heavy-duty diesel engine running cleanly and efficiently with this premium valve stem seal. Designed specifically for Cummins ISC and ISL series engines, this seal prevents engine oil from entering the combustion chamber through the valve guides. By maintaining a tight, reliable seal, it helps reduce oil consumption, minimizes exhaust smoke, and prevents carbon buildup on the valves.

Technical Specifications

• Dimensions: 33.80 mm x 13.80 mm x 7.40 mm x 18.80 mm
• Material: High-grade elastomer engineered for extreme thermal and chemical resistance
• Application: Exhaust valve stem sealing

Compatible Engine Models

This valve stem seal is engineered to fit a wide range of Cummins medium and heavy-duty diesel engines, including:

• Cummins ISC 8.3
• Cummins ISL 8.9 / ISL 9
• Cummins QSC 8.3
• Cummins QSL 8.9 / QSL 9

Please verify your engine serial number (ESN) or existing part number prior to ordering to ensure perfect compatibility.