NOK MD307342 Engine Valve Stem Oil Seal

The NOK MD307342 is a high-quality engine valve stem oil seal designed to provide precise lubrication control for valve stems in internal combustion engines. This OEM-equivalent seal is commonly used in Mitsubishi, Dodge, and Chrysler applications, delivering reliable performance in demanding high-temperature and high-pressure environments.

Key Features:

• Constructed from premium fluorine rubber (Viton) for superior heat and oil resistance
• Equipped with self-tightening spring for consistent sealing pressure throughout the seal's service life
• Prevents excessive oil consumption by controlling oil metering to valve guides
• Reduces engine emissions by preventing oil from entering the combustion chamber
• Protects against valve guide wear while preventing carbon buildup on valve seats
• Designed to withstand extreme temperatures and aggressive modern engine oils

Valve stem seals are critical engine components that control the precise amount of oil delivered to lubricate the valve stem as it moves through the valve guide. Too little oil causes premature stem and guide wear, while excessive oil leads to increased consumption, blue exhaust smoke, and carbon deposits that can damage valve seats. The NOK MD307342 features a positive seal design that meters oil accurately, ensuring optimal engine performance and longevity. This seal is compatible with both gasoline and diesel engines with or without forced induction.