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A Valve Stem Cap (or Valve Stem Seal Cap) is a component in an internal combustion engine that plays a critical role in sealing and protecting the valve stem. It is typically a small, hard-wearing part that ensures proper function of the valve train.
The valve stem cap’s main role is to cover the top of the valve stem to keep contaminants, dirt, or debris from entering the valve guide and causing premature wear. It also helps maintain a seal between the valve stem and the valve guide, reducing the leakage of oil into the combustion chamber. Additionally, it helps in reducing the friction between the valve stem and the valve guide.
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