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Valve collet (also known as a valve cotter ,valve lock or valve keeper) is a small but crucial component in an internal combustion engine's valve train assembly. It secures the valve spring retainer to the valve stem, ensuring the valve remains properly seated while allowing it to open and close smoothly.
They lock the valve spring retainer in place on the valve stem.
They keep the valve spring compressed, maintaining proper valve operation.
They prevent the valve from dropping into the combustion chamber if the retainer fails.
Split Collet (Two-Piece) Collets – Most common, shaped like two half-cones that fit together.
Single-Piece Collets – Less common, used in specific applications.
Tulip or Groove-Style Collets – Used in performance or high-revving engines for better retention.
Wear & Fatigue: Over time, collets can wear out, leading to valve failure.
Improper Installation: If not seated correctly, they can dislodge, causing valve drop.
Corrosion: Exposure to heat and oil can degrade them over time.
Always inspect collets during valve service.
Use a valve spring compressor for safe removal and installation.
Match the collet type to the valve stem groove design.
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