In this Tech Byte, Cody Smith from the Cloyes Tech Lab clears up a common misconception about timing chain tensioner pistons.

While many think that small opening is an oiling port, it actually serves a much different—and critical—purpose for hydraulic function. Watch to learn how this design allows air to escape while keeping oil right where it needs to be.

Quick Takeaways:

-Air Venting: The hole in the piston tip acts as an air bleeder, not an oil supply.

-The “Spiral Plug”: This internal component is the secret to letting air out while restricting oil flow.

-Oil Supply Ports: These are located on the tensioner housing, never the hydraulically charged piston.

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