Piston Pin (Wrist Pin, Gudgeon Pin)
The piston pin is a hollow steel pin that connects the piston to the small end of the connecting rod.
What is Piston Pin (Wrist Pin, Gudgeon Pin)?
It lets the connecting rod swing while the piston moves straight up and down. Circlips or a press fit keep it in place. It is lubricated by oil splash or a jet. Many modern pins are fully floating, meaning they can turn in both the piston and the rod. Some have special coatings to reduce friction.
How it works
The rod pivots on the pin as the crankshaft turns.
Why it matters for your car
Wear causes a light, sharp knock that may be louder when cold. Pin wear is uncommon on well-maintained engines.
Other terms
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- Clear Coat
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- Exhaust Flex Pipe
- Exhaust System
- Fuel Trim
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