Valve Spring
The valve spring closes each valve and keeps it in contact with the cam or rocker as the engine turns.
What is Valve Spring?
Springs are made from high-strength steel wire; some engines use two springs per valve. Small retainers and collets lock the spring to the valve stem. At very high revs weak springs can let the valve "float", losing control of its motion.
How it works
The spring is compressed when the valve opens and pushes it back onto its seat when the cam allows.
Why it matters for your car
A broken spring causes a persistent misfire and can lead to the valve hitting the piston. Over-revving puts extra strain on the springs.
Other terms
- Automatic Emergency Braking (AEB)
- Automatic High Beam
- Battery Terminal And Clamp
- Bulb Failure Warning
- Charging System Test
- Concours d’Elegance
- Door Card (Door Panel)
- Downpipe
- Emissions Test
- Immobilizer
- Induction Motor (Asynchronous Motor)
- Litres Per 100 Km (l/100 Km)
- NOx (Nitrogen Oxides)
- Oil Drain Plug
- Parking Pawl
- Scheduled Charging (Charging Timer)
- Snow Chains (Tyre Chains)
- Tyre Changer (Tyre Fitting Machine)
- Wh/km And kWh/100 Km (EV Consumption)
- Wire Wheels (Spoked Wheels)