Idler Pulley
An idler pulley guides the accessory or timing belt along its path.
What is Idler Pulley?
It has an internal bearing. It does not drive any component. It is often replaced with the belt. Spinning a pulley by hand with the belt removed reveals roughness or play. Timing belt kits usually include idler pulleys because they wear at a similar rate.
How it works
The pulley changes the belt's path and improves wrap.
Why it matters for your car
A worn bearing can squeal or rumble. A seized pulley can destroy the belt.
Other terms
- Airbag
- Automatic High Beam
- Bore And Stroke
- Brake Fluid
- CHAdeMO Connector
- Dashboard Protectant
- DOHC (Double Overhead Camshaft)
- Headlight Restoration
- Heated Windscreen
- Manufacturer Oil Approval
- Matching Numbers
- Peak Charging Power (Max kW)
- Privacy Glass
- Propeller Shaft Centre Bearing
- PWM Signal (Pulse-width Modulation)
- Self-levelling Suspension
- Spark Plug
- Tube-Type Tyre (Inner Tube)
- Tyre Size Code
- Universal Joint (U-joint)