The timing belt idler pulley is in charge of routing the timing belt so it is in the right position. There can be more than one idler pulley on the timing chain and they can come in different sizes.
Timing belt idler pulley importanceTo route the timing belt to necessary components you need the timing belt idler pulley. The idler pulley is a metal wheel that has a smooth surface and keeps the timing belt in place as it controls the timing gears. The idler pulley is installed through the center of the engine, so the smooth part of the timing belt rotates the pulley to dampen the friction and heat.
Common issues with a faulty timing belt idler pulleyA faulty timing belt idler pulley can lead to stalling, an overheating engine, and the surface can become corroded.