It's a pulley that guides the belt
An "idler" is typically used for tensioning of a belt, as in the timing belt, or a chain.
Most technicians refer to the idler pully for the timing belt as just idler.
If it is a 4cyl then no. It has an upper and lower timing chain. If it is a 6cyl then yes. It has a timing belt, an idler, and a belt tentioner that all should be replaced at the same time.
there is no such thing as timing belt bearings...... are you posibly thinking of an idler pulley? or cam bearings?
Timing belt - usually replaced with service every 54,000 miles. The belt is available on its own, or as part of a kit, including the idler pulleys.
Parts and labor for timing belt, water pump, #1 and # 2 timing belt idler pulleys should be around $900.00 www.lextechautomotivellc.com
Idler and tensioner pulleys, cam and crank oil seals and pays to do water pump also if it is driven from the timing belt.
It is a timing belt and it is best to replace the idler, tensioner and belt at once. Also, the water pump if it is high mileage.
The water pump is located behind the timing belt cover. It is driven by the timing belt. If you decide to replace it, replace the belt and idler pullys at the same time.
Worn or incorrect belt. Defective, glazed idler or pulleys.
If the idler pulley is frozen, it is high time to replace the timing belt and the idler. And while that job is being done, consider replacing the water pump and thermostat.
Take it to the dealer! It's not a job for the timid or any shop that doesn't know what they are doing. Make sure you get the idler pulleys and automatic tensioner replace along with the timing belt. If the bearings seize in those idler pulleys it will ruin the belt and in turn take out your engine.