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If you're car uses a timing belt you probably know that it periodically needs to be replaced. You will want to strongly consider replacing any tensioners or rollers that the timing belt rides on. Also, if the water pump is spun by the timing belt, you should replace the water pump at the same time. If any of these components fail, it can destroy the water pump at the same time and cause severe engine damage. Look at the photo of the cylinder head with timing belt.
Timing belt with Roller and Tensioner SS#250018036
Cylinder Head with Timing Belt SS# 195974960
Timing Belt SS# 136530983
Water Pump w/ Toothed Pulley for Timing Belt SS# 258006917