This very common wear part is easy to inspect and easy to replace if you know how to loosen the drive belt. You do not need to take the belt all the way off - just drop the top down. The free video instructions by Kent will show you how to do this with a deep 17mm socket and breaker bar. OR, if you want to make it real easy check out Kent's customer tensioner release tool below.
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M112 M272 V6 M113 M273 V8 Belt Tension Release and Drive Belt Install Tool Set
Includes a long custom bent 3/8 extension, correct socket, plastic mirror, and locking pin. You add another 3/8 extension to make the job a snap. Watch the video below for a full explanation of this tool and how it works.
M112 V6 M113 V8 Drive Belt Tensioner Pulley
You will have to remove the drive belt to change this pulley. Once that is done replacement is easy. The free video instructions by Kent will show you how to do this as well as the proper way to remove and replace the drive serpentine belt.