same way you took it off, by rotating the belt tensioner
Uh, the fan belt
I didn't see how it came off. Should the fan be off the engine?
Check this link, scroll down to the bottom to look at the belt diagram, the belt tensioner will need to be moved to release the tension and install the belt. Use a socket and long wrench or breaker bar to rotate it with the center nut...http://serpentinebelt- replacement.com/1998FordRangerSerpentineBeltReplacement
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