If you loosen the idler pulley bolt,and loosen the tension adjusting bolt,and remove the belt, the tension will be adversely affected.
Refer to illustration , and text on page 7-42 ,as displayed.
Always !! Keep A Firm Grip On Your Tool !!
Watch Out For The Air Hose Gone Wild!! Or Wear A Cup,: True Story
Whats the worse that can happen? Your jeeps already broke.