The power steering pump is movable to tension the belt.There are 3 or 4 cap screws to loosen and an adjustment bolt under the pump to tighten or loosen the belt.Hard to describe but easy to see and...
With the proper tools & patience, this should not be too difficult if you have moderate mechanical skills. First start about a week BEFORE you plan to take them off and soak them with PB Blaster...
First, there should be a diagram of the serpentine belt and pulley system on the top of the radiator fan cowling. If there is not, make one b/4 you remove yours--just draw the pulley arrangement...
YES, The 1992 Jeep Wrangler 2.5 liter engine (4 Cylinder) Does have a timing chain. I just finished a rebuild of My 2.5 and it does in fact have a Chain.