How do I replace the Idler Pulley on my 1994 Jeep Grand Cherokee?

which engine? we can not guess engines.
unless, stated, or show with a photo. (add photo)
open hood see EPA sticker and engine is clearly stated there. USA.

read the FSM
read alldata. com
ZJ
4.0L:?
do tell and we CAN answer.

idler on 4.0, just it, is IT bad, or just a belt swap, do tell.
serpentine belt.
the book says, engine with no power steering (you) do have
spring loaded, idler, but the other engines and with power streering
NOT.
so is this a P/S free car" I must assume so this is the FSM quote for taht
special case: (ive never seen a P./s free GC) but here goes.
If the engine is equipped with an idler pulley, loosen the idler pulley adjusting bolt, insert a prybar between the pulley and the engine (or in the idler pulley adjusting slot), and adjust the tension accordingly. If the engine is not equipped with an idler pulley, the alternator must be moved to accomplish this adjustment, as outlined under Alternator Belt.

why not post a photo of the part that cant be removed.????

but if V8?? (it should not be, as that was introduced in 1994)(
it has a turn bolt CW to release tension, on V8 idler.
my book dont show how to remove said pulley
but I think yours is broken.

That is the idler pulley and they do go bad and need replacing if wobbling or squeaking.

1998 Jeep Grand Cherokee 5.2 Liter And 5.9 Liter Serpentine Belt Routing try this link http://autorepair.about.com/library/pictures/illustrations/bl750a-lib.htm

Your threads should be standard right hand. Don't worry about the pulley turning when you break the bolt loose. The bolt is isolated from the pulley by a bearing (the one that failed) so the two turn independent of one another.

Good luck.

Should only be one bolt going thru the center of the pulley. probably a 14 or 15mm size.

It is as simple as removing the nut and pulling it off and sliding the new one on. Once you get it back replace the belt and set it to the correct tension. It is as simple as that. Without a belt tension gauge a good rule of thumb is about 1 inch of deflection at the longest belt run.
On your engine it's 1 inch between the power steering pump and the air conditioner compressor.

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Starting at a/c compressor working clockwise: Over a/c, over p/s pump, backside of belt over water pump,, down around crank pulley, up over idler/tensioner, over alt, under idler and back to a/c.

Around the outside of power steering pulley,under idler,over a/c comp,around alternator,over fan pulley, around crank pulley, over water pump. The backside of the belt contacts the idler, fan and water pump.

most likely a worn idler pulley or a part that has a bad bearing or going bad.

If you have the same pulley arrangement that most 4.0 engines have that pulley is an idler not a tensioner. Your power steering pump has a pivot bolt, and a slide under the pump. You adjust belt tension using the pump.