first you should release the belt tension pully and remove the belt. Then the idler pully has a bolt through the center remove the bolt and the pully should come off.
The 1999 Jeep Cherokee employs an interesting idler pulley assembly. What you need to do is:1. Remember the belt routing, it's not printed under the hood.2. Loosen the 15mm hex nut on the idler pulley3. There's a bracket that the idler pulley is connected to and a 15mm tensioning bolt to turn to release the tension off of the belt.Jeep Cherokees seem to like Premium belts best.
The idler pulley is on a spring loaded arm. To release the tension, use a long breaker bar, or a long pipe on a box wrench. Use the proper size wrench or socket, and put it on the idler pulley bolt head. Rotate the idler arm assembly in a counter clock-wise direction and the tension will be released. Then you can remove the belt. Hint use rubber bands to keep the belt on the other pulleys while replacing the alternator. Joedi
Best to get a shop manual for this operation, if you have not replaced it before. Usually there is an "Idler Pulley" on many late model cars that is "spring loaded". You "Bias" this pulley using the big nut in the middle of the pulley (usually with a socket wrench) so that the serpentine belt has enough slack in it so you can remove it. Install new belt by reverse procedure. TommyTrouble
The 1999 Mercury Grand Marquis has (2) TWO engine styles, both different. The style for Vin numbers with a "W" engine, and the Vin numbers with an "X". The "W" series has the A/C Compressor to the RIGHT of the engine when viewed from the front. The belt circles all components from the outside but two (2). The idler wheel located on top to the right of the alternator, and the tensioner pulley, located to the right and between the Crank and Water pump pulleys. The belt goes UNDER the idler pulley, and passes to the Tensioner pulley BETWEEN the crank pulley and the water pump pulley. As for the "X" series... The Belt goes, in clockwise rotation, from the outside looking AT the engine: Starting with the top most component, OUTSIDE the Alternator, OUTSIDE the steering pump, INSIDE the water pump (V grooves on belt showing),OUTSIDE the crankshaft pulley, INSIDE the tensioner (V grooves on belt showing, again),OUTSIDE the A/C Compressor, and then towards the Alternator again. The Idler wheel presses against the belt on this return leg from the smooth side.
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