Tensioner bearing may have failed. Does it tilt when you pull on it? Check all pulleys on the belt for play/tilting. Replace any component that you can tilt significantly.
Maybe the belt was not center on the pulley's, try it again, make should the belt is center on all pulley, there no other reason why the belt would pop off, if the engine was not running.
ADJUSTMENT
Excessive belt tension will cause damage to the alternator and water pump pulley bearings, while, on the other hand, loose belt tension will produce slip and premature wear on the belt. Therefore, be sure to adjust the belt tension to the proper level.
To adjust the tension on a drive belt, loosen the adjusting bolt or fixing bolt locknut on the alternator, alternator bracket or tension pulley. Then move the alternator or turn the adjusting bolt to adjust belt tension. Once the desired value is reached, secure the bolt or locknut and recheck tension.
REMOVAL & INSTALLATION
1.5L, 1.6L, 1.8L, 2.0L and 2.4L Engines
Fig. Accessory V-belt routing-Mitsubishi 1.5L, 1.6L, 1.8L, 2.0L and 2.4L engines
Alternator Belt
Fig. Loosen the adjuster lock bolt . . .
Fig. . . . then remove the alternator belt from the engine
Fig. After the adjusting and fixed bolts are loosened, rotate the pump . . .
Fig. . . . then remove the power steering belt from the engine
Fig. Serpentine belt routing-Mitsubishi 3.0L engines (except 1998-00 Galant models)
Fig. Accessory V-belt routing-Mitsubishi 3.5L and 1998-00 3.0L SOHC Galant engines
ALTERNATOR AND A/C COMPRESSOR
Fig. Accessory drive belt routing-2.7L engine
Chrysler Cirrus & Sebring Convertible; Dodge Stratus; Plymouth Breeze
Fig. Accessory drive belt routing-Chrysler 2.7L engine
2.7L Engine
A/C & Alternator Belt
Fig. Installing A/C & alternator belt-2.7L engine
Remove the alternator/power steering and water pump drive belt to gain access to the air conditioning belt.
Loosen the tensioner pulley locknut, then turn the adjusting screw to raise or lower the tensioner pulley assembly. Remove the belt.
To install:
Install the belt.
To adjust the belt, loosen the tensioner pulley nut and adjust the belt tension by tightening the adjusting screw. Tighten the pulley nut to 40 ft. lbs. (54 Nm) after adjustment.
Install the alternator/power steering and water pump drive belt and adjust.
Start the engine and check for proper belt alignment and any abnormal noise.
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