Note: Correct adjustment of the drive belt tension prevents them from slipping, while not overloading the bearings of the units being serviced, which is especially important in the case of the generator and water pump.
Drive Belt Routing Diagram for 3.0L Engine Models
1 - Fan/water pump pulley; 2 - Air conditioner compressor pulley; 3 - steering pump pulley; 4 - tension roller; 5 - crankshaft pulley; 6 - generator; A = fan belt,; B = steering pump drive belt,; C = Air Conditioning Compressor Drive Belt
Belt routing on a 4.2L engine
1 - generator pulley; 2 - fan pulley; 3 - tension roller; 4 - steering pump pulley; 5 - Air conditioning compressor pulley; 6 - crankshaft pulley; A = fan belt,; B = steering pump drive belt,; C = Air Conditioning Compressor Drive Belt
Fan belt(s)
1. Press the fan belt(s) in the area midway between the alternator and water pump pulleys with a force of 98 N (thumb force). The required belt deflection is 4÷8 mm for 3.0 l models and 13÷15 mm for 4.2 l models.
Note: Be sure to replace belts as a set on 4.2L models.
2. If necessary, loosen the generator lock bolt and turn the adjusting bolt to achieve the required belt tension (by the magnitude of the deflection).
3. Tighten the generator lock bolt, run the engine for about five minutes and recheck the belt tension to ensure it is properly tensioned.
Steering pump drive belt
1. Press the drive belt in the area in the middle between the pulleys of the steering pump and the crankshaft with a force of 98 N (thumb force). The required belt deflection is 11÷15 mm for 3.0 L models and 15÷17 mm for 4.2 L models.
2. If necessary, loosen the steering pump lock bolt and turn the adjusting bolt to achieve the correct belt tension (by the magnitude of the deflection).
3. Tighten the steering pump lock bolt, start the engine for about five minutes, and recheck the belt tension.
Air Conditioning Compressor Drive Belt
1. Press the belt in the area in the middle between the pulleys of the air conditioner compressor and the crankshaft with a force of 98 N (thumb force). The required belt deflection is 6÷10 mm for 3.0 L models and 8÷10 mm for 4.2 L models.
2. If necessary, loosen the clamping nut in the center of the tension roller and turn the adjusting bolt to achieve the correct belt tension (by the magnitude of the deflection).
3. Tighten the tension roller lock nut, run the engine for about five minutes and recheck the belt tension.