Inspect the belts for signs of glazing or cracking. A glazed belt will be perfectly smooth from slippage, while a good belt will have a slight texture of fabric visible. Cracks will usually start at the inner edge of the belt and run outward. All worn or damaged drive belts should be replaced immediately. It is best to replace all drive belts at one time, as a preventive maintenance measure, during this service operation.
Check belt tension. For 2.5L engines, tension is checked with a belt tension gauge. For models with automatic tensioners, alignment marks are used to indicate proper position when belt replacement is required:
For 4.7L engines:
Check the belt if the distance between index marks exceeds 0.94 in. (24 mm).
For other engines
Check the belt if indexing arrow has moved to the tensioner travel limit as shown in the illustration. The arrow should be within 1 / 8 inch (3mm) of the indexing mark if a new belt is installed.
If wear indicators show that belt replacement is needed, check that belt wear is the cause. False readings can be caused by loose or worn pulleys, damaged bearings, loose or misaligned accessories or incorrectly fitted belts.
The 2.5L engine requires periodic adjustment. All other models are fitted with automatic belt tensioners. Be sure, however, to inspect/replace the belts at the proper intervals.Belt Adjustment (2.5L)
Belt tension is adjusted at the power steering pump bracket and idler pulley assembly. This procedure requires the use of a belt tension gauge.
- Disconnect the battery negative cable.
- Loosen the idler pulley center bolt.
- Using the adjusting bolt, tension the belt to 140-160 lbs. for in-service belts. Tension for new belts (used 15 mins. or less) should be 180-200 lbs.)
- Tighten the idler pulley center bolt to 42 ft. lbs. (57 Nm)
- Recheck the belt tension.
REMOVAL & INSTALLATION
- Loosen the idler pulley bolt, then the adjusting bolt to remove tension from the belt.
- Remove the belt.
- Check the pulleys for damage.
- Install the belt per the appropriate diagram.
- Adjust tension as described in the "Belt Adjustment (2.5L)" section, above.
Use a socket, wrench or ratchet on the tensioner pulley to rotate the tensioner arm, loosen the belt and disengage it from one of the fixed pulleys. To install, place the belt over all pulleys but the tensioner pulley, then rotate the tensioner arm in the same manner and slip the belt over the pulley. When you release it, the spring-loaded tensioner will automatically apply the correct tension to the belt.
- Disconnect the negative battery cable.
- Attach the proper size socket, wrench, or ratchet to the automatic belt tensioner pulley bolt or square hole.
- Rotate the tensioner arm until tension has been removed from the belt.
- Remove the belt from the tensioner pulley, and then slowly allow the tensioner arm to rotate back until it stops.
- Remove the belt from the remaining pulleys.
- Position the belt over all of the pulleys except the tensioner.
- Attach the proper size socket, wrench, or ratchet to the automatic belt tensioner pulley bolt.
- Rotate the tensioner until the stop is reached. Carefully position the belt over the tensioner pulley and release it slowly until it contacts the belt.
- Check the tensioner indexing marks to make sure the proper new belt is installed and the tensioner is not worn beyond its limits.
- Check to make sure the belt is seated properly on all the pulleys. Check for proper belt routing.
- Connect the negative battery cable.
- Start the engine and observe the belt to ensure proper operation.