Perform the drive belt tensioner indicator mark inspection with the engine off at 60,000 mile (96,000 km) intervals.
Locate the tab on the mounting plate of the drive belt tensioner. The tab should be approximately between the stops of the drive belt tensioner arm.
- Tab in this area, belt length is incorrect. Replace belt.
- Tab in this area, belt OK.
- Tab in this area, belt worn or incorrect length. Replace belt.
Vehicles are equipped with V-ribbed (serpentine) accessory drive belts. To ensure maximum life, the replacement belt should be of the same type as the original. This system is equipped with an automatic belt tensioner that will maintain the correct tension on the belt and should not require any tension adjustment for the life of the belt. A worn belt can result in slippage, which may cause a noise concern or improper accessory operation.
Automatic tensioners do not have to be removed to remove a drive belt. To remove a drive belt, rotate the tensioner away from the belt.A/C Compressor
- Loosen the idler pulley bracket adjustment and pivot bolts.
- Position a suitable belt tension gauge at the point indicated in the figure.
- Install a 1 / 2 in. breaker bar in the hole in the idler pulley bracket as shown in the figure. Apply tension to the belt using the breaker bar.
- Set the tension on a new belt to 170 lbs. (231 Nm) or a used belt to 140 lbs. (190 Nm). While maintaining the tension, tighten the adjustment bolt to 30 ft. lbs. (40 Nm).
- Remove the belt tension gauge and the breaker bar. Start the engine and let it idle for 5 minutes.
- Shut the engine off, then reinstall the belt tension gauge and breaker bar. Apply tension with the breaker bar and slowly loosen the adjustment bolt to allow belt tension to increase to the used belt specification, 140 ft. lbs. (190 Nm). Tighten the adjustment bolt to 30 ft. lbs. (40 Nm).
- Tighten the pivot bolt to 50 ft. lbs. (68 Nm).
- Loosen the alternator pivot and adjustment bolts.
- Position a suitable belt tension gauge at the point indicated in the figure. Install an open end wrench over the alternator adjustment boss, then apply tension to the belt, using the wrench.
- Set the tension on a new belt to 170 ft. lbs. (231 Nm) or a used belt to 140 ft. lbs. (190 Nm). While maintaining the tension, tighten the alternator adjustment bolt to 29 ft. lbs. (39 Nm).
- Remove the belt tension gauge, start the engine and let it idle for 5 minutes.
- Shut off the engine and install the tension gauge. Apply tension with the open end wrench and slowly loosen the adjustment bolt to allow belt tension to increase to the used belt specification, 140 lbs. Tighten the adjustment bolt to 29 ft. lbs. (39 Nm).
- Tighten the pivot bolt to 50 ft. lbs. (68 Nm).
On some applications, a single belt is used to drive all of the engine accessories formerly driven by multiple drive belts. The single belt is referred to a serpentine belt. All the belt driven accessories are rigidly mounted with belt tension maintained by a spring-loaded tensioner. Because of the belt tensioner, no adjustment is necessary.
On other applications, a dual belt system is employed. Although the belts are still of a serpentine belt design, they must be adjusted to the proper tension manually. When making this adjustment, allow about 1 / 2 inch deflection when pushing on the longest run of the belt.
Cracks on the rib side of a drive belt are considered acceptable. If the drive belt has chunks missing from the ribs, if two or more adjacent ribs have lost sections, or if the missing chunks are creating a noise, vibrations, or harshness condition, replace the drive belt.
Drive Belt Routings
Inspect the drive belt 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.
The belts, which drive the engine accessories such as the alternator, the air pump, power steering pump, air conditioning compressor and water pump, are of serpentine belt design. Older style belts show wear and damage readily, since their basic design was a belt with a rubber casing. As the casing wore, cracks and fibers were readily apparent. Newer design, caseless belts do not show wear as readily, and many untrained people cannot distinguish between a good, serviceable belt and one that is worn to the point of failure. It is a good idea, therefore, to visually inspect the belt regularly and replace it, routinely, every two to three years.
Removal & Installation
- Remove the screws and position the power steering fluid reservoir out of the way.
- Remove the nut and the bolts and position the coolant reservoir bottle out of the way.
Lift or rotate the automatic drive belt tensioner away from the drive belt.
- Remove the drive belt.
Installation is the reverse of the removal procedure. Make sure drive belt is properly installed on each pulley.
- Tighten the coolant recovery bottler retainers to 80-106 inch lbs. (9-12 Nm).
- Tighten the power steering pump reservoir retainers to 54-61 inch lbs. (6-7 Nm).
- Insert a 1 / 2 inch flex handle in the square hole in the tensioner. The tensioner has a square hole cast into the rear of the tensioner body directly behind the pulley. Rotate the tensioner clockwise and remove the belt from the pulleys.
- Following the schematic on the decal under the hood, loop the drive belt over all the pulleys except the alternator pulley.
- With the belt installed properly on all except the alternator pulley, rotate the tensioner as described above and install the belt on the alternator pulley. Ensure that all the V-grooves make proper contact with the pulleys.
- Rotate the drive belt tensioner clockwise with a breaker bar installed in the 3 / 8 inch square hole in the drive belt tensioner.
- Lift the drive belt over the idler pulley flange and remove the drive belt.
- Following the schematic on the decal under the hood, position the belt over the pulleys, except the idler pulley.
- Rotate the tensioner as described above and install the belt on the idler. Ensure that all the V-grooves make proper contact with the pulleys.