Checking the accessory drive belt

The accessory drive belt does not require tension adjustment during its entire service life, since its design provides for an automatic tensioner. If necessary, as well as according to the regulations, the belt is replaced (see «Accessory drive belt replacement»).

Perform an external inspection of the condition of the drive belt.



Replace the belt if, upon inspection, you find:

• signs of wear of the toothed surface, cracks, undercuts, folds and delamination of the fabric from the rubber;
• cracks, folds, depressions or bulges on the outer surface of the belt;
• loosening or delamination on the end surfaces of the belt;
• traces of oil on any surface of the belt.

Warning: A belt with traces of engine oil on any surface must be changed without fail, as the oil quickly destroys the rubber. Cause of oil on the belt (usually due to a leak in the crankshaft seals) must be eliminated immediately.

Note: An additional sign of the need to replace the accessory drive belt is a characteristic whistle (belt slip).