Initial Inspection and Diagnostic Overview

1. Verify the customer's concern(s) by operating the engine to duplicate the condition.





2. Inspect to determine if any of these mechanical concerns apply.
3. Inspect for drive belt cracking/chunking/wear.
4. If the concern(s) remain after the inspections, determine the symptoms and go to the Symptom Chart.

Drive Belt Cracking/Chunking/Wear
- Under severe operating conditions (high temperatures, low humidity), drive belt rib cracking can occur at less than 160,000 km (100,000 miles). Drive belt rib cracking:
- is not a reason for concern.
- has no detrimental effect on drive belt performance.








The drive belt is still perfectly functional until rib chunking occurs. Drive belt chunking is where the rubber material actually chunks out between the cracks. The drive belt should be replaced if chunking occurs.