Ribbed belt, W12 (6.0 MPI) and 10-cylinder gasoline engines (5.2 FSI), checking
Check guide rollers and tensioner rollers and replace if necessary.
Check ribbed belt - 1 - for:
- Sub-surface cracks (cracks, core ruptures, cross sectional breaks)
- Layer separation (top layer, cord strands)
- Base break-up
- Fraying of cord strands
- Flank wear (material wear, frayed flanks, flank brittleness -glassy flanks-, surface cracks)
- Traces of oil and grease
NOTE:
- Replace the belt if any damage is found. This will avoid possible break-downs or operating problems. The replacement of a ribbed belt is a repair measure