DaimlerChrysler SPRINTER2006 Service Manual page 40

7 - 6 ACCESSORY DRIVE
Fig. 2 Belt Wear Patterns
1 - NORMAL CRACKS BELT OK
2 - NOT NORMAL CRACKS REPLACE BELT
NOISE DIAGNOSIS
Noises generated by the accessory drive belt are
most noticeable at idle. Before replacing a belt to
CONDITION
RIB CHUNKING (One or more ribs
has separated from belt body)
RIB OR BELT WEAR
BELT SLIPS
ACCESSORY DRIVE BELT DIAGNOSIS CHART
POSSIBLE CAUSES
1. Foreign objects imbedded in
pulley grooves.
2. Installation damage
1. Pulley misaligned
2. Abrasive environment
3. Rusted pulley(s)
4. Sharp or jagged pulley groove
tips
5. Belt rubber deteriorated
1. Belt slipping because of insuffi-
cient tension
2. Belt or pulley exposed to sub-
stance that has reduced friction
(belt dressing, oil, ethylene glycol)
3. Driven component bearing fail-
ure (seizure)
4. Belt glazed or hardened from
heat and excessive slippage
resolve a noise condition, inspect all of the accessory
drive pulleys for contamination, alignment, glazing,
or excessive end play.
1. Remove foreign objects from
pulley grooves. Replace belt.
2. Replace belt
1. Align pulley(s)
2. Clean pulley(s). Replace belt if
necessary
3. Clean rust from pulley(s)
4. Replace pulley. Inspect belt.
5. Replace belt
1. Inspect/Replace tensioner if nec-
essary
2. Replace belt and clean pulleys
3. Replace faulty component or
bearing
4. Replace belt.
VA
CORRECTION