ACCESSORY DRIVE BELT DIAGNOSIS CHART
CONDITION POSSIBLE CAUSES CORRECTION
RIB CHUNKING (One or more ribs
has separated from belt body)
1. Foreign objects imbedded in
pulley grooves.
1. Remove foreign objects from
pulley grooves. Replace belt.
2. Installation damage 2. Replace belt
RIB OR BELT WEAR 1. Pulley misaligned 1. Align pulley(s)
2. Abrasive environment 2. Clean pulley(s). Replace belt if
necessary
3. Rusted pulley(s) 3. Clean rust from pulley(s)
4. Sharp or jagged pulley groove
tips
4. Replace pulley. Inspect belt.
5. Belt rubber deteriorated 5. Replace belt
BELT SLIPS 1. Belt slipping because of
insufficient tension
1. Adjust tension (2.5L)
2. Belt or pulley exposed to
substance that has reduced friction
(belt dressing, oil, ethylene glycol)
2. Replace belt and clean pulleys
3. Driven component bearing failure
(seizure)
3. Replace faulty component or
bearing
4. Belt glazed or hardened from
heat and excessive slippage
4. Replace belt.
LONGITUDAL BELT CRACKING 1. Belt has mistracked from pulley
groove
1. Replace belt
2. Pulley groove tip has worn away
rubber to tensile member
2. Replace belt
9GROOVE JUMPING”
(Belt does not maintain correct
position on pulley)
1. Belt tension either too low or too
high
1. Adjust belt tension (2.5L)
2. Pulley(s) not within design
tolerance
2. Replace pulley(s)
3. Foreign object(s) in grooves 3. Remove foreign objects from
grooves
4. Pulley misalignment 4. Align component
5. Belt cordline is broken 5. Replace belt
BELT BROKEN
(Note: Identify and correct problem
before new belt is installed)
1. Excessive tension 1. Replace belt and adjust tension
to specification
2. Tensile member damaged during
belt installation
2. Replace belt
3. Severe misalignment 3. Align pulley(s)
4. Bracket, pulley, or bearing failure 4. Replace defective component
and belt
7 - 10 COOLING SYSTEM XJ
DIAGNOSIS AND TESTING (Continued)
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