Dodge ram truck 3500 1996 Service Manual page 314

7 - 30 COOLING SYSTEM _ _ _ _ _ — _ — - — B R
DIAGNOSIS AND TESTING (Continued)
SERPENTINE DRIVE BELT DIAGNOSIS
CONDITION POSSIBLE CAUSES
CORRECTION
RIB CHUNKING (ONE
OR MORE RIBS HAS
SEPARATED FROM
BELT BODY
1. Foreign objects imbedded in
pulley grooves.
2. Installation damage.
1. Remove foreign objects from pulley
grooves. Replace belt.
2. Replace belt.
RIB OR BELT WEAR 1. Pulley(s) misaligned.
2. Abrasive environment.
3. Rusted pulley(s).
4. Sharp or jagged pulley
groove tips.
5. Rubber deteriorated.
1. Align pulley(s).
2. Clean pulley(s). Replace belt if necessary.
3. Clean rust from pulley(s).
4. Replace pulley.
5. Replace belt.
LONGITUDINAL BELT
CRACKING (CRACKS
BETWEEN TWO RIBS)
1. Belt has mistracked from
pulley groove.
2. Pulley groove tip has worn
away rubber to tensile
member.
1. Replace belt.
2. Replace belt.
BELT SLIPS 1. Belt slipping
because
of
insufficient tension.
2. Incorrect belt.
3. Belt or pulley subjected to
substance (belt dressing, oil,
ethylene glycol) that has
reduced friction.
4. Driven component bearing
failure.
5. Belt glazed and hardened
from heat and excessive
slippage.
1.
Replace
automatic belt tensioner.
2. Replace belt.
3. Replace belt and clean pulleys.
4. Replace fauity component bearing.
5. Replace belt.
"GROOVE JUMPING"
(BELT DOES NOT
MAINTAIN CORRECT
POSITION ON PULLEY)
1. Belt tension either too high or
too low.
2. Incorrect belt.
3. Pulley(s) not within design
tolerance.
4. Foreign object(s) in grooves.
4. Pulley misalignment.
5. Belt cordline is broken.
1. Replace automatic belt tensioner.
2. Replace belt.
3. Replace pulley(s).
4. Remove foreign objects from grooves.
4. Check and replace.
5. Replace belt.
BELT BROKEN
(NOTE: IDENTIFY AND
CORRECT PROBLEM
BEFORE NEW BELT
IS INSTALLED)
1. Excessive tension,
2. Incorrect belt.
3. Tensile member damaged
during belt installation.
4. Severe misalignment.
5. Bracket, pulley, or bearing
failure.
1. Replace belt and automatic belt tensioner.
2. Replace belt.
3. Replace belt.
4. Check and replace.
5. Replace defective component and belt.
NOISE (OBJECTIONAL
SQUEAL, SQUEAK, OR
RUMBLE IS HEARD OR
FELT WHILE DRIVE
BELT IS IN OPERATION)
1. Belt slippage.
2. Bearing noise.
3. Belt misalignment.
4. Belt-to-pulley mismatch.
1. Replace belt or automatic belt tensioner.
2. Locate and repair.
3. Replace belt.
j
4. Install correct belt. |
J9507-27