Serpentine Drive Beit Diagnosis - Jeep 1987 Wrangler Workshop Manual

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E1SS1ES
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COOLING SYSTEMS
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Serpentine Drive Beit Diagnosis
Condition Possible Cause Correction
TENSION SHEETING
FABRIC FAILURE
(WOVEN FABRIC ON
OUTSIDE CIRCUM-
FERENCE OF BELT
HAS CRACKED OR
SEPARATED FROM
BODY OF BELT)
(1) Grooved or backside idler pulley
diameters are less than minimum
recommended,
(2) Tension sheeting contacting
(rubbing) stationary object.
(3) Excessive heat causing woven
fabric to age.
(4) Tension sheeting splice has
fractured.
(1) Replace pulley(s) not conforming
to specification.
(2) Correct rubbing condition.
(3) Replace belt.
(4) Replace belt.
NOISE
(OBJBCTIONAL
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.
(5) Driven component inducing
vibration.
(6) System resonant frequency
inducing vibration.
(1) Adjust belt.
(2) Locate and repair.
(3) Align belt/pulley(s).
(4) Install correct belt.
(5) Locate defective driven component
and repair.
(6) Vary belt tension within
specifications. Replace belt.
RIB CHUNKING
; (ONE OR MORE R I M
HAS SEPARATED
FROM BELT BODY)
(1) Foreign objects imbedded in
pulley grooves.
(2) Installation damage.
(3) Drive loads in excess of design
specifications.
(4) Insufficient internal belt adhesion.
(1) Remove foreign objects from
pulley grooves.
(2) Replace belt.
(3) Adjust belt tension.
(4) Replace belt.
RIB OR BELT WEAR
(BELT RIBS CONTACT
BOTTOM OF PULLEY
GROOVES)
(1) Pulley(s) misaligned.
(2) Mismatch of belt and pulley
groove widths.
(3) Abrasive environment.
(4) Rusted pulley(s)
(5) Sharp or jagged pulley groove tips.
(6) Rubber deteriorated.
(1) Align pulley(s).
(2) Replace belt.
(3) Replace belt.
(4) Clean rust from pulley(s).
(5) Replace pulley.
(6) 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.
81102
B-194