Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 256
3.0L DIESEL
1. Install belt tensioner (5) on bracket. Torque retain-
ing bolt to 47 N·m.
2. Install accessory drive belt (Refer to 7 - COOLING/
ACCESSORY DRIVE/DRIVE BELTS - INSTALLA-
TION).
3. Connect negative battery cable.
7 - 28
ACCESSORY DRIVE
LX
DRIVE BELT
DIAGNOSIS AND TESTING
ACCESSORY DRIVE BELT
VISUAL DIAGNOSIS
When diagnosing serpentine accessory drive belts,
small cracks (1) that run across the ribbed surface of
the belt from rib to rib , are considered normal. These
are not a reason to replace the belt. However, cracks
(2) running along a rib (not across) are not normal.
Any belt with cracks running along a rib must be
replaced. Also replace the belt if it has excessive
wear, frayed cords, severe glazing or chunking.
Any belt with bumps, surface coming apart, or any
other uneven indications along the flat surface of the
belt must be remove and inspected and replaced if
necessary.
Refer to ACCESSORY DRIVE BELT DIAGNOSIS
CHART for further belt diagnosis.
NOISE DIAGNOSIS
Noises generated by the accessory drive belt are most noticeable at idle. Before replacing a belt to resolve a noise
condition, inspect all of the accessory drive pulleys for alignment, glazing, or excessive end play.
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
LX
ACCESSORY DRIVE
7 - 29
CONDITION
POSSIBLE CAUSES
CORRECTION
BELT SLIPS
1. Belt slipping because of
insufficient tension
1. Inspect/Replace tensioner if
necessary
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.
LONGITUDINAL BELT CRACKING
1. Belt has mis-tracked from pulley
groove
1. Replace belt
2. Pulley groove tip has worn away
rubber to tensile member
2. Replace belt
9
GROOVE JUMPING
9
(Belt does not maintain correct
position on pulley)
1. Incorrect belt tension
1. Inspect/Replace tensioner if
necessary
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 cord line is broken
5. Replace belt
BELT BROKEN
(Note: Identify and correct problem
before new belt is installed)
1. Incorrect belt tension
1. Replace Inspect/Replace
tensioner if necessary
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
NOISE
(Objectionable squeal, squeak, or
rumble is heard or felt while drive
belt is in operation)
1. Incorrect belt tension
1. Inspect/Replace tensioner if
necessary
2. Bearing noise
2. Locate and repair
3. Belt misalignment
3. Align belt/pulley(s)
4. Belt to pulley mismatch
4. Install correct belt
5. Driven component induced
vibration
5. Locate defective driven
component and repair
6. Belt flat surface coming apart
6. Replace belt
TENSION SHEETING FABRIC
FAILURE
(Woven fabric on outside,
circumference of belt has cracked or
separated from body of belt)
1. Tension sheeting contacting
stationary object
1. Correct rubbing condition
2. Excessive heat causing woven
fabric to age
2. Replace belt
3. Tension sheeting splice has
fractured
3. Replace belt
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ACCESSORY DRIVE
LX
CONDITION
POSSIBLE CAUSES
CORRECTION
CORD EDGE FAILURE
(Tensile member exposed at edges
of belt or separated from belt body)
1. Incorrect belt tension
1. Inspect/Replace tensioner if
necessary
2. Belt contacting stationary object
2. Replace belt
3. Pulley(s) out of tolerance
3. Replace pulley
4. Insufficient adhesion between
tensile member and rubber matrix
4. Replace belt
REMOVAL
2.7L ENGINE
CAUTION: Do not let tensioner arm snap back to
the freearm position, sever damage may occur to
the tensioner.
Belt tension is not adjustable. Belt adjustment is main-
tained by an automatic, spring loaded belt tensioner.
1. Disconnect negative battery cable from battery.
2. Rotate belt tensioner (5) counterclockwise until it
contacts it’s stop. Remove belt, then slowly rotate
the tensioner into the freearm position.
3.5L ENGINE
CAUTION: Do not let tensioner arm snap back to
the freearm position, sever damage may occur to
the tensioner.
Belt tension is not adjustable. Belt adjustment is main-
tained by an automatic, spring loaded belt tensioner.
1. Disconnect negative battery cable from battery.
2. Rotate belt tensioner (5) counterclockwise until it
contacts it’s stop. Remove belt, then slowly rotate
the tensioner into the freearm position.
LX
ACCESSORY DRIVE
7 - 31
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