ACCESSORY DRI V E
TABLE OF CONTENTS
page page
BELT TENSIONERS
DESCRIPTION ..........................5
OPERATION ............................5
DRIVE BELTS
DIAGNOSIS AND TESTING - ACCESSORY
DRIVE BELT ..........................5
REMOVAL
REMOVAL ............................8
REMOVAL ............................8
INSTALLATION
INSTALLATION ........................8
INSTALLATION ........................8
BELT T EN SI ON ERS
DESCRIPTION
CAUTION: Do not attempt to check belt tension with
a belt tension gauge on vehicles equipped with an
automatic belt tensioner.
Drive belt s on all en gines are equipped with a
spring loaded au tomatic belt tensioner. This t en-
sioner maintains constant belt ten sion at all tim es
and requir es no ma int enan ce or adjustment. (F ig. 1)
OPERATION
WARNING: The automatic belt tensioner assembly
is spring loaded. do not attempt to disassemble the
tensioner assembly.
The aut omatic belt tensioner ma intains correct belt
tension using a coiled spring within th e ten sioner
housin g. Th e spring applies pressur e to th e tensioner
arm pressing the a rm int o the belt , tensionin g th e
belt .
If a new belt is bein g insta lled, th e arrow must be
with in approximately 3 mm (1/8 in . ) of indexing
mark. Belt is consider ed new if it has been used 15
minutes or less. If th is specificat ion cannot be met,
check for:
• Th e wrong belt being installed (incorrect lengt h/
widt h )
• Worn bear ings on an engine accessor y (A/C com -
pr essor, power steer ing pump, water pump, idler pul-
ley or generat or)
• A pulley on an engine a ccessory being loose
• Misalign ment of a n engine a ccessory
• Belt in correct ly r outed.
DRI V E BELT S
DIAGNOSIS AND TESTING - ACCESSORY
DRIVE BELT
VISUAL DIAGNOSIS
When dia gnosing serpent ine accessor y drive belts,
sm all cracks th at r un across the ribbed surface of t he
belt from rib to r ib (Fig. 2), are consider ed normal.
These a re n ot a reason to replace t he belt. However,
cracks runn ing along a rib (not across) are not nor-
mal. Any belt with cr acks r unning along a rib m ust
be replaced (F ig. 2). Also r eplace the belt if it has
excessive wea r, fra yed cords or severe gla zing.
Refer to ACCESSORY DRIVE BE LT DIAGNOSIS
CHART for fu rther belt dia gnosis.
Fig. 1 Accessory Drive Belt
1 - WATER PUMP
2 - ACCESSORY DRIVE BELT
3 - AUTOMATIC BELT TENSIONER
4 - 3/8$ SQUARE BOLT
5 - MOUNT. BOLT
VA ACCESSORY DRIVE 7 - 5
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