Automatic Belt Tensioner - Jeep 1997 Grand Cherokee Service Manual

FAN BLADE
TURN CLOCKWISE TO REMOVE
ZG
REMOVAL AND INSTALLATION (Continued)
Fig. 65 Belt Tensioner—5.2/5.9L Engines
INSTALLATION
CAUTION: When installing serpentine accessory
drive belt, the belt must be routed correctly. If not,
engine may overheat due to water pump rotating in
wrong direction. Refer to (Fig. 66) for correct engine
belt routing. The correct belt with correct length
must be used.
(1) Position drive belt over all pulleys except idler
pulley. This pulley is located between generator and
A/C compressor.
(2) Attach a socket/wrench to pulley mounting bolt
of automatic tensioner (Fig. 65).
(3) Rotate socket/wrench clockwise. Place belt over
idler pulley. Let tensioner rotate back into place.
Remove wrench. Be sure belt is properly seated on
all pulleys.
(4) Check belt indexing marks. Refer to Automatic
Belt Tensioner.

AUTOMATIC BELT TENSIONER

NOTE: On 5.2/5.9L
equipped with an indexing arrow (Fig. 67) on back
of tensioner and an indexing mark on tensioner
housing. If a new belt is being installed, arrow must
be within approximately 3 mm (1/8 in.) of indexing
mark (point B-) (Fig. 67). Belt is considered new if it
has been used 15 minutes or less.
If the above specification cannot be met, check for:
• The wrong belt being installed (incorrect length/
width)
IDLER PULLEY TENSIONER
BELT
engines, the tensioner
*IF VEHICLE IS NOT EQUIPPED WITH POWER STEERING, THIS WILL BE AN IDLER PULLEY. AUTOMATIC TEN- SIONER
GEN.
Fig. 66 Belt Routing—5.2/5.9L Engines
• Worn bearings on an engine accessory (A/C com-
pressor, power steering pump, water pump, idler pul-
ley or generator)
• A pulley on an engine accessory being loose
• Misalignment of an engine accessory
• Belt incorrectly routed.
NOTE: A used belt should be replaced if tensioner
indexing arrow has moved to point-A (Fig. 67). Ten-
sioner travel stops at point-A.
REMOVAL
(1) Remove accessory drive belt. Refer to Belt
Replacement/Adjustment in this group.
(2) Disconnect wiring and secondary cable from
ignition coil.
(3) Remove ignition
bracket (two bolts). Do not remove coil mounting
bracket from cylinder head.
(4) Remove tensioner assembly from mounting
bracket (one nut) (Fig. 67).
WARNING: BECAUSE OF HIGH SPRING PRES-
is
SURE, DO NOT ATTEMPT TO DISASSEMBLE AUTO-
MATIC TENSIONER. UNIT IS SERVICED AS AN
ASSEMBLY (EXCEPT FOR PULLEY).
(5) Remove pulley bolt. Remove pulley from ten-
sioner.
INSTALLATION
(1) Install pulley and pulley bolt to tensioner.
Tighten bolt to 61 N·m (45 ft. lbs.) torque.
IDLER PULLEY WAT.PUMP IF W/OUT A/C
CRANK A/C COMP. PWR. STRG.
PULLEY PUMP
COOLING SYSTEM
coil from coil mounting
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