Jeep 1997 Grand Cherokee Service Manual page 341

ZG
GENERAL INFORMATION
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . 1
DIAGNOSIS AND TESTING
VACUUM PUMP TEST . . . . . . . . . . . . . . . . . . . . 1
GENERAL INFORMATION
INTRODUCTION
The generator used on the 2.5L diesel engine is
equipped with a built-on vacuum pump. This pump,
in conjunction with a second vacuum pump located
within the engine, will supply vacuum for: the heat/
A-C system, and power brake booster.
The generator/vacuum pump assembly is serviced
as one part. If the pump or generator should be
faulty, replace the entire assembly. The only service-
able part is the drive pulley.
DIAGNOSIS AND TESTING
VACUUM PUMP TEST
Refer to Group 5, Brake System for vacuum pump
information and testing.
REMOVAL AND INSTALLATION
GENERATOR
WARNING: DISCONNECT NEGATIVE CABLE FROM
BATTERY BEFORE REMOVING BATTERY OUTPUT
WIRE FROM GENERATOR. FAILURE TO DO SO
CAN RESULT IN INJURY.
CAUTION: Never force a belt over a pulley rim
using a screwdriver. The synthetic fiber of the belt
can be damaged.
CAUTION: When installing a serpentine accessory
drive belt, the belt MUST be routed correctly. The
water pump will be rotating in the wrong direction if
the belt is installed incorrectly, causing the engine
to overheat. Refer to belt routing label in engine
compartment, or refer to Belt Schematics in Group
7, Cooling System.
CHARGING SYSTEM
CONTENTS
page
REMOVAL AND INSTALLATION
GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SPECIFICATIONS
SPECIFICATIONS
(1) Disconnect negative battery cable.
(2) Remove generator/vacuum pump drive belt.
Refer to Group 7, Cooling System for procedure.
(3) Remove the nut securing battery output cable
to B+ terminal (Fig. 1) at rear of generator.
(4) Unplug field terminal connector (Fig. 1) at rear
of generator.
(5) Remove vacuum hose from upper vacuum hose
fitting on vacuum pump (Fig. 2).
(6) Remove upper generator mounting bolt.
(7) Loosen, but do not remove, the lower generator
mounting bolt as required to gain access to vacuum
pump oil lines.
(8) Place a drain pan below generator to catch oil
from vacuum pump.
(9) Remove banjo bolt retaining oil feed hose (Fig.
3) at bottom of vacuum pump.
(10) Loosen hose clamp and remove oil return hose
(Fig. 2) from fitting at bottom of pump.
(11) Remove lower generator mounting bolt and
remove generator/vacuum pump from vehicle.
(12) Reverse the removal procedures for installa-
tion. Tighten hardware in order as follows:
• Banjo Bolt (Vacuum Pump Oil Feed Hose)—15
N·m (11 ft. lbs.)
• Upper Generator Mounting Bolt—27.5 N·m (20
ft. lbs.)
• Lower Generator Mounting Bolt—47 N·m (35 ft.
lbs.)
• Battery Terminal (generator B+ terminal) Nut—
8.5 N·m (75 in. lbs.)
CHARGING SYSTEM
. . . . . . . . . . . . . . . . . . . . . . . 2
8C - 1
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