Intake And Exhaust Manifold - Jeep cherokee 2000 Service Manual

XJ
REMOVAL AND INSTALLATION (Continued)

INTAKE AND EXHAUST MANIFOLD

REMOVAL
NOTE: THE ENGINE INTAKE AND EXHAUST MANI-
FOLD MUST BE REMOVED
TOGETHER. THE MANIFOLDS USE A COMMON
GASKET AT THE CYLINDER HEAD.
(1) Disconnect the battery negative cable.
(2) Remove air cleaner inlet hose from the resona-
tor assembly.
(3) Remove the air cleaner assembly.
(4) Remove the throttle cable, vehicle speed control
cable (if equipped) and the transmission line pres-
sure cable.
(5) Disconnect the following electrical connections
and secure their harness out of the way:
• Throttle Position Sensor
• Idle Air Control Motor
• Coolant Temperature Sensor (at thermostat
housing)
• Intake Air Temperature Sensor
• Oxygen Sensor
• Crank Position Sensor
• Six (6) Fuel Injector Connectors
• Manifold Absolute Pressure (MAP) Sensor.
(6) Disconnect HVAC, and Brake Booster vacuum
supply hoses at the intake manifold.
(7) Perform the fuel pressure release procedure.
(Refer to Group 14, Fuel Systems for correct proce-
dure)
(8) Disconnect and remove the fuel system supply
line from the fuel rail assembly. (Refer to Group 14,
Quick Connect Fittings for correct procedures)
(9) Remove the accessory drive belt (refer to Group
7, Cooling System). Loosen the tensioner.
(10) Remove the power steering pump from the
intake manifold and set aside.
(11) Raise the vehicle.
(12) Disconnect the exhaust pipes from the engine
exhaust manifolds.
(13) Lower the vehicle.
(14) Remove the intake manifold and engine
exhaust manifolds.
INSTALLATION
If the manifold is being replaced, ensure all the fit-
ting, etc. are transferred to the replacement mani-
fold.
(1) Install a new engine exhaust/intake manifold
gasket over the alignment dowels on the cylinder
head.
(2) Position the engine exhaust manifolds to the
cylinder head. Install fastener Number 3 and finger
tighten at this time (Fig. 50).
AND INSTALLED
(3) Install intake manifold on the cylinder head
dowels.
(4) Install washer and fastener Numbers 1, 2, 4, 5,
8, 9, 10 and 11 (Fig. 50).
(5) Install washer and fastener Numbers 6 and 7
(Fig. 50).
(6) Tighten the fasteners in sequence and to the
specified torque (Fig. 50).
• Fastener Numbers 1 through 5—Tighten to 33
N·m (24 ft. lbs.) torque.
• Fastener Numbers 6 and 7—Tighten to 31 N·m
(23 ft. lbs.) torque.
• Fastener Numbers 8 through 11—Tighten to 33
N·m (24 ft. lbs.) torque.
Fig. 50 Intake and Exhaust Manifolds—4.0L
(7) Install the power steering pump to the intake
manifold.
(8) Install the accessory drive belt. (Refer to Group
7, Cooling System for the correct procedures)
(9) Install the fuel system supply line to the fuel
rail assembly. Before connecting the fuel supply
line to the fuel rail inspect the O-rings and
replace if necessary. Refer to Group 14, Fuel
System for the correct procedure.
(10) Connect all electrical connections on the
intake manifold.
(11) Connect the
removed.
(12) Install throttle cable, vehicle speed control
cable (if equipped).
(13) Install the transmission line pressure cable (if
equipped). Refer to Group 21, Transmission for the
adjustment procedures.
(14) Install air cleaner assembly.
(15) Connect air inlet hose to the resonator assem-
bly.
(16) Raise the vehicle.
(17) Connect the exhaust pipes to the engine
exhaust manifolds. Tighten the bolts to 31 N·m (23
ft. lbs.)
4.0L ENGINE
vacuum hoses previously
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