Jeep Grand Cherokee WK. Manual — part 1245
4.7L ENGINE
1. Position steady rest bracket (4) onto the front
exhaust pipe/catalytic converter assembly (3).
2. Position the front exhaust pipe/catalytic converter
assembly (4) into vehicle.
3. Install the bolts (2) and nuts (1) at the front exhaust
pipe/catalytic converter assembly (3) to exhaust
manifold flange. Do not tighten.
4. Install the nuts at the front exhaust pipe/catalytic
converter assembly to muffler flange. Do not
tighten.
5. Position the exhaust pipe for proper clearance with
the frame and underbody parts. A minimum clear-
ance of 25.4 mm (1.0 in.) is required.
6. Tighten
front
exhaust
pipe/catalytic
converter
assembly to exhaust manifold bolts (2) to 25.7 N·m
(19 in. lbs.) torque.
7. Tighten the front exhaust pipe and catalytic con-
verter assembly to muffler flange nuts to 47 N·m
(35 ft. lbs.) torque.
8. Install steady rest bracket bolts. Tighten bolts to 47 N·m (35 ft. lbs.).
9. Connect oxygen sensor electrical connectors.
10. Install transmission crossmember (Refer to 13 - FRAME & BUMPERS/FRAME/REAR CROSSMEMBER -
INSTALLATION)
11. Lower vehicle.
12. Start the vehicle and inspect for exhaust leaks. Repair exhaust leaks as necessary.
5.7L ENGINE
1. Position steady rest bracket (4) onto the front
exhaust pipe/catalytic converter assembly (3).
2. Position the front exhaust pipe/catalytic converter
assembly (4) into vehicle.
3. Install the bolts (2) and nuts (1) at the front exhaust
pipe/catalytic converter assembly (3) to exhaust
manifold flange. Do not tighten.
4. Install the nuts at the front exhaust pipe/catalytic
converter assembly to muffler flange. Do not
tighten.
5. Position the exhaust pipe for proper clearance with
the frame and underbody parts. A minimum clear-
ance of 25.4 mm (1.0 in.) is required.
6. Tighten
front
exhaust
pipe/catalytic
converter
assembly to exhaust manifold bolts (2) to 25.7 N·m
(19 in. lbs.) torque.
7. Tighten the front exhaust pipe and catalytic con-
verter assembly to muffler flange nuts to 47 N·m
(35 ft. lbs.) torque.
8. Install steady rest bracket bolts. Tighten bolts to 47 N·m (35 ft. lbs.).
9. Connect oxygen sensor electrical connectors.
11 - 8
EXHAUST SYSTEM
WK
10. Install transmission crossmember (Refer to 13 - FRAME & BUMPERS/FRAME/REAR CROSSMEMBER -
INSTALLATION)
11. Lower vehicle.
12. Start the vehicle and inspect for exhaust leaks. Repair exhaust leaks as necessary.
MUFFLER
DESCRIPTION
All engines use a stainless steel muffler and tailpipe
assembly to control exhaust noise levels and exhaust
back pressure. The 3.7L/4.7L muffler and tailpipe are
a one piece assembly.
The 5.7L tailpipe is serviced separately.
WK
EXHAUST SYSTEM
11 - 9
REMOVAL
3.7L/4.7L ENGINE
1. Raise the vehicle and support the rear of the vehi-
cle by the side rails and allow the axle to hang
free.
2. Saturate the bolts and nuts (2) with heat valve
lubricant. Allow 5 minutes for penetration.
3. Position a jackstand under the rear axle.
4. Remove RH rear shock absorber (Refer to 2 -
SUSPENSION/REAR/SHOCK - REMOVAL) and
RH side of stabilizer bar (Refer to 2 - SUSPEN-
SION/REAR/STABILIZER BAR - REMOVAL).
5. Remove the front exhaust pipe/catalytic converter
to muffler/tailpipe assembly flange nuts (2) and
ground strap (5).
6. Remove tailpipe/muffler assembly (3) from Isola-
tors.
7. Remove the muffler/tailpipe assembly (3) from
vehicle.
5.7L ENGINE
1. Raise the vehicle and support the rear of the vehi-
cle by the side rails and allow the axle to hang
free.
2. Saturate the bolts and nuts with heat valve lubri-
cant. Allow 5 minutes for penetration.
3. Remove muffler from isolator.
4. Remove the tailpipe/resonator to muffler assembly
flange nuts.
5. Remove the front exhaust pipe/catalytic converter
to muffler flange nuts.
6. Remove muffler from vehicle.
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EXHAUST SYSTEM
WK
INSTALLATION
3.7L/4.7L ENGINE
1. Position muffler and tailpipe assembly in vehicle.
2. Install insulators.
3. Install bolts and nuts (2) and ground strap (5) at
front exhaust pipe/catalytic converter flange (1)
4. Make sure the muffler/tailpipe assembly is correctly
positioned and the properly aligned. The minimum
clearance between components is 25mm (1 inch).
5. Tighten nuts (2) to 47 N·m (35 ft. lbs.).
6. Install RH shock absorber (Refer to 2 - SUSPEN-
SION/REAR/SHOCK - INSTALLATION) and sta-
blizer bar (Refer to 2 - SUSPENSION/REAR/
STABILIZER BAR - INSTALLATION).
7. Lower the vehicle.
8. Start the engine and inspect for exhaust leaks.
Repair exhaust leaks as necessary.
INSTALLATION
1. Position muffler in vehicle.
2. Install front exhaust pipe/catalytic converter to muf-
fler flange nuts. Do not tighten at this time.
3. Install tailpipe/resonator assembly to muffler flange
gasket and nuts. Do not tighten at this time.
4. Install rear insloator.
5. Make sure the muffler/tailpipe assembly is correctly
positioned and the properly aligned. The minimum
clearance between components is 25mm (1 inch).
6. Tighten flange nuts to 47 N·m (35 ft. lbs.).
7. Lower the vehicle.
8. Start the engine and inspect for exhaust leaks.
Repair exhaust leaks as necessary.
WK
EXHAUST SYSTEM
11 - 11
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