Installation - 4.0L; Heat Shields; Description; Removal - Chrysler Vehicle User Manual

11 - 8 EXHAUST SYSTEM
EXHAUST PIPE (Continued)
(9) Lower vehicle.
(10) Start engine check for leaks.
INSTALLATION — 4.0L
(1) Position exhaust pipe and catalytic converter
into vehicle.
(2) Insert exhaust pipe hanger into transmission
support (Fig. 6).
(3) Install exhaust pipe onto exhaust manifold DO
NOT tighten bolts at this time.
(4) Position muffler flange onto catalytic converter
flange and install retaining bolts and nuts (Fig. 6).
DO NOT tighten nuts at this time.
(5) Make sure the exhaust system is aligned and
has the proper clearance. The minimum clearance is
25mm (1 inch).
(6) Tighten muffler to catalytic converter flange
retaining nuts to 28.5 N·m (21 ft. lbs.).
(7) Tighten exhaust pipe to exhaust manifold
mounting bolts to 31 N·m (23 ft. lbs.).
(8) Install the oxygen sensors in the exhaust pipe
and catalytic converter.
(9) Lower vehicle.
(10) Start engine check for leaks.

HEAT SHIELDS

DESCRIPTION

Heat shields (Fig. 7) are made of stamped/formed
steel, or metal foil.
Exhaust heat shields are needed to protect both
the vehicle and the environment from the high tem-
peratures developed by the catalytic converter. The
catalytic converter releases additional heat into the
exhaust system. Under severe operating conditions,
the temperature increases in the area of the con-
verter. Such conditions can exist when the engine
misfires or otherwise does not operate at peak effi-
ciency.

REMOVAL

(1) Raise and support the vehicle.
(2) Remove the screws and/or nuts holding the
heat shields to the frame and/or floor pan (Fig. 8)
and (Fig. 9).
(3) When removing muffler heat shield, the muf-
fler front support bracket must be removed first.
(4) Slide the shields out around the exhaust sys-
tem.
Fig. 7 Exhaust Heat Shield - Typical
1 - HEAT SHIELD
Fig. 8 Muffler Heat Shield - Rear
1 - MUFFLER HEAT SHIELD - REAR
2 - NUTS
3 - SELF TAPPING SCREWS
TJ