Jeep Cherokee 1999 Electronic Service Manual page 1169

11 - 4 EXHAUST SYSTEM
REM OVAL AN D I N STALLAT I ON (Cont inue d)
Fig. 4 Catalytic Converter to Muffler and Exhaust
Pipe Connection
(3) In st a ll a n ew cla m p a t t h e m u ffler a n d ca t a -
lyt ic con ver t er con n ect ion (F ig. 4). Tigh t en t h e cla m p
n u t t o 61 N·m (45 ft . lbs.) t or qu e.
(4) Coa t t h e oxygen sen sor wit h a n t i-seize com -
pou n d. In st a ll t h e sen sor a n d t igh t en t h e n u t t o 27
N·m (20 ft . lbs.) t or qu e.
(5) Lower t h e veh icle.
(6) St a r t t h e en gin e a n d in spect for exh a u st lea ks
a n d exh a u st syst em con t a ct wit h t h e body pa n els.
Adju st t h e a lign m en t , if n eeded.
MUFFLER AND EXHAUST TAILPIPE
All or igin a l equ ipm en t exh a u st syst em s a r e m a n u -
fa ct u r ed wit h t h e exh a u st t a ilpipe welded t o t h e m u f-
fler. Ser vice r epla cem en t
t a ilpipes a r e eit h er cla m ped t oget h er or welded
t oget h er.
WARNING: IF TORCHES ARE USED WHEN WORK-
ING ON THE EXHAUST SYSTEM, DO NOT ALLOW
THE FLAME NEAR THE FUEL LINE.
CAUTION: When servicing exhaust system compo-
nents, disconnect the oxygen sensor connector.
Allowing the exhaust system to hang by the oxygen
sensor harness will damage the wiring and/or sensor.
REMOVAL
(1) Ra ise a n d su ppor t t h e veh icle.
(2) Discon n ect fr on t t a ilpipe h a n ger fr om t h e in su -
la t or (F ig. 5).
m u ffler s a n d exh a u st
(3) Rem ove t h e fr on t exh a u st cla m p fr om t h e ca t -
a lyt ic con ver t er a n d m u ffler con n ect ion (F ig. 6).
Fig. 5 Front Exhaust Tailpipe Hanger
Fig. 6 Catalytic Converter to Muffler Connection
(4) H ea t t h e ca t a lyt ic con ver t er-t o-m u ffler con n ec-
t ion wit h a n oxya cet ylen e t or ch u n t il t h e m et a l
becom es ch er r y r ed.
(5) Wh ile t h e m et a l is st ill ch er r y r ed, r em ove t h e
exh a u st m u ffler /t a ilpipe a ssem bly fr om t h e ca t a lyt ic
con ver t er.
(6) Slide t h e m u ffler /t a ilpipe a ssy. r ea r wa r d a n d
ou t of t h e r ea r exh a u st t a ilpipe m ou n t in g br a cket
(F ig. 7).
(7) Rem ove t h e m u ffler fr om t h e exh a u st t a ilpipe:
• To r em ove a n or igin a l equ ipm en t exh a u st m u f-
fler /t a ilpipe com bin a t ion , cu t t h e exh a u st t a ilpipe
X J