Jeep Cherokee 1999 Electronic Service Manual page 1089

9 - 72 4.0L ENGINE
REM OVAL AN D I N STALLAT I ON (Cont inue d)
INTAKE MANIFOLD—4.0L ENGINE
Th e in t a ke a n d en gin e exh a u st m a n ifolds on t h e
4.0L en gin e m u st be r em oved a n d in st a lled t oget h er.
Th e t wo m a n ifolds u se a com m on ga sket a t t h e cyl-
in der h ea d.
REMOVAL
(1) Discon n ect t h e ba t t er y n ega t ive ca ble.
(2) Rem ove a ir clea n er in let h ose fr om t h r ot t le
pla t e a ssem bly.
(3) Rem ove t h e a ir clea n er a ssem bly.
(4) Rem ove t h e t h r ot t le ca ble, cr u ise con t r ol ca ble
(if equ ipped) a n d t h e t r a n sm ission lin e pr essu r e
ca ble.
(5) Discon n ect t h e cr a n kca se ven t ila t ion (CCV)
va cu u m h ose a n d m a n ifold a bsolu t e pr essu r e (MAP )
sen sor va cu u m h ose con n ect or a t t h e in t a ke m a n i-
fold.
(6) Discon n ect va cu u m h ose fr om va cu u m por t on
t h e in t a ke m a n ifold.
(7) Discon n ect CCV h ose a t t h e cylin der h ea d
cover (F ig. 29).
Fig. 29 Crankcase Ventilation (CCV) Hose —4.0L
(8) P er for m fu el syst em pr essu r e r elea se pr ocedu r e
(r efer t o Gr ou p 14, F u el Syst em for cor r ect pr oce-
du r e).
(9) Rem ove fu el su pply lin e la t ch clip a t in ject or
r a il.
(10) Discon n ect fu el su pply t u be fr om t h e fu el r a il.
Som e fu el lin es r equ ir e a specia l t ool for r em ova l/in -
st a lla t ion (r efer t o Gr ou p 14, F u el Syst em - Qu ick
Con n ect F it t in gs).
Engine
(11) Discon n ect a ll elect r ica l con n ect or s on t h e
in t a ke m a n ifold.
• Th e t h r ot t le posit ion sen sor.
• Th e idle a ir con t r ol m ot or.
• Th e coola n t t em per a t u r e sen sor a t t h e t h er m o-
st a t .
• Th e m a n ifold a ir t em per a t u r e sen sor a t t h e
in t a ke m a n ifold.
• Th e fu el in ject or s.
• Th e oxygen sen sor.
(12) Loosen t h e a ccessor y dr ive belt t en sion a n d
r em ove t h e belt fr om t h e power st eer in g pu m p (r efer
t o Gr ou p 07, Coolin g Syst em s for pr oper pr ocedu r es).
(13) Rem ove t h e power st eer in g pu m p a n d br a cket
fr om t h e in t a ke m a n ifold a n d wa t er pu m p a n d set
a side.
(14) Ra ise t h e veh icle.
(15) Discon n ect t h e exh a u st pipe fr om t h e en gin e
exh a u st m a n ifold. Disca r d t h e sea l.
(16) Lower t h e veh icle.
(17) Rem ove t h e in t a ke m a n ifold a n d en gin e
exh a u st m a n ifold.
INSTALLA TION
(1) Clea n t h e m a t in g su r fa ces of t h e cylin der h ea d
a n d t h e m a n ifold if t h e or igin a l m a n ifold is t o be r e-
in st a lled.
(1) If t h e m a n ifold is bein g r epla ced, en su r e a ll t h e
sen sor s, fit t in gs, et c. a r e t r a n sfer r ed t o t h e r epla ce-
m en t m a n ifold.
(2) In st a ll a n ew exh a u st /in t a ke m a n ifold ga sket
over t h e a lign m en t dowels on t h e cylin der h ea d.
(3) P osit ion t h e en gin e exh a u st m a n ifold t o t h e
cylin der h ea d. In st a ll fa st en er No.3 a n d fin ger
t igh t en a t t h is t im e (F ig. 30).
(4) In st a ll in t a ke m a n ifold on t h e cylin der h ea d
dowels.
(5) In st a ll wa sh er s a n d fa st en er s Nos.1, 2, 4, 5, 8,
9, 10 a n d 11 (F ig. 30).
(6) In st a ll wa sh er s a n d fa st en er s Nos.6 a n d 7 (F ig.
30).
(7) Tigh t en t h e fa st en er s in sequ en ce a n d t o t h e
specified t or qu e (F ig. 30).
• F a st en er s Nos.1 t h r ou gh 5—Tigh t en t o 33 N·m
(24 ft . lbs.) t or qu e.
• F a st en er s Nos.6 a n d 7—Tigh t en t o 31 N·m (23
ft . lbs.) t or qu e.
• F a st en er s Nos.8 t h r ou gh 11—Tigh t en t o 33 N·m
(24 ft . lbs.) t or qu e.
(8) In st a ll t h e power st eer in g pu m p a n d br a cket t o
t h e in t a ke m a n ifold a n d wa t er pu m p. Tigh t en t h e
belt t o specifica t ion (Refer t o Gr ou p 7, Coolin g Sys-
t em for t h e pr oper pr ocedu r es).
(9) Con n ect fu el su pply t u be t o t h e fu el r a il in let .
P u sh t u be u n t il a "click" is h ea r d. B e fo re c o n n e c t-
X J