Jeep Cherokee 1999 Electronic Service Manual page 326

X J
REM OVAL AN D I N STALLAT I ON (Cont inue d)
Fig. 29 Slot At 11 O'clock Position—4.0L Engine
(2) Ch eck posit ion of slot on oil pu m p gea r. On t h e
2.5L en gin e, it sh ou ld be ju st sligh t ly befor e (cou n t er-
clockwise of) 10 o'clock posit ion (F ig. 28). On t h e 4.0L
en gin e, it sh ou ld be ju st sligh t ly befor e (cou n t er clock-
wise of) 11 o'clock posit ion (F ig. 29). If n ot , pla ce a
fla t bla de scr ewdr iver in t o oil pu m p gea r a n d r ot a t e
it in t o pr oper posit ion .
(3) F a ct or y r epla cem en t dist r ibu t or s a r e equ ipped
wit h a pla st ic a lign m en t pin a lr ea dy in st a lled (F ig.
25). Th is pin is u sed t o t em por a r ily h old r ot or t o cyl-
in der n u m ber 1 fir in g posit ion du r in g dist r ibu t or
in st a lla t ion . If pin is in pla ce, pr oceed t o St ep 8. If
n ot , pr oceed t o n ext st ep.
(4) If or igin a l dist r ibu t or is t o be r ein st a lled, su ch
a s du r in g en gin e over h a u l, t h e pla st ic pin will n ot be
a va ila ble. A 3/16 in ch dr ift pin pu n ch t ool m a y be
su bst it u t ed for pla st ic pin .
(5) Rem ove ca m sh a ft posit ion sen sor fr om dist r ib-
u t or h ou sin g. Lift st r a igh t u p.
(6) F ou r differ en t a lign m en t h oles a r e pr ovided on
pla st ic r in g (F ig. 30). N o te th a t 2.5L a n d 4.0L
e n g in e s h a v e d iffe re n t a lig n m e n t h o le s (F ig .
30).
(7) Rot a t e dist r ibu t or sh a ft a n d in st a ll pin pu n ch
t ool t h r ou gh pr oper a lign m en t h ole in pla st ic r in g
(F ig. 30) a n d in t o m a t in g a ccess h ole in dist r ibu t or
h ou sin g. Th is will pr even t dist r ibu t or sh a ft a n d r ot or
fr om r ot a t in g.
(8) Clea n dist r ibu t or m ou n t in g h ole a r ea of en gin e
block.
(9) In st a ll n ew dist r ibu t or-t o-en gin e block ga sket
(F ig. 26).
(10) In st a ll r ot or t o dist r ibu t or sh a ft .
(11) 2.5L 4-Cy lin d e r En g in e : P r e-posit ion dist r ib-
u t or in t o en gin e wh ile h oldin g cen t er lin e of ba se slot
in 1 o'clock posit ion (F ig. 31). Con t in u e t o en ga ge dis-
t r ibu t or in t o en gin e. Th e r ot or a n d dist r ibu t or will
r ot a t e clockwise du r in g in st a lla t ion . Th is is du e t o
t h e h elica l cu t gea r s on dist r ibu t or a n d ca m sh a ft .
Fig. 30 Pin Alignment Holes
Wh en dist r ibu t or is fu lly sea t ed t o en gin e block, t h e
cen t er lin e of ba se slot sh ou ld be a lign ed t o cla m p bolt
m ou n t in g h ole on en gin e (F ig. 32). Th e r ot or sh ou ld
a lso be poin t ed sligh t ly pa st (clockwise of) 3 o'clock
posit ion .
4.0L 6-Cy lin d e r En g in e : P r e-posit ion dist r ibu t or
in t o en gin e wh ile h oldin g cen t er lin e of ba se slot in 1
o'clock posit ion (F ig. 31). Con t in u e t o en ga ge dist r ib-
u t or in t o en gin e. Th e r ot or a n d dist r ibu t or will r ot a t e
clockwise du r in g in st a lla t ion . Th is is du e t o t h e h eli-
ca l cu t gea r s on dist r ibu t or a n d ca m sh a ft . Wh en dis-
t r ibu t or is fu lly sea t ed t o en gin e block, t h e cen t er lin e
of ba se slot sh ou ld be a lign ed t o cla m p bolt m ou n t in g
h ole on en gin e (F ig. 33). Th e r ot or sh ou ld a lso be
poin t ed a t 5 o'clock posit ion .
It m a y be n ecessa r y t o r ot a t e r ot or a n d dist r ibu t or
sh a ft (ver y sligh t ly) t o en ga ge dist r ibu t or sh a ft wit h
slot in oil pu m p gea r. Th e sa m e m a y h a ve t o be don e
t o en ga ge dist r ibu t or gea r wit h ca m sh a ft gea r.
Th e d is tribu to r is c o rre c tly in s ta lle d w h e n :
• r ot or is poin t ed a t 3 o'clock posit ion (2.5L
en gin e), or a t 5 o'clock posit ion (4.0L en gin e).
• pla st ic a lign m en t pin (or pin pu n ch t ool) is st ill
in st a lled t o dist r ibu t or.
• n u m ber 1 cylin der pist on is set a t t op dea d cen -
t er (TDC) (com pr ession st r oke).
• cen t er lin e of slot a t ba se of dist r ibu t or is a lign ed
t o cen t er lin e of dist r ibu t or h olddown bolt h ole on
en gin e. In t h is posit ion , t h e h olddown bolt sh ou ld
ea sily pa ss t h r ou gh slot a n d in t o en gin e.
No a dju st m en t s a r e n ecessa r y. P r oceed t o n ext
st ep.
IGNITION SYSTEM 8D - 13