Jeep Cherokee 1999 Electronic Service Manual page 1078

X J
SERV I CE PROCEDU RES (Cont inue d)
Rin g Ga p Me a s u re m e n t
Top Com pr ession Rin g . . . . . . . . 0.229 t o 0.610 m m
Secon d Com pr ession Rin g . . . . . . 0.483 t o 0.965 m m
Oil Con t r ol Rin g . . . . . . . . . . . . . 0.254 t o 1.500 m m
(5) Th e oil con t r ol r in gs a r e sym m et r ica l, a n d ca n
be in st a lled wit h eit h er side u p. It is n ot n ecessa r y t o
u se a t ool t o in st a ll t h e u pper a n d lower r a ils. In ser t
oil r a il spa cer fir st , t h en side r a ils.
(6) Th e t wo com pr ession r in gs a r e differ en t a n d
ca n n ot be in t er ch a n ged. Th e t op com pr ession r in g
ca n be iden t ified by t h e sh in y coa t in g on t h e ou t er
sea lin g su r fa ce a n d ca n be in st a lled wit h eit h er side
u p (F ig. 8).
(7) Th e secon d com pr ession r in g h a s a sligh t
ch a m fer on t h e bot t om of t h e in side edge a n d a dot
on t h e t op for cor r ect in st a lla t ion (F ig. 9).
(8) Usin g a r in g in st a ller, in st a ll t h e secon d com -
pr ession r in g wit h t h e dot fa cin g u p (F ig. 9) (F ig. 11).
(9) Usin g a r in g in st a ller, in st a ll t h e t op com pr es-
sion r in g (eit h er side u p).
Fig. 8 Top Compression ring identification
Fig. 9 Second Compression Ring Identification
(0.0090 t o 0.0240 in ch )
(0.0190 t o 0.0380 in ch )
(0.010 t o 0.060 in ch )
Fig. 10 Compression Ring Chamfer Location
Fig. 11 Compression Ring Installation
Ring Gap Orientation
• P osit ion t h e ga ps on t h e pist on a s sh own (F ig.
12).
• Oil spa cer - Ga p on cen t er lin e of pist on skir t .
• Oil r a ils - ga p 180° a pa r t on cen t er lin e of pist on
pin bor e.
• No. 2 Com pr ession r in g - Ga p 180° fr om t op oil
r a il ga p.
• No. 1 Com pr ession r in g - Ga p 180° fr om No. 2
com pr ession r in g ga p.
FITTING CONNECTING ROD BEARINGS
INSPECTION
BEARINGS
In spect t h e con n ect in g r od bea r in gs for scor in g a n d
ben t a lign m en t t a bs (F ig. 13) (F ig. 14). Ch eck t h e
bea r in gs for n or m a l wea r pa t t er n s, scor in g, gr oovin g,
fa t igu e a n d pit t in g (F ig. 15). Repla ce a n y bea r in g
t h a t sh ows a bn or m a l wea r.
In spect t h e con n ect in g r od jou r n a ls for sign s of
scor in g, n icks a n d bu r r s.
4.0L ENGINE 9 - 61