Jeep Cherokee 1999 Electronic Service Manual page 1111

9 - 94 4.0L ENGINE
SPECI FI CAT I ON S (Cont inue d)
Twist (Ma x.) . . . . . . . . . . . . . . . 0.001 m m per m m
Ben d (Ma x.) . . . . . . . . . . . . . . . 0.001 m m per m m
Cy lin d e r Co m p re s s io n P re s s u re
Ra t io . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.8:1
P r essu r e Ra n ge . . . . . . . . . . . . . 827 t o 1,034 kP a
Ma x. Va r ia t ion Bet ween Cylin der s . . . . . 206 kP a
Cy lin d e r He a d
Com bu st ion Ch a m ber . . . . . . . . . 52.22 t o 58.22 cc
Va lve Gu ide I.D. (In t egr a l) . . . . . 7.95 t o 7.97 m m
Va lve St em -t o-Gu ide
Clea r a n ce . 0.025 t o 0.076 m m (0.001 t o 0.003 in .)
In t a ke Va lve Sea t An gle . . . . . . . . . . . . . . . . 44.5°
E xh a u st Va lve Sea t An gle . . . . . . . . . . . . . . 44.5°
Va lve Sea t Widt h . . . . . . . . . . . . . 1.02 t o 1.52 m m
Va lve Sea t Ru n ou t . . . . . . . 0.064 m m (0.0025 in .)
F la t n ess . . . . . . . . . . . . . . . . 0.03 m m per 25 m m
F la t n ess . . . . . . . . . . . . . . . 0.05 m m per 152 m m
F la t n ess Ma x. . . . 0.20 m m - m a x. for t ot a l len gt h
(0.008 in . m a x. for t ot a l len gt h )
Ro c k e r Arm s , P u s h Ro d s & Ta p p e ts
Rocker Ar m Ra t io . . . . . . . . . . . . . . . . . . . . . 1.6:1
P u sh Rod Len gt h . . . . . . . 244.856 t o 245.364 m m
P u sh Rod Dia m et er . . . . . . . . . . . 7.92 t o 8.00 m m
H ydr a u lic Ta ppet Dia m et er . 22.962 t o 22.974 m m
Ta ppet -t o-Bor e Clea r a n ce . . . . 0.025 t o 0.063 m m
Va lv e s
Len gt h (Tip-t o-Ga u ge Dim en sion Lin e)
In t a ke . . . . . . . . . . . . . . . 122.479 t o 122.860 m m
Len gt h (Tip-t o-Ga u ge Dim en sion Lin e)
E xh a u st . . . . . . . . . . . . . . 122.860 t o 123.241 m m
Va lve St em Dia m et er . . . . . . . . 7.899 t o 7.925 m m
St em -t o-Gu ide Clea r a n ce . . . . . 0.025 t o 0.076 m m
Va lve H ea d Dia m et er —
In t a ke . . 48.387 t o 48.641 m m (1.905 t o 1.915 in .)
Va lve H ea d Dia m et er —
E xh a u st . . . . . . . . . . . . . . . . 37.973 t o 38.227 m m
Va lve F a ce An gle—In t a ke . . . . . . . . . . . . . . . . 45°
(0.001 in . per in ch )
(0.001 in . per in ch .)
(120 t o 150 psi)
(30 psi)
(3.37 t o 3.55 cu . in .)
(0.313 t o 0.314 in .)
(0.040 t o 0.060 in .)
(0.001 in . per 1 in .)
(0.002 in . per 6 in .)
(9.640 t o 9.660 in .)
(0.312 t o 0.315 in .)
(0.904 t o 0.9045 in .)
(0.001 t o 0.0025 in .)
(4.822 t o 4.837 in .)
(4.837 t o 4.852 in .)
(0.311 t o 0.312 in .)
(0.001 t o 0.003 in .)
(1.495 t o 1.505 in .)
Va lve F a ce An gle—E xh a u st . . . . . . . . . . . . . . . 45°
Tip Refin ish in g (Ma x. Allowa ble) . . . . . . 0.25 m m
Va lv e S p rin g s
F r ee Len gt h (Appr ox.) . . . . . 47.65 m m (1.876 in .)
Spr in g Ten sion —
Va lve Closed . . . . . . . 316 t o 351 N @ 41.656 m m
Spr in g Ten sion —
Va lve Open . . . . . . . . 898.6 t o 969.7 N 30.89 m m
In side Dia m et er . . . . . . . . . 21.0 m m t o 21.51 m m
P is to n s
Weigh t (Less P in ) . . . . . . . . . . . 417 t o 429 gr a m s
P ist on P in Bor e (Cen t er lin e t o P ist on
Top) . . . . . 40.61 t o 40.72 m m (1.599 t o 1.603 in .)
P ist on -t o-Bor e Clea r a n ce . . . . . 0.018 t o 0.038 m m
Rin g Ga p Clea r a n ce—Top Com pr ession
Rin g . . . 0.229 t o 0.610 m m (0.0090 t o 0.0240 in .)
Rin g Ga p Clea r a n ce—2n d Com pr ession
Rin g . . . 0.483 t o 0.965 m m (0.0190 t o 0.0380 in .)
Rin g Ga p Clea r a n ce—Oil Con t r ol St eel
Ra ils . . . . . 0.254 t o 1.500 m m (0.010 t o 0.060 in .)
Rin g Side Clea r a n ce—Com pr ession
Rin gs . . 0.042 t o 0.084 m m (0.0017 t o 0.0033 in .)
Rin g Side Clea r a n ce—Oil Con t r ol
Rin gs . . . . 0.06 t o 0.21 m m (0.0024 t o 0.0083 in .)
P ist on Rin g Gr oove H eigh t —Com pr ession
Rin gs . . 1.530 t o 1.555 m m (0.0602 t o 0.0612 in .)
P ist on Rin g Gr oove H eigh t —Oil Con t r ol
Rin g . . . 4.035 t o 4.060 m m (0.1589 t o 0.1598 in .)
P ist on Rin g Gr oove Dia m et er —No.1 Com pr ession
Rin g . . . . . . . 88.39 t o 88.65 m m (3.48 t o 3.49 in .)
P ist on Rin g Gr oove Dia m et er —No.2 Com pr ession
Rin g . . . . . . . 87.63 t o 87.88 m m (3.45 t o 3.46 in .)
P ist on Rin g Gr oove Dia m et er —Oil Con t r ol
Rin g . . . . . . . 89.66 t o 89.92 m m (3.53 t o 3.54 in .)
P ist on P in Bor e Dia m et er . . 23.650 t o 23.658 m m
P ist on P in Dia m et er . . . . . . 23.637 t o 23.640 m m
P ist on -t o-P in Clea r a n ce . . . . 0.0102 t o 0.0208 m m
P ist on -t o-P in Con n ect in g Rod
(P r ess F it ) . . . . . . . . . . . . . . . . . 8.9 kN (2000 lbf.)
Oil P u m p
Gea r-t o-Body Clea r a n ce
(Ra dia l) . . . 0.051 t o 0.102 m m (0.002 t o 0.004 in .)
Gea r-t o-Body Clea r a n ce (Ra dia l)
(P r efer r ed) . . . . . . . . . . . . . . 0.051 m m (0.002 in .)
Gea r E n d Clea r a n ce—
P la st iga ge . 0.051 t o 0.152 m m (0.002 t o 0.006 in .)
(0.010 in .)
(71 t o 79 lbf. @ 1.64 in .)
(202 t o 218 lbf @ 1.216 in .)
(0.827 t o 0.847 in .)
(14.7 t o 15.1 oz.)
(0.0008 t o 0.0015 in .)
(0.9312 t o 0.9315 in .)
(0.9306 t o 0.9307 in .)
(0.0005 t o 0.0009 in .)
X J