Jeep 1987 Wrangler Workshop Manual page 344

ENGINES
4.2 LITER (258 CID) SIX-CYLINDER ENGINE
Six-Cylinder Engine Specifications (Continued)
(USA)
I n c h e s
Unless
O t h e r w i s e
8 p « € f f t e i f
Cylinder Block (cont'd.)
Cylinder Bore Diameter
(standard) 3.7501-3.7533
Maximum Taper 0.001
Maximum Out-of-Round .......... 0.001
Tappet Bore Diameter 0.9055-0.9065
Cylinder Block Flatness ............ 0.001/1-0.002/6
(0.008 max)
(METRIC)
Millimeters
U n l e s s
O t h e r w i s e
S p e c i f i e d
95.253-95.334
0.025
0.025
23.000-23.025
0.03/25-0.05/152
(0.20 max)
Cylinder Heed
Combustion Chamber Volume 64.45-67.45cc
Valve Arrangement EME-IE-E1-EHE
Valve Guide ID (Integral) 0.3735-0.3745 9.487-9.512
Valve Stem-to-Guide Clearance...... 0.001-0.003 0.03-0.08
Intake Valve Seat Angle 30*
Exhaust Valve Seat Angle 44.5°
Valve Seat Width 0.040-0.060 1.02-1.52
Valve Seat Runout 0.0025 0.064
Cylinder Head Flatness 0.001/1-0.002/6 0.03/25-0.05/152
(0.008 max) (0.20 max)
Lubrication S y s t e m
Engine Oil Capacity ...
Normal Operating Pressure.
Oil Pressure Relief —
Gear-to-Body Clearance (Radial) ,
Gear End Clearance, Plastigage..
Gear End Clearance,
Feeler Gauge —
4 quarts
(Add 1 quart with
filter change)
13
psi
at
§00
rpm,
37-75 pel
(max) at
16©$+ rpm
75 pal (max)
0.002-0.004
(.002
preferred)
0.002-0.006
(0.002
preferred)
0.004-0.008
(0.007
3.8 liters
(Add 0.9
liter with filter
change)
89.6 kPa at
600 rpm,
255.1-517.1
kPa (max) at
1600+ rpm
517.1 kPa (max)
0.051-0.102
(.051
preferred)
0.051-0.152
(0.051
preferred)
0.1016-0.2032
(0.1778
preferred)
Weight (less pin) 510-514 grams
Piston Pin Bore eenterllne-
to-Plston Top 1.651-1.655 41.94-42.04
Piston-to-Bore Clearance 0.0009-0.0017 0.023-0.043
(0.0012-0.0013 (0.030-0.033
preferred) preferred)
P M o n Ring Gap O M r a i m -
Compression (both) 0.010-0.020 0.25-0.51
Piston Ring Gap Clearance -
Oil Control Steel Ralls 0.010-0.025 0.25-0.64
(USA)
Inches
Unless
O t h e r w i s e
Specified
Piston Ring Side Clearance
No. 1 Compression 0.0017-0.0032
(0.0017
preferred)
No. 2 Compression 0.0017-0.0032
(0.0017
preferred)
Oil Control 0.001-0.008
(0.003
preferred)
Piston Ring Groove Height
Compression (both) 0.0795-0.0805
Oil Control 0.188-0.1895
Pistong Ring Groove Diameter
No. 1 and No. 2 3.324-3.329
Oil Control 3.329-3.339
Piston Pin Bore Diameter 0.9308-0.9313
Piston Pin Diameter 0.9304-0.9309
Piston-to-Pin Clearance 0.0003-0.0005
loose
(0.0005
preferred)
Piston-to-Pin Connecting Rod 2000 Ibf
press-fit
(METRIC)
Millimeters
Unless
Otherwise
Specified
0.043-0.081
(0.043
preferred)
0.043-0.081
(0.043
preferred)
0.03-0.20
(0.08
preferred)
2.019-2.045
4.78-4.80
84.43-84.56
84.56-84.81
23.642-23.655
23.632-23.645
0.008-0.013
loose
(0.013
preferred)
8.9kN
press-fit
Rocker Arms, Push Rods and Tappets
Rocker Arm Ratio ......... ..... 1.6:1
Push Rod Length 9.640-9.660 244.856-245.364
Push Rod Diameter 0.312-0.315 7.92-8.00
Hydraulic Tappet Diameter 0.904-0.9045 22.962-22.974
Tappet-to-Bore Clearance 0.001-0.0025 0.03-0.05
Valves
Valve Length
(TIp-to-Gsuge Dim. Line) 4.7895-4.8045
Valve Stem Diameter 0.3715-0.3725
Stem-to-Guide Clearance 0.001-0.003
Intake Valve Head Diameter 1.782-1.792
Intake Valve Face Angle
Exhaust Valve Head Diameter 1.401-1.411
Exhaust Valve Face Angle
Maximum Allowable Removed
for Tip Refinishing 0.010
Valve Springs
Free Length 1.99 approx.
Spring Tension
Valve Closed 64.72 Ibf
at 1.786
Valve Open 188-202 Ibf
at 1.411
Inside Diameter 0.948-0.968
29°
121.653-122.034
9.436-9.462
0.03-0.08
45.26-45.52
35.59-35.84
0.25
50.55 approx.
285-320N
at 45.4
836-898N
at 35.84
24.08-24.59
86219
B-110