Jeep Wrangler 1997 Manual page 712

9 - 50 2.5L ENGINE
SPECIFICATIONS
2 .5L ENGINE SPECIFICATIONS
Camshaft
Hydraulic Tappet Clearance . . . . . . . . . . . . Zero Lash
Bearing Clearance . . . . . . . . . . . . . 0 .025 to 0.076 mm
(0 .001 to 0 .003 in .)
Bearing Journal Diameter
No . 1 . . . . . . . . 51 .54 to 51 .56 mm (2 .029 to 2 .030 in .)
No . 2 . . . . . . . . 51 .28 to 51 .31 mm (2 .019 to 2 .020 in .)
No . 3 . . . . . . . . 51 .03 to 51 .05 mm (2 .009 to 2 .010 in.)
No . 4 . . . . . . . . 50 .78 to 50 .80 mm (1 .999 to 2 .000 in .)
Base Circle Runout . . . . . . . . . . . . . . 0 .03 mm - max .
(0 .001 in . - max .)
Camshaft Lobe Lift
Exhaust . . . . . . . . . . . . . . . . . . . 6 .579 mm (0 .259 in .)
Intake . . . . . . . . . . . . . . . . . . . . 6 .477 mm (0 .255 in .)
Valve Lift
Exhaust . . . . . . . . . . . . . . . . . 10 .528 mm (0 .4145 in .)
Intake . . . . . . . . . . . . . . . . . . . 10 .350 mm (0.4075 in .)
Intake Valve Timing
Opens . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 .4° BTDC
Closes . . . . . . . . . . . . . . . . . . . . . . . . . . -580 .58° ABDC
Exhaust Valve Timing
Opens . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.8 BBDC
Closes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26.2° ATDC
Valve Overlap . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 .6°
Intake Duration . . . . . . . . . . . . . . . . . . . . . . . . 253 .3°
Exhaust Duration . . . . . . . . . . . . . . . . . . . . . . . . 259 .°
Crankshaft
End Play . . . 0.038 to 0 .165 mm (0 .0015 to 0.0065 in .)
Main Bearing Journal
Diameter . . . . . . . . . . . . . . . . 63 .489 to 63.502 mm
(2 .4996 to 2 .5001 in.)
Main Bearing Journal Width
No. 1 . . . . . . 27 .58 to 27 .89 mm (1 .086 to 1 .098 in .)
Main Bearing Journal Width
No. 2 . . . . . . 32 .28 to 32 .33 mm (1 .271 to 1 .273 in .)
Main Bearing Journal Width
No. 3-4-5 . . . 30 .02 to 30 .18 mm (1 .182 to 1 .188 in .)
Main Bearing Clearance . . . . . . . . . . 0 .03 to 0 .06 mm
(0 .001 to 0 .0025 in .)
Main Bearing Clearance (Preferred) . . . . . . 0.051 mm
(0 .002 in .)
Connecting Rod Journal
Diameter . . . . . . . . . . . . . . . . . . 53 .17 to 53 .23 mm
(2 .0934 to 2 .0955 in .)
Connecting Rod Journal Width . . . 27 .18 to 27 .33 mm
(1 .070 to 1.076 in .)
Out-of-Round (Max. All Journals) . . . . . . . . 0.013 mm
(0 .0005 in .)
Taper (Max . -All Journals) . . . 0 .013 mm (0 .0005 in .)
Cylinder Block
Deck Height . . . . . . . . . . . . . . . 236 .73 mm (9.320 in .)
TJ
Deck Clearance . . . . . . . . . . . . . 0.000 mm (0 .000 in .)
Cylinder Bore Diameter-
Standard .98 .45 to 98.48 mm (3.8759 to 3 .8775 in.)
Cylinder Bore Diameter- Taper
(Max.) . . . . . . . . . . . . . . . . . . 0.025 mm (0 .001 in .)
Cylinder Bore Diameter- Out-of-Round
(Max.) . . . . . . . . . . . . . . . . . . 0.025 mm (0 .001 in .)
Tappet Bore Diameter . . . . . . . . 23.000 to 23 .025 mm
(0.9055 to 0 .9065 in .)
Flatness . . . . 0 .03 mm per 25 mm (0 .001 in . per 1 in .)
Flatness . . . 0 .05 mm per 152 mm (0 .002 in . per 6 in .)
Flatness Max . . . . . . . . . . . . 0 .20 mm for total length
(0 .008 in . for total length)
Main Bearing Bore
Diameter . . . . . . . . . . . . . . 68 .3514 to 68 .3768 mm
(2 .691 to 2 .692 in .)
Connecting Rods
Total Weight (Less Bearing) . . . . . . 657 to 665 grams
(23 .17 to 23 .45 oz .)
Length (Center-to-Center) . . . . . 155 .52 to 155 .62 mm
(6 .123 to 6 .127 in .)
Piston Pin Bore Diameter . . . . . . . 23 .59 to 23 .62 mm
(0.9288 to 0 .9298 in.)
Bore (Less Bearings) . . . . . . . . . . . 56 .08 to 56 .09 mm
(2.2080 to 2 .2085 in .)
Bearing Clearance . . . . . . . . . . . . . 0 .025 to 0.076 mm
(0 .001 to 0 .003 in .)
Bearing Clearance (Preferred) . . . . 0 .044 to 0.050 mm
(0.0015 to 0 .0020 in .)
Side Clearance . .0 .25 to 0 .48 mm (0 .010 to 0 .019 in .)
Twist (Max.) . .0 .001 mm per mm (0 .001 in . per inch)
Bend Max .) . .0 .001 mm per mm (0 .001 in . per inch .)
Cylinder Compression Pressure
Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 .1 :1
Pressure Range . . . . 827 to 1,034 kPa (120 to 150 psi)
Max . Variation Between Cylinders . .206 kPa (30 psi)
Cylinder Head
Combustion Chamber . . . . . . . . . . . . . 49 .9 to 52 .9 cc
(3 .04 to 3 .23 cu . in .)
Valve Guide I .D . (Integral) . . . . . . . . 7 .95 to 7 .97 mm
(0 .313 to 0 .314 in .)
Valve Stem-to-Guide Clearance . . . 0 .025 to 0 .076 mm
(0 .001 to 0 .003 in .)
Intake Valve Seat Angle . . . . . . . . . . . . . . . . . . . 44 .5°
Exhaust Valve Seat Angle . . . . . . . . . . . . . . . . . 44 .5°
Valve Seat Width . . . . . . . . . . . . . . . 1 .01 to 1 .52 mm
(0 .040 to 0 .060 in .)
Valve Seat Runout . . . . . . . . . . 0 .064 mm (0 .0025 in .)
Flatness . . . . . . . . . . . . . . . . . . . 0.03 mm per 25 mm
(0 .001 in . per 1 in .)
Flatness . . . 0 .05 mm per 152 mm (0 .002 in . per 6 in .)