Six-Cylinder Engine Specifications - Jeep J-10 Series 1982 Technical & Service Manual

of 40, 70 and 80 foot-pounds torque (54, 95, 108 N«m).
Plastigage all inserts if replacement inserts or crank
shaft have been installed.
(4) Clean cylinder bores thoroughly. Apply light
film of clean engine oil to bores with clean, lint-free
cloth.
(5) Install piston rings on piston. Refer to Piston
Rings for procedure.
(6) Lubricate piston and rings with clean engine oil.
(7) Use Piston Ring Compressor Tool J-5601 to in
stall connecting rod and piston assemblies through top
of cylinder bores (fig. 1B-82).
NOTE: Ensure that connecting rod bolts do not scratch
the connecting rod journals or cylinder walls. Short
lengths of rubber hose slipped over the connecting rod
b<dts will provide protection during installation.
(8) Apply oil to inserts. Install connecting rod bear
ing inserts and caps in same location as removed.
Tighten retaining nuts with 33 foot-pounds (45 N*m)
torque.
NOTE: Oil squirt holes in connecting rods must face
camshaft.
ENGINES 1B-63
(9) Install oil pump with replacement pickup tube
and screen assembly.
(10) Install oil pan using replacement gaskets and
seals. Tighten drain plug.
(11) Install camshaft and timing chain—sprocket
assembly.
(12) Install timing case cover.
(13) Install vibration damper and drive pulley.
(14) Install valve tappets.
(15) Install gasket and cylinder head.
(16) Install push rods.
(17) Install rocker arms and bridge and pivot assem
blies. Loosely install capscrews at each bridge, then
tighten capscrews alternately, one turn at a time, to
avoid damaging or breaking bridge.
(18) Install cylinder head cover, using silicone (RTV)
rubber sealant.
(19) Install intake and exhaust manifolds.
(20) Remove engine from engine stand.
(21) Install engine assembly as outlined within En
gine Installation.
SPECIFICATIONS
Six-Cylinder Engine Specifications
(USA)
(METRIC)
Inches Millimeters
Unless
Unless
Otherwise
Otherwise
Specified
Specified
Type In Line. OHV. Six-cylinder
Bore 3.75 95.25
Stroke 3.895 98.93
Displacement 258 cubic inches 4.2 liter
Compression Ratio 8.6:1
Compression Pressure 120-150 psi 827-1034 kPa
Maximum Variation Between
Cylinders 30 psi 206 kPa
Firing Order 1-5-3-6-2-4
Taxable Horsepower 33.75 Bhp 25.2 kW
Fuel unleaded
Camshaft
Fuel Pump Eccentric Diameter 1.615-1.625 41.02-41.28
Tappet Clearance Zero Lash (Hydraulic tappets)
End Play Zero (engine operating)
Bearing Clearance 0.001-0.003 0.025-0.076
Bearing Journal Diameter
No. 1 2.029-2.030
No. 2 2.019-2.020
No. 3 2.009-2.010
No. 4 1.999-2.000
Base Circle Runout 0.001 (max)
Cam Lobe Lift 0.253
Valve Lift . . . 0.405
Intake Valve Timing
Opens 9° BTDC
Closes 73°ABDC
Exhaust Valve Timing
Opens 57° BBDC
Closes 25° ATDC
Valve Overlap 34°
Intake Duration 262°
Exhaust Duration 262°
51.54-51.56
51.28-51.31
51.03-51.05
50.78-50.80
0.03 (max)
6.43
10.29
Connecting Rods
Total Weight (less bearings)
Total Length (center-to-center). . .
Piston Pin Bore Diameter
Connecting Rod Bore (less bearings)
Bearing Clearance
Side Clearance .
Maximum Twist
Maximum Bend
Crankshaft
End Play
Main Bearing Journal Diameter
Main Bearing Journal Width
No. 1
No. 3
No. 2-4-S-6-7
Main Bearing Clearance . . . .
Connecting Rod Journal Diameter
Connecting Rod Journal Width
Maximum Out-of-Round
(All Journals)
Maximum Taper (All Journals)
Cylinder Block
Deck Height . .
Deck Clearance
(USA)
Inches
Unless
Otherwise
Specified
695-703
5.873-5.877
0.9288-0.9298
2.2085-2.2080
0.001 -0.003
(0.0015-0.002
preferred)
0.010-0.019
0.001 per inch
0.0005
per inch
0.0015-0.0065
2.4996-2.5001
1.086-1.098
1.271-1.273
1.182-1.188
0.001-0.0025
(0.002
preferred)
2.0934-2.0955
1.070-1.076
0.0005
0.0005
(METRIC)
Millimeters
Unless
Otherwise
Specified
grams
149.17-149.28
23.59-23.62
56 09-56.08
0.03-0.08
(0.044.05
preferred)
0.25-0.48
0.025 per
25.4 mm
0.0127 per
25.4 mm
0.038-0.165
63.489-63.502
27.58-27.89
32.28-32.33
30.02-30.18
0.03-0.06
(0.051
preferred)
53.17-53.23
27.18-27.33
0.013
0.013
9.487-9.493
0.0148
(below block)
240.97-241.12
0.376
(below block)
60263A