Jeep UNIVERSAL CJ-2A - Page 86

'Jeep' UNIVERSAL and 'Jeep' DISPATCHER
E
Fig. 100). This gasket position allows a positive
seal along the narrow surfaces of the cylinder head
between the combustion chambers and eliminates
the possibility of burning combustion gases reach-
ing an asbestos portion of the cylinder head gasket.
Install the cylinder head bolts. Tighten the bolts
10102
FIG. 109-CYLINDER HEAD BOLT
TIGHTENING SEQUENCE
with a• torque wrench to 6Q, to 70 lb-ft. [8,3 a 9,7
kg-m.].in the sequence shown in Fig. 109. Do not
overlook installing the cylinder head bolt in the
intake manifold directly under the carburetor
opening.
E-100. Install Rocker Arm Assembly
a. Insert ball ends of the intake valve push rods
through the cylinder head and cylinder block and
seat them in the cupped head of the intake valve
tappets.
b. Install the rocker-arm assembly on the four
rocker-arm-mounting studs. Align the rocker arms
so that the ball ends of the intake valve' tappet
adjusting screws fit into the cup ends of the push
rods.
c. Install the four rocker-arm-attaching nuts.
Thread each nut down evenly in sequence, one
turn at a time, until the torque is 30 to 36 lb-ft.
[4,1 a 5,0 kg-m.].
E-101. Install Spark Plugs
Clean and adjust the spark plugs, setting the
electrode gaps at .030" [0,762 mm.]. Install the
plugs to prevent any foreign matter entering the
combustion chambers during the remaining opera-
tions. Torque the spark plugs 25 to 33 lb-ft.
[3,4 a 4,6 kg-m.].
E-102. Install Manifold
...
If manifold studs were removed for replacement,
apply sealer on the stud threads before installing
a new stud.
Make certain that no foreign objects are inside the
manifold and that all passages are clear. Place a
ne'f set of manifold gaskets in position on the side
of the cylinder Qlock. Then, carefully slide the
manifold onto· the studs and against the cylinder
block being careful not to damage the gaskets.
Torque all manifold attaching nuts evenly 29 to
35 lb-ft. (4,0 a 4,8 kg-m.].
E-103. Install Oil Filler Tube
When installing the oil filler tube, be sure that the
beveled. lower end is away from the crankshaft.
Place a piece of hard wood over the top of the tube
to prevent damage to the cap gasket seat.
E-104. Install Water Pump
Make certain that the mating silrfaces of the water
pump and the cylinder block are clean and smooth.
Install the gasket on the flange of the pump and
install the pump in position on the cylinder block.
Torque the water pump attaching bolts alternately
and evenly 12 to 17 lb-ft. [1,7 a 2,3 kg-m.].
E-105. Install Water Outlet Fitting
Install the thermostat and the water outlet fitting.
Torque the water outlet fitting attaching bolts 20
to 25 lb-ft. [2,8 a 3,4 kg-m.].
E-106. Final Operations
Before starting the engine, adjust the exhaust
valve tappets to .016" [0,4064 mm.]. Set the intake
valve rocker arm adjustments close to the standard
.018" [0,4572 mm.] adjustment.
Start the engine and let it warm up to normal
operating temperature. Then retorque all heaJ
bolts in the proper sequence.
Note: It is advisable to check the tightness of
the head bolts again after 500 to 600 miles [800 a
960 km.] of normal operation.
Check all head bolts and the head gasket for leaks.
Cement a new gasket on the rocker arm cover~
Install the cover placing an oil seal then a flat
washer and nut on each cover stud. Cement a new
gasket on the exhaust valve cover. Install the
cover and crankcase ventilation fittings using a
new gasket back of the vent cover and new copper
ring gaskets under the attaching screw heads.
Torque the valve tappet cover nuts 7 to 10 lb-ft.
[1,0 a 1,4 kg-m.].
E-106A. Compression Test
Take compression readings with a compression
gauge,
as shown in Fig. 22 at each cylinder while
cranking the engine with the starter motor. Allow
only four compression strokes at each cylinder and
record only the first and fourth readings. Interpret
the readings as follows:
a. When pressure quickly comes up to specified
pressure and is uniform between all cylinders with-
in 10 psi. [0,7 kg-cm2) it indicates that the engine is
operating normally with satisfactory seating of
rings, valves, valve timing, etc.
b. When pressure is low on the first stroke and
builds up to less than specified pressure it indicates -
compression leakage usually attributable to rings or
valves. To determine which is responsible, pour ~
oz. [15 cm3) of tune-up oil into each cylinder. Allow
a few
minutes for the oil to leak down past the rings.
Then again test compression. If compression
pressures improve over the first test, the trouble is
probably worn piston rings and bores. If com-
pression
pressures do not improve, the trouble is
probably caused by improper valve seating. If this
condition ill noticed on only two cylinders that are
adjacent, there is a possible gasket leak between
these cylinders. If inspection of the spark plugs
from th~se cylinders dislcosed fouling of surface
cracking of eles:trodes, gasket leakage is probable.
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