Jeep UNIVERSAL CJ-2A - Page 49

D
L4-134 ENGINE
closely wound coils of each spring are at the top
(placed up to seat against the block). See Fig. 62.
FlG. 62-VALVE TAPPETS AND SPRINGS
Turn the crankshaft as necessary to bring each
valve tappet to its lowest position. Using a valve
spring compressor, compress each valve spring
while holding the valve down so that the stem ex-
tends through the valve spring retainer far enough
to permit installation of the. valve spring locks.
Heavy lubricating oil or grease plaood on the inside
surface of the valve locks will help to hold the locks
on the valve stem until the valve spring lifter can
be removed. When installation of valves is com-
plete, remove any cloths used to block the valve
compartment floor openings.
Oil the valve stems. Insert all valves in the valve
guides from which they were removed. Adjust the
valve . tappets to the proper specified clearance of
.016" [0,406 mm.] cold. Refer to Par. D-96, D-97,
D-98, and specifications at the end of this section
for specifications and adjustment procedure.
D-82. Install Camshaft Sprocket and Chain
Before installing the camshaft sprocket on engines
with chain driven camshafts turn the crankshaft
so No.1 and 4 pistons are at top center as indicated
by the "TC" mark on the flywheel which can be
seen through the timing hole in the flywheel housing
on the right side of the engine, Fig. 67 and Fig; 68.
Place the camshaft sprocket on the shaft and tum
the shaft until the punch mark on the rim of the
sprocket faces the punch mark on the crankshaft
sprocket.
Remove the camshaft sprocket and place the timing
chain in position over the crankshaft sprocket. Posi-
tion the camshaft sprocket within the chain and
change the position until the screw holes in the
sprocket and camshaft match.
Timing is correct when a line drawn through the
sprocket centers cuts through the timing marks on
both sprockets. See Fig. 63. In this position No. 4
piston is at top of compression stroke and the dis-
tributor rotor arm should be ·under the distributor
cap segment for that cylinder.
48
FIG. 63-TIMING SPROCKETS
D-83. Install Camshaft Timing Gear
Turn the camshaft or crankshaft as necessary so
that the timing marks on the two gears will be
together after the camshaft timing gear is installed.
Refer to Fig. 66. Install the woodruff key in the
keyway on the front end of the camshaft. Start the
large timing gear on the camshaft with the wide
hub of the gear facing out. Do not drive on the
camshaft gear, or the camshaft may dislodge the
plug at the rear of the cylinder block causing an
oil leak. Install the camshaft gear retaining screw
and torque it 30 to 40 lb-ft. [4,1 a 5,5 kg-m.] draw-
ing the gear onto the camshaft in the process.
Standard running tolerance between the timing
gears is .000" to .002
11
[0 a 0,051 mm.] which should
be checked with a dial indicator.
FIG. 64-TIMING GEARS