Timing Case Cover (8-Cylinder) - Jeep 1979 CJ-5 Technical & Service Manual

ENGINES 1B-47
3
(1) Swing weighted arm of tester away from ram of
tester.
(2) Place 0.312 to 0.313 (7.92 mm to 7.95 mm) diame-
ter ball bearing on plunger cap of tappet.
(3)' Lift ram and place tappet with ball bearing in-
side tester cup.
(4) Lower ram, then adjust nose of ram until it
contacts ball bearing.
(5) Fill tester cup with valve tappet test oil J-5268
until tappet is completely covered.
(6) Swing weighted arm onto ram and pump up and
down on tappet to remove air. When air bubbles: cease,
swing weighted arm away and allow plunger to rise to
normal position.
(7) Adjust nose of ram to align pointer with SET
mark on scale of tester and tighten hex nut.
(8) Slowly swing weighted arm onto ram. Rotate
cup by turning handle at base of tester clockwise one
revolution every two seconds.
(9) Time leak-down from instant pointer aligns
with START mark on scale until pointer aligns with
0.125 mark.
(10) Acceptable tappet will take 20 to 110 seconds to
leak down. Replace tappets outside this range.
N O T E : Do not charge the tappet assemblies with en-
gine oil as they will charge themselves within three to
eight minutes of engine operation.
Installation
(1) Dip each tappet assembly in Jeep Engine Oil
Supplement (EOS), or equivalent. Install tappet in same
bore from which it was removed.
(2) Install push rods in same order as removed.
(3) Install rocker arm and bridged pivot assemblies.
At each bridged pivot, tighten capscrews alternately,
one turn at a time, to avoid damaging bridge. Tighten to
19 foot-pounds (26 N»m) torque.
(4) Pour remaining EOS over entire valve train
mechanism.
N O T E : Do not drain the EOS from the engine for at
least 1,000 miles (1 609 km) or until the next scheduled
oil change.
(5) Reseal and install cylinder head cover. Tighten
retaining screws to 50 inch-pounds (6 N»m) torque.
(6) Install intake manifold using replacement gas-
ket and end seals. Tighten manifold retaining screws to
43 foot-pounds (58 N*m) torque.
(7) Install all lines, hoses, linkage and wires dis-
connected from intake manifold.
Timing Case Cover
The timing case cover is die-cast aluminum with a
crankshaft oil seal to prevent oil leakage at the vibration
damper hub (fig. 1B-75). The oil seal may be installed
from either side of the timing case cover. It is not neces-
sary to remove the cover whenever oil seal replacement
is required.
A graduated scale cast in the cover is used for ignition
timing. A hole is provided for checking ignition timing
with a magnetic timing probe.
The engine oil pump, oil passages and coolant pas-
sages are incorporated within the timing case cover cas-
ting. The timing case cover casting is used to mount the
fuel pump, distributor and water pump.
T I M I N G CASE
COVER GASKET
T I M I N G CASE
COVER O I L SEAL
4 1 9 3 3
Fig. 1 1 - 7 5 Timing Case Cover Assembly
Removal
(1) Drain cooling system and cylinder block.
(2) Disconnect radiator hoses and bypass hose.
(3) Remove all drive belts.
(4) Remove fan and hub assembly.
(5) If equipped with air conditioning, remove com-
pressor and bracket assembly from engine and move
aside. Do not disconnect air conditioning hoses.
(6) Remove a l t e r n a t o r , a l t e r n a t o r m o u n t i n g
bracket and back idler pulley.
(7) Disconnect heater hose at water pump.
(8) Remove power steering pump and bracket as-
sembly, if equipped. Remove air pump and mounting
bracket as assembly. Do not disconnect power steering
hoses.
(9) Remove distributor cap. Note rotor and housing
position.
(10) Remove distributor.
(11) Remove fuel pump.
(12) Remove vibration damper pulley and retaining
screws.
(13) Remove vibration damper using tool J-21791.
(14) Remove two front oil pan screws.
(15) Remove screws which secure timing case cover
to engine block.