Valve Train (8-Cylinder); Rocker Arm Assembly (8-Cylinder); Valves (8-Cylinder) - Jeep 1979 CJ-5 Technical & Service Manual

1B-40 ENGINES
(13) Install Cruise Command vacuum servo bellows
and mounting bracket, if removed.
(14) Connect all wires, lines, linkage and hoses to
engine.
(15) Install air conditioning condenser and receiver
assembly, if removed.
(16) Connect receiver outlet to disconnect coupling.
Connect condenser and evaporator lines to compressor.
(17) Purge compressor of air.
CAUTION: Both service valves must be open before
the air conditioning system is operated.
(18) If equipped with power steering, connect hoses
and fill pump reservoir to specified level.
(19) Install radiator fan and tighten retaining screws
to 18 foot-pounds (24 N*m) torque.
(20) Install radiator and connect upper and lower
hoses. If equipped with automatic transmission, connect
cooler lines.
(21) Fill cooling system to specified level.
(22) Install air cleaner assembly.
(23) Start engine. Check all connections for leaks.
Stop engine.
(24) If removed, install and align hood assembly.
(25) If removed, install transmission access cover,
floormat and transfer case shift lever boot.
VALVE THIN
Genril
All eight-cylinder engines have overhead valves oper-
ated by push rods and rocker arms. A chain-driven cam-
shaft is mounted in the cylinder block. Hydraulic valve
tappets provide automatic valve lash adjustment.
Rocker Arm Assembly
The intake and exhaust rocker arms of each cylinder
pivot on a bridged pivot assembly which is secured to the
cylinder head by two capscrews as shown in figure 1B-
63. The bridged pivot maintains correct rocker arm-to-
valve tip alignment. Each rocker arm is actuated by a
hollow steel push rod with a hardened steel ball at each
end. The hollow push rods channel oil to the rocker arm
assemblies.
Removal
(1) Remove cylinder head cover.
(2) Remove two capscrews at each bridged pivot.
Alternately loosen capscrews one turn at a time to avoid
damaging bridge.
(3) Remove bridged pivots and corresponding pairs
of rocker arms and place on bench in same order as
removed.
(4) Remove rocker arms and place on bench in same
order as removed.
(5) Remove push rods and place on bench in same
order as removed.
Fig. 1B-63 Rocker Arm Assembly
Cleaning and Inspection
Clean all parts with a good cleaning solvent. Use com-
pressed air to clean out the oil passages in the rocker
arms and push rods.
Inspect the pivot surface of each rocker and pivot
assembly. Replace parts which are scuffed, pitted or
excessively worn. Inspect the valve stem contact surface
of each rocker arm and replace if deeply pitted. Inspect
each push rod end for scuffing or excessive wear. If any
push rod is excessively worn from lack of oil, replace
the push rod as well as the corresponding hydraulic
valve tappet and rocker arm.
It is not normal to find a pattern along the length of
the push rod. Check the cylinder head for obstruction if
this condition exists.
Installation
(1) Install push rods. Be sure bottom end of each
rod is centered in plunger cap of hydraulic valve
tappet.
(2) Install bridged pivot and pair of rocker arms to
cylinder from which they were removed.
(3) Loosely install two capscrews to 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) Reseal and install cylinder head cover.
(5) Install retaining screws and washers. Tighten
screws to 50 inch-pounds (6 N»m) torque.
Vilves
The following procedures apply only after the cylinder
head has been removed from the engine. If head has not
been removed, refer to Cylinder Head for removal
procedures.