Rocker Arm Assembly; Valves Removal, Cleaning And Inspection; Valve Refacing; Valve Seat Refacing - Jeep 1979 CJ-5 Technical & Service Manual

ENGINES 1B-5
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Reclir A n Asseiif'
The intake and exhaust rocker arms of each cylinder
pivot on a bridged pivot which is secured with two cap-
screws as shown in figure 1B-7. The bridged pivot main-
tains 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.
jj ROCKER A R M B R I D G E D
J CAPSCREW PIVOT
Fig. 1B-7 Rocker Arm Assembly
Removal
(1) Remove cylinder head cover and gasket.
(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 push rods and place on bench in same
order as removed.
Cleaning and Inspection
Clean all parts with a cleaning solvent and use com-
pressed air to blow out oil passages in the rocker arms
and push rods.
Inspect the pivot surface of each rocker arm and
bridged pivot. Replace any parts which are scuffed, pit-
ted or excessively worn. Inspect valve stem tip contact
surface of each rocker arm and replace any rocker arm
which is deeply pitted. Inspect each push rod end for
excessive wear and replace as required. If any push rod
is excessively worn due to lack of oil, replace the push
rod and inspect the corresponding lifter.
It is not normal to find a wear pattern along the
length of the push rod. Check the cylinder head for
obstruction if this condition exists.
Installation
(1) Install each push rod in location from which it
was removed. Make certain bottom end of each rod is
centered in plunger cap of hydraulic valve lifter.
(2) Install bridged pivots and pair of rocker arms to
cylinders from which they were removed.
(3) Loosely install capscrews to each bridged pivot.
(4) At each bridged pivot, tighten capscrews alter-
nately, one turn at a time time, to avoid damaging
bridge. Tighten to 19 foot-pounds (26 N®m) torque.
(5) Install cylinder head cover and gasket.
Valvis
NOTE: The following procedures apply only after the
cylinder head has been removed from the engine. Refer
to Cylinder Head for removal procedures.
Removal
(1) Compress each valve spring with Spring Com-
pressor Tool J-21931-01 and remove valve locks, retain-
ers, springs and valve stem oil deflectors.
(2) Remove valves and place in rack in same order
as removed from cylinder head.
Cleaning and inspection
(1) Clean all carbon buildup from combustion
chambers, valve ports, valve stems and head.
(2) Clean all dirt and gasket cement from cylinder
head machined surface.
(3) Inspect for cracks in combustion chambers and
valve ports.
(4) Inspect for cracks in gasket surface at each cool-
ant passage.
(5) Inspect valves for burned, cracked or warped
heads. Inspect for scuffed or bent valve stems. Replace
valves displaying any of the above damage.
Valve Refacing
Use a valve refacing machine to reface intake and
exhaust valves to the specified angle. After refacing, at
least 1/32-inch (0.787 mm) margin must remain. If not,
replace the valve. Examples of correct and incorrect
valve refacing are shown in figure 1B-8.
The valve stem tip can be resurfaced and rechamfered
when worn. Do not remove more than 0.020 inch (0.508
mm).
Valve Seat Refacing
Install a pilot of the correct size in the valve guide and
reface the valve seat to the specified angle with a good
dressing stone. Remove only enough metal to provide a
smooth finish