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ENGINES--6-CYLINDERr
rocker arm shaft. Hardened steel spacers are used
between the pairs of rocker arms. The rocker shaft is
held in place by bolts and stamped steel retainers at-
tached to the seven brackets on the cylinder head.
Removal
(1) Remove the closed vent system.
(2) Remove the cylinder head cover and gasket.
(3) Remove the rocker shaft bolts and retainers.
(4) Remove the rocker arms and shaft assembly.
Installation
(1) The rocker arms and shaft assembly must be
installed, as shown in Figure 10: The flat on the end
of the rocker shaft must be on top and point toward
the front of the engine. This is necessary to provide
proper lubrication to the rocker assemblies.
(2) Install the rocker shaft retainers between the
rocker arms so they seat on the rocker shaft and not
on the extended bushing of the rocker arm.
Be sure to install the long retainer in the center po-
sition only.
(3) Install the rocker shaft bolts. Install the long
bolt at the rear of the engine. Tighten to 25 foot-
pounds torque.
(4) Adjust tappets. Hot; intake
.010
inch, exhaust
.020 inch.
VALVES AND VALVE SPRINGS
Valves are arranged in line in the cylinder head
and operate in guides that are integral with the cyl-
inder heads.
Removal
valve springs, using Tool C-3422A (Fig. 11).
(1) With cylinder head removed, compress the
OL
CYLINDER HEAD ASSEMBLY
/
Fig. 1 1 --Compressing Valve Spring
Uool C-3422A1
-rc
VALVE
Fig. 12-Measuring
Wear with Sleeve
uooi c-39731
(2) Remove the valve retaining locks, valve spring
retainers, valve stem cup seals and the valve springs.
NOTE:
Remove any burrs from the valve stem
lock
grooves to prevent damage to the valve guide when
the valves are removed.
Valve Inspection
(1)
Clean the valves thoroughly and discard
burned, warped and cracked valves.
(2) Measure the valve stems for wear. The intake
valve stem diameter (new valve) should measure .372
to .373 inch and exhaust valve stem diameter (new
valve) should measure .371 to .372 inch. If the wear
exceeds
.002
inch, replace the valve.
(3) Remove carbon and varnish deposits from the
inside of the valve guides, with Tool C-756.
(4) Measure the valve stem guide clearance as fol-
lows:
Fig. 13-Measuring
Valve Guide
(roo1 c-33391
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