Chevrolet 30 Series 1967 Service Manual page 308

ENGINE 6-28
REAR SEAL
FRONT SEAL
Fig. 2 V — Intake M anifo ld G asket and Seal Location
Rocker Arm Cover
Removal
1. Remove air cleaner.
2. On 366 cu. in. engines, disconnect crankcase ventila­
tion hoses at rocker arm cover.
3. Disconnect temperature wire from left rocker arm
clips.
4. On vehicles so equipped, remove carburetor heater
from left exhaust manifold.
5. Remove rocker arm cover.
CAUTION: Do Not pry rocker arm cover loose.
Gaskets adhearing to cylinder head and rocker
arm cover may be sheared by bumping end of
rocker arm cover rearward with palm of hand
or a rubber mallet.
Installation
1. Clean gasket surfaces on cylinder head and rocker
arm cover with degreaser then, using a new gasket,
install rocker arm cover and torque to specifications.
2. Install carburetor heater (if removed).
3. Connect temperature wire at clips on left rocker
arm cover.
4. Connect crankcase ventilation hoses (as required).
5. Install air cleaner, start engine and check for leaks.
Valve Mechanism
Removal
1. Remove rocker arm covers as outlined.
2. Remove rocker arm nuts, rocker arm balls, rocker
arms and push rods.
NOTE:
Place rocker arms, rocker arm balls
and push rods in a rack so they may be re ­
installed in the same locations.
3V—
Fig. V a lv e Adjustment
Installation and Adjustment
NOTE: Whenever new rocker arms and/or
rocker arm balls are being installed, coat bear­
ing surfaces of rocker arms and rocker arm
balls with Molykote or its equivalent.
1. Install push rods. Be sure push rods seat in lifter
socket.
2. Install rocker arm s, rocker arm balls and rocker
arm nuts. Tighten rocker arm nuts until all lash is
eliminated.
3. Adjust valves when lifter is on base circle of cam­
shaft lobe as follows:
a. Crank engine until mark on torsional damper
lines up with center or "O" mark on the timing
tab fastened to the crankcase front cover and the
engine is in the number 1 firing position. This
may be determined by placing fingers on the
number valve as the mark on the damper comes
1
near the " O" mark on the crankcase front cover.
If the valves are not moving, the engine is in the
number 1 firing position. If the valves move as
the mark comes up to the timing tab, the engine
is in number
6
turned over one more time to reach the number
position.
1
b. With the engine in the number 1 firing position
as determined above, the following valves may be
adjusted.
Exhaust - 1, 3, 4,
Intake
c. Back out adjusting nut until lash is felt at the
push rod then turn in adjusting nut until all lash
is removed. This can be determined by checking
firing position and should be
8
- 1, 2, 5, 7
CHEVROLET TRUCK SERVICE M ANUAL