Chevrolet 10 Series 1970 Service Manual page 350

ENGINE 6-28
F ig . IV — In ta ke M a n ifo ld G a ske t and Seal Lo ca tio n
Exhaust M an ifo ld
Removal
NOTE: On ve h ic le s equipped with A ir Injection
R eactor System, disconnect
outlined in Section 6T.
stove.
1. On ve h ic le s so equipped, rem ove ca rb u retor heater.
2. On le ft exhaust m anifold, disconnect and rem ove
D elcotron.
3. On "M a r k IV V 8"
4. Disconnect exhaust
exhaust pipe from fra m e with w ire.
5. R em ove end bolts then rem ove center bolts and
rem ove manifold.
Installation
1. Clean mating su rfaces on m anifold and head, then
install m anifold in
(fin ge r-tigh t).
2. Torque m anifold bolts to specifications.
3. Connect exhaust pipe to m anifold. Use new gasket or
packing.
4. On "M a r k IV V8"
Torque plugs to specification s.
5. On le ft exhaust m anifold, install and connect D e lco ­
tron. Adjust b elt as outlined in Engine Tune Up.
6. On v e h ic le s so equipped, install ca rb u retor heater.
7. Start engine and check fo r leaks.
Rocker Arm Cover
Removal
1. R em ove a ir clean er.
2. D isconnect A ir Injection R ea ctor hose at check valve.
3. Disconnect crankcase
arm c o v e rs .
a ir m anifold as
R em ove a ir p reh eater
engines, rem ove spark plugs.
pipe from m anifold and hang
p o s i t i o n and in stall
engines, install spark plugs.
ven tilation hoses at ro ck er
4. Disconnect tem perature w ire fro m le ft ro ck er arm
clips.
5. On veh icles so equipped, rem ove carb u retor heater
fro m le ft exhaust manifold*
6. R em ove rock er arm c o ver.
CAUTIO N:
Gaskets adhering to cylin d er head and rock er
arm co ve r may be sheared by bumping end o f
ro c k e r arm c o v er rea rw a rd with palm o f hand
or a rubber m allet.
Installation
1. Clean gasket su rfaces on cylin d er head and ro ck er
arm co v er
gasket, install
sp ecifications.
2. Install ca rb u retor heater (if rem oved ).
3. Connect tem perature w ire at clip s on le ft rock er
arm co ver.
4. Connect crankcase ventilation hoses (as requ ired).
5. Connect A ir Injection re a c to r hose.
60 Install a ir clean er, start engine and check fo r leaks.
V a lv e Mechanism
Removal
1. R em ove rock er arm c o vers as outlined.
2. R em ove ro ck er arm nuts, ro ck er arm b alls, rock er
a rm s and push rods.
NOTE: P la ce
and push rods in a rack so they may be r e ­
in stalled in the sam e locations.
Installation and Adjustment
NOTE: W henever
ro ck er arm b alls a re being in stalled, coat b e a r­
ing su rfaces o f rock er a rm s and ro c k e r arm
ba lls with "M o ly k o te " o r its equivalent.
1. Install push rods. Be sure push rods seat in lifte r
socket.
2. Install ro ck er arm s, ro ck er arm b a lls and rock er
arm nuts. Tighten ro ck er arm nuts until a ll lash is
elim inated.
3. Adjust va lv es when lifte r is on base c ir c le o f cam ­
shaft lobe as follow s:
a. Crank
bolts
lin es up with center or " O "
tab fastened to the crankcase front co v e r and the
engine is in the number 1 firin g position. Th is
may be
number 1 va lve as the m ark on the dam per com es
near the " O " m ark on the crankcase fron t co ver.
If the va lv e s a re not m oving, the engine is in the
number 1 firin g position. If the va lv e s m ove as
the m ark com es up to the tim ing tab, the engine
is in number 6 firin g position and should be
turned o v e r one m ore tim e to reach the number
1 position.
b. W ith the engine in the number 1 firin g position
as determ ined above, the follow in g va lv es may be
adjusted.
Do Not p ry ro ck er arm co ve r loose.
with d e g rea s er then,
ro c k e r arm co ve r
ro ck er arm s, ro c k e r arm b a lls
new ro ck er a rm s
engine until m ark on torsion al damper
m ark on the tim ing
determ ined by placing fin g e rs on the
Exhaust - 1, 3, 4, 8
Intake - 1, 2, 5, 7
CHEVROLET TRUCK SERVICE MANUAL
using a new
and torque to
and/or