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20
Chapter
I-
General Engine Repair
Combination Adjusting
Tool
Feeler
Gouge
6210
Fig
. 26-Valve
Lash Ch eck
(b)
FINAL ADJ
USTMENT.
Run the
engine for app roxi-
mately
30 minutes at
1200
r.p.m.
Check the valve
lash
for
conformance to specifications (fig. 27) with
the
engine
idling.
Adjust
the
lash,
if
necessary.
Install
the
va lve
rocker
arm
cover using a
new
gasket,
if
neces-
sary.
Do not
ti ghten
the cover
nu
ts to more than 2.0-2.5
foot-pounds torque, or the
cover wi
ll
be distorted.
(2)
8-CYLINDER
ENGI NES.
(a)
PRELIMINARY
ADJUSTMENT.
R
emove
the valve
rocker
arm covers.
R
otate the crankshaft
until
N
o.
1
piston
is near
T
op
D
ead
Center
( T.D.C.) at
the
end
of
the
compression
stroke.
NOTE
:
No
.1
pis/.o"
is
" ear
T.D.C.
at
'he
e"d
of
tIle
compression
sl.ro
k
e
wil
en both
v
alv
es are
closed
ami
I.h
e
tim
ing
m.ark
on
the crankshaft
pulley
is in
lin
e
w;lh th
e
p
o
inte
r.
Check
the
intake
valve lash
for
conformance
to
specifications.
Fig
.
27-Valve
Lash
Check
NOTE: To
eliminote
th
e
possibility
of
interfe
ren
ce
with
I.he ex
/wu
st
m.anifolds
while
adjustin
g
I.h
e varve
lash
,
bend
th
e
proper
gauge f
eele
r sto
ch:
.
10
a
60
°
angle
about
o
n
e
inch
fr
onl.
th
e e
nd.
L
oosen
the lock
nut,
and
adjust the
screw
to
spe-
cifications.
T
ighten
the lock nut
without
moving
the
screw. Tighten
the nut
to
30-35 foot-pounds torque.
Check
and
adjust
the
exhaust
valve
lash
to
specifica-
tions
in the
same
manner.
R
epeat
the procedure for each set of
va
lves,
turn-
ing
th
e cra nksha
ft V4-turn
whi
le checking
the
va lves
in th
e
fir ing
orde
r
(
1-5-4-8-6-3-7-2
)
.
(b) FINAL
ADJUSTM
ENT.
Run
the
engine
for ap-
proximately 30 m inutes at 1200
r.p.m.
Check
the
va lve
lash
with
the
engine
idling,
as show
n
in fig. 26
or 27.
Adjust
the
lash,
if
necessary.
Install
t he va lve
rocker
arm
cover
using a new gasket,
if
necessary.
Tighten
the cover nuts
to 2.0-2.5 foot-
pounds torque.
D
o not exceed the
t
orque
limit
or the
cover wi
ll
be distorted.
e.
Valve
Timing.
Valve timi ng checks
should
be
m
ade
when poor
engine performa nce
is noted,
and
all
other
checks,
such
as carburetion,
ignition timing,
etc.
fail to correct
the
trouble.
The
following procedure
for checking
va lve
timing
is taken on the
opening side
of
N
o.
1
intake cam
lobe.
At
this
point
a
1
degree
change of
the crankshaft is
approximately equal
to .00
I
-inch
change
in
cam
lift.
R
emove
the
va
lve
rocker
a
rm cover
on
the
6-cylinder
engine.
On a-cylinder
engines,
remove the right
va
lve
rocker arm cover.
Turn
the engi ne
over
until
N
o.
1
intake tappet
is
on
the
heel
of
N
o.
1
intake
cam lobe.
(If the
No.
1
valve
is
operating
rotate the crankshaft one
turn)
.
BE SURE
TO
PlACE
IN DICATOR
TIP
IN
CENTER
Of
PUSH
ROD
Fig.
28-Camshalt Lobe Lilt Check
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