Datsun 1980 200SX Service Manual page 15

Engine
Maintenance
MAINTENANC
E
BASIC
MECHANiCAL
SYSTEM
ADJUSTING INTAKE AND
EXHAUST VALVE
a
EARANCE
Adjustment should be made while
engine
is hot
I
Start engine and
warm
up
engine
until
water
temperature
indicator
points
to the middle of gauge then
stop
engine
Valve clearance
adjustment
cannot
be made while
engine
is in operation
2
Remove valve rocker
cover
3
Set
so that high point of No
I
cam
lobe
points
down
No 1
earn
lobe
SMA005
When
turning
crankshaft
with
starter
remove
high
tension
cable
from
ignition
coil then
turn
it
Adjust clearance of half of the
valves
Adjust
only CD @ @
and
j valves
CD 4
Front
o 1lJf
Dt
DFJ
000
SMA049
MAS
ENGINE MAINTENANCE
Valve clearance
Hod
Intake
CD @
0 30
mm
0 012 in
Exhaust @ j 0 30
mm
10 012 i
n
I
Using
feeler
gauge
measure
clear
ance
between valve
stem
end and
rocker
arm screw
Feeler gauge should
move
with
a
very
slight drag
8M AQSO
2
If the clearance
is not
within
spec
ified value loosen rocker
arm
nut
and
turn rocker
ann screw
to
provide
pro
per
clearance
3 Hold rocker
arm screw
and
tighten rocker
arm
nut
SMA051
dl
Rocker
arm nut
16 22 N
m
1 6
2
2
kg
m
12 16 ft b
4 Recheck clearance
4
Turn crankshaft and
set
so
that
high
point of
No I
cam
lobe
points
above
0
No 1
earn
lobe
SMA001
Adjust ID ID @
and @
valves
using
same
procedure
as
for
Step
3
@ @
Front
kG D
tDf
OO ID
SMA052
Valve clearance
Hod
Intake @ @ 0 30
mm
0 012 in
Exhaust
ID ID
0 30
mm
0
012 in
5 Install valve rocker
cover
CHECKING
AND
ADJUSTING
DRIVE BELTS
I
Visually inspect
for
cracks
or
damage
Th belts should
not
touch the
bottom of the
pulley
groove
2 Check bell tension by
pushing
The belts should deflect
by
the spe
cified
amount
Drive belt deflection
8 12
mm
0 31 0 47 in
Applied prening
forc
98 N
10
kg
22lb