Datsun 1000 - TO ADJUST IDLING SPEED AND MIXTURE

SECONDARY THROTTLE VALVE
PRIMARY THROTTLE VALVE
I
5
831T1f 1
0 230
nl
CIA GAUGE
ROO
MethOd of
Checking Primary
and
Secondary
Throttle
Interlock
Opening Typical
of Both Models
positioning
a
5
83 mm 0 230
in
diameter
rod
between the
primary
throttle
valve and valve
bore
I
Remove
the carburettor
from the vehicle
as
previously
described
2
Position
a 5 83 mm
0
230 in diameter rod
as
shown in
the
illustration between
the
primary
throttle
valve and
ihe throttle bore
FLOAT STOPPER
TAB
I
Carburettor
TQp
C ver with Float in
the Raised Position
Showing
Correct Float level
Fuel
Syatem B
3
Ensure
that the
secondary
throttle
valve is
fully
closed
4 Bend the
connecting
rod with
a
pair
of
pliers
until
it
just
comes into contact with
the
primary
throttle
lever
5 Check the
adjustment by withdrawing
the
gauge
rod
closing
both
throttle
valves and
then
gradually
open
the
primary
throttle
valve via the throttle iever until
the
secondary
throttle valve
just
commences to
open
In
this
position
the
gauge
rod should
just
slide
neatly
between the
primary
throttle valve and the
primary
throttle
bore
to ADJUST IDLING SPEED
AND MiXTURE
I
Remove the
vacuum access
plug
from
the inlet
manifold
2
Connect a
vacuum
gauge
with
suitable
adaptors
into
the
inlet manifold
3 Connect a tachometer
to
the
ignition
coil
4 Start
anti
run the
erigine
until it reaches riormal
operating temperature
5
Adjust
the throttle
idling
screw
until an idle
speed
of
600
rpm
is obtained on the tachometer
6
Adjust
the
idling
mixture
screw until the
highesl
vacuum
reading
on
the
vacuum
gauge
is
obtained
it
may
be
necessary
to re
adjust
the
jdle
speed during
this
operation
7 Stop
the
engine
and discorinect
the
vacul
m
gauge
and tachometer
NOTE
An exhaust
gasanalyser
ifavaiiable
can
be used to
adjust
the mL rture or to check as a
comparison
with the
vacuum
gauge readings
An
uptimum
mixture
strength
reading
is desired on the
gas
analvser at
engine
idle
Turning
the
idling
mixture screw in
a clockwise direction
gives
a
lealler
mL rture and anti clockwise a richer mixture
10
5
rill
U13 I
MODEL
1200MDOEl
41
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