Datsun 1968-1973 510 Owners Workshop Manual page 60

Chapter
3 Carburatlon and exhaust
emission
59
nut
from the end of the primary throttle shaft
33 The carburettor
IS now
completely
dIsmantled and after
clean mg ready for inspection
34 If
a
compressed
air
hne
IS
available
carefully
blow
through
all
dnlllngs
Do
not use
a wire
probe to
clean
Jets
as It
will
only
upset the cahbratlon
35
Lay a straIght edge
across
the top
cover maIO
bocly and
flange
to ensure
that
no
part
IS
warped
causmg either
air or
fuel
leaks
3B I nspect all castmgs for sIgns of crackmg and
gasket
surfaces
for
unevenness
37
Check
the
seatmg
surface and the thread of the Idle
adlult
ment screw
for damage
38
Place
the choke
and
throttle shafts back
In
their
respectIve
bores and check for
an excessIVe
clearance If necessary obtam
a
new
shaft
or
flange
39 Reassembly
of the carburettor
IS
the
reverse sequence
to
removal Make
Sure
each part
1
clean for
refitting
and
always
use
new
gaskets
It WIll be necessary
to
check the fuel level
10
the
float chamber
as
descnbed
In
Section 11 The choke Interlock
adjustment will have
to
be
set as
descnbed 10 Sect
on
12
Also
check the pnmary and
secondary
throttle Interlock opening
as
deSCribed
In
Section
13
On moctels fitted With
an
automatic
transmiSSion
the dashpot adjustment
must
be
set as
deSCribed
In
SectIon 14
11 earburettor fu II 1
check and
adjustment
1 It will be observed that there
IS
a
hOrizontal line marked
on
the float chamber
glass to
md
cate
the
correct
fuel level Should
thiS level be
correct
before the carburettor
was
removed and
overhauled and the
anginal
float and needle valve have been
retained
It
should
not
be necessary
to re adjust
the fuel level
2 ThiS check and adjustment
may
be carned
out
With the
carburettor either
on
or off the mlet manifold
3 With the float chamber
cover glass
removed
Invert
the
carburettor and allow the float
seat to rest
against
the needle
valve
4 If the carburettor
IS on
the Inlet manifold 11ft the float With
the
fingers
until the needle valve
IS
closed
5 Bend the float tab gently
usmg
a
pair of long nosed pliers
until the upper face of the float
IS In a
honzontal
pOSition
6
With the carburettor
m
the normal fitted
pOSition
allow the
float
to
settle
Into ItS
down POSition
7
Measure the effective stroke of the float ThiS
IS
the distance
the float seat travels from
the
fully
down
to
the
fully
up
pOSition
The
travel should be
as
specified at
the
beginning
of
thIS Chapter
8 If oecessary bend the float stopper tab WIth a pair of long
nosed
pliers
until the
correct
travel
IS
obtained Refit the float
chamber gasket glass and
cover
Secure With the three retaining
screws
12
Carburettor
choke Interlock check
a
d adjustment
1 When the choke valve
IS In
the fully closed
pOSitIOn the
primary throttle valve should be
opened by a speCified
amount
which Will gIVe
a
set
throttle valve opening
anQle
from the
fully
closed pOSition
2 Refer
to
Section 9
and
remove the carburettor from the Inlet
manifold
3 Operate
the choke
operatlnq
lever
by
hand until the choke
valvp
IS In
the fully
closed POSition
4 USIOg
a
0051
In
11 3
mm
DCK 306
senes
028310
1072
mml OAF 328
series
diameter rod
as
a
gauge check the clear
ance
between the primary
throttle valve
and the valve bore
5
Should
the
throttle
valve clearance be larger
or
smaller
than
the gauge rod then
It
Will be necessary
to bend the choke
connecting rod With
a
pair of
pliers
until the gauge Just slides
between the choke valve and the bore
QJ
S
OU
Fog
314 Ramoval of choke tub
See 10
Q
C
FIlI
3 15 Throttla chamber
r
moved from
mall l body
See
101
r
FIg 3 16 Removal of throttl valve See 10
3
H
FIG 3 17
ADJUSTMENT OF FUEL LEVEL SEC 111
1 8al valve
2 Valve
seat
3 Float
4 Float
arm
5 Float
stopper
F lI 3 18 Adjustment
of float
t
See
111