Su Twin Carburetor: Centering The Jet; Su Twin Carburetor: Float Level Inspectin And Adjustment/Starting Interlock Valve Opening Adjustment; Hydraulic Damper; Fuel System Technical Data - Datsun 510 series Workshop Manual

Connect the fuel line from the float chamber
to
the nozzle
nipple
and
tighten
the
retaining clip
Pull
out the choke lever
and place the connecting plaie betw
n
the washer and sleeve
collar Screw the plate
to
the nozzle head and check that the
collar is installed in the hole
in
the plate by
mo
ing the choke
lever
as
necessary
Recheck the piston to make
sure
that it falls freely without
binding
SU TWIN CARBURETTOR Centering the jet
Remove the
damper
oil cap
nut and
gradually
raise the
lifter
pin
4 in Fig D 17
Continue
to
raise the lifter
pin until the head of the pin
raises the piston by approximately 8
mm
0 31 in When the
lifter pin is released the piston should drop freely and strike
the venturi with
a
light
metallic click If the
pi st o n
does
not
fall
freely
it will be necessary
to
dismantle the carburettor in
the
manner
previously described
SU TWIN CARBURETTOR
FLOAT LEVEL
Inspection
and
Adjustment
The fuel level in the float chamber
can
be checked
using
the special gauge ST 19200000 Remove the float chamber
drain plug and install the special
gauge
as
shown in Fig D 20
Start the engine and allow it
to
run
at
idling speed The
fuel level is
conect
if it is indicated
on the glass
tu
be
at
a
distance of 22 24
mm
0 866 0 945 in below the
top
of the
float chamber
The level of the fuel
can
be corrected if necessary by
adjusting the float level in the following manner
Take
out
the float chamber
coveT
securing
screws
and
lift off the
cover
and attached float lever Hold the
cover so
that
the float lev
r
is
facing upwards
Lift the float lever and then
lower it until the float lever
seat
just contacts the valve
stem
The dimension uH in Fig D 1 should be 11 12
mm
0 4 3
0 4 7
in
and can be corrected
by bending the float lever
at
the
point indicated
SU TWIN CARBURETTOR
Starting interlock valve
opening
adjustment
To
adjust
the
starting interlock opening the connecting
rod 4 in
Fig
D 22
1 must
be bent
using
a
suitable
pair
of
pliers The throttle opening
can
be increased by lengthening
the connecting rod
or
reduced by shortening the rod
The throttle opening
is
correctly
adjusted
when the
clearance
8 between the throttle valve and throttle chamber
is
set to
0 6
mm
0 023 in with the choke lever half completely
out
HYDRAULIC DAMPER
The
damper
oil should be checked
approximately
every
5000 km 3000 miles To check the oil level
remove
the oil
cap
nut
as
shown in
Fig D 23 and check the level of oil against
the
two grooves
on
the plunger rod Top
up
with SAE 20
engine
oil if the oil level is below the lower of the
two
grooves
Take care
not to
bend the plunger rod when
removing
and
replacing
the oil cap
nut and make
sure
that the
nut
is
sufficiently tightened by
hand
TechnIcal Data
Engine
Model Ll4 I400cc
Primary Secondary
28mm 32mm
21x7mrn 28xlOmm
96
165
60 60
I Omm
220 100
16
Outlet diameter
Venturi diameter
Main
jet
Main air bleed
1 st slow air bleed
2nd slow air bleed
Economizer
Power jet
Float level
Fuel pressure
Main nozzle
55
22mm
0 24 kg
sq
cm
3 41b sq in
2 2mm
2 Smm
SU Twin Carburettors
Type
Bore diameter
Piston lift
Jet needle
Nozzle jet diameter
Suction spring
IUL 38 W6
38mm 1
4961 in
29mm
1417
in
M 76
2 3 4 mm 0 0921 in
No 23
Float needle valve
inner diameter
Float level
15mm
0 059 in
23mm 0 9055 in
42
Ll6 1600cc
Primary
Secondary
28mm 32mm
22x7mm
29xlOmm
102 165
60
60
10mm
180 100
16
Ll8 l80Occ
Primary Secondary
30mm
34mm
23x14x7mm 30xlOmm
102 170
60 60
I Omm
210 100
16
55
22mm
55
22m
2 3mm 2 5mm 2 3 mm 2 8mm
Throttle clearance
at
full throttle
Position
at
full throttle
0 6mm 0 0236 in
6 50
FUEL PUMP
Type
Delivery
amount
Mechanical
1000cc minute
at
1000
r
p
m
0 18 0 24
kg
sq
cm
2 5 3 4 1b sq in
from eccentric
on cam
shaft
Delivery
pressure
Drive