Fuel Pump Removing And Dismantling/Inspection/Assembly; Carburetor Idling Adjustment; Fast Idle Opening Adjustment - Datsun 510 series Workshop Manual

and
seats
or a
weak
diaphragm
return
spring
A
pressure above the specified figure
may
be due
to
an
excessively
strong and
tight diaphragm
Capacity
test
The capacity
test
can
be
carried
out
when the static
pressure
has been
tested and conforms with the specified figure
of 0 18
kg
sq
cm
2 6Ib
sq i n J
Disconnect the fuel line at the carburettor and
place a
container under the end of the
pipe to act
as a
fuel sump
Start
the
engine
and
run
it
at
a
speed
of 1000 Lp
m
The
amount
of fuel delivered from the
pump
in
one
minutc
should
be
1000
cc
2 1 US pt
If petrol does not
flow from the
opcned
end of the
pipe
at
the
correct rate
then either the fuel pipe is clogged
or
the
pump
is not
operating correctly
If the latter
cause
is suspected
the
pump
must
be removed
and
inspected
as
described below
FUEL PUMP
Removing
and
Dismantling
Before
removing
the
pump
take off the
petrol
tank
cap
and disconnect the
pump
inlet and outlet
pipes
Blow
through
the pipes
with
compressed air
to
make sure that they are
not
clogged
Remove the pump
retaining
nuts withdraw the
pump and
dismantle it in the
following
order
Referring
to
Fig D l
Take
out the
screws
holding the
two
body halves together
and scparate the upper
body
from the lower
body
2 Remove the
cap
and
cap
gasket
3 Unscrew the eI bow and
connector
4
Take off the valve
retainer
and
remove
the
two
valves
5
To
remove
the diaphragm diaphragm spring and lower
body sealing
washer
press
the
diaphragm
down against
the force of the
spring
and tilt the
diaphragm at
the
same
time
so
that the pull rod
can
be unhooked from the rocker
arm
link Fig
D
7
The rocker
arm pin can
be driven out
with
a
suitable
drift
FUEL PUMP Inspection and Assembly
Check
the
uppcr
and
lower body
halves for cracks
Inspect
the valve and valve spring assembly for signs of
wear
and make
sure
that the
diaphragm
is not holed
or
cracked also make
sure
that the rocker
arm
is
not
worn
at
the point of
contact
with the
camshaft
The rocker
arm
pin
may
cause
oil
leakage
if
worn
and
should be renewed
Assembly is
a
reversal of the
dismantling procedure
noting
the following points
Fit
new gaskets
and lubricate the rocker
arm
link and the
rocker
arm
pin
before
installing
The pump
can
be tested by holding it
approximately
I
metre
3
feet
above
the level of fuel and with
a
pipe connected
between the
pump
and fuel strainer
Operate
the rocker
ann
by
hand the pump is
operating
correctly if fuel is drawn
up
soon
after the rocker
ann
is
released
CARBURETTOR IDLING ADJUSTMENT
The idling speed
cannot
be
adjusted satisfactorily
if the
ignition timing
is incorrect if the
spark plugs
are
dirty
or
if
the valve clearances
are
not correctly adjusted
Before
adjusting
the
idling speed
set
the hot valve
clearances t o 0 25
mm
0 0098 in for the intake valves and
0 30
mm
0 0118 in for the exhaust valves as
described in
the ENGINE section
Idling adjustment is carried
out
with the throttle stop
screw
in
conjunction
with the
idling adjustment screw
See
Fig D 8
Run the
engine
until it attains its normal
operating
temperature
and then switch off
Starting from the
fully
closed
position
unscrew
the
idling adjustment screw
by approximately three
turns
Screw the throttle stop screw
in by
two
or
tftr
e
turns
and
start
th
engine
Unscrew the throttle stop
screw
until the engine commences
to
run
unevenly
then
screw
in the
idling adjustment
screw so
that the
engine
runs
smoothly
at
the highest speed
Readjust
the throttle
stop screw
to
drop
the
engine speed
of
approximately
600
r
p
m
is obtained
WARNING Do
not attempt to
screw
the
idling adjustment
screw
down
completely
or
the
tip
of the
screw
may
be damaged
FAST IDLE OPENING ADJUSTMENT
The choke valve
is
synchronized
with the throttle valve
and connected to
it
by
levers
as
shown in
Fig
D 9
The fast
idle
opening
can
be check by fully closing
the choke valve and
measuring
the clearance between the primary throttle valve and
the wall of the throttle chamber This clearance
being
shown
as
A
in the illustration The clearance for the carburettor
types is
as
follows
Carburettor
type
Throttle
opening
angle
180
180
190
Dimension A
213304 361
13304 4 I
13282 331
1 55mm 0 06lin
1 55mm 0 06Iin
1 3
mm
0 051
in
35