Datsun 1600 - CARBURETTOR SERVICE FAULTS; PISTON STICKING RECTIFICATION; FLOAT NEEDLE STICKING RECTIFICATION; FLOAT CHAMBER FLOODING RECTIFICATION

3 Remove the
piston
and needle
assembly
from the
suction
chamber bore and take off
the
damper spnng
and
washer
Handle the
piston assembly carefully
to avoid
bendmg
the
needle Do not
stretch or
alter
the
tensIOn
of
the
damper spnng
m
any
way
4 Clean all
parts thoroughly
m
petrol
or
solvent and
blow
dry
With
compressed
au Do
not use
emery
cloth
or
any
sundar abraSive on
the
suctIOn chamber bore or
the
piston
5
POSitIOn the
damper
sprmg
and
washer on
the
piston
rod lubncate the
piston
rod
spanngly
with
one
or
two
drops
of
hght engme
oil
and
msert the
piston
assembly
mto the suction chamber bore
6 Fit the
suctIOn chamber and
piston assembly
to
the
carburettor
entenng
the
needle
m the
Jet
align
the
marks
made on
dlsmantlmg
and fit the
retammg
screws Raise
the
piston
and needle and
tighten
the screws Check that the
Jet
IS centred and that the suction chamber SitS
squarely
on
the
carburettor
body
7 Pour the
recommended amount
of
hght
engIne
011
mto
the
top
of the
piston
rod and
replace
the
piston
damper
tlghtemng
the
nut
firmly
TO
RECTIFY
FLOAT
NEEDLE
STICKING
A
sticking
float needle
IS
generally
indicated
by
a
lack
of fuel m the
float chamber
proVided
of
course the fuel
pump
IS
dehvenng
an
adequate
supply
of
petrol
when the
dehvery
pipe
IS disconnected at
the
carburettor
Float needle
stIcking
IS
usually
caused
by
a
gnt
or
foreign
matter
In
the needle
and
seat
assembly
or b a
Fuel
System
20
defectIve needle valve and seat
assembly
To
rectify proceed
as follows
Disconnect
the
fuel
dehvery pipe
and
remove
the
float
chamber cover Remove the
needle and seat
assembly
from
the
cover
Usmg compressed
a
r blow
through
the
needle
valve and
seat
assembly
and the
passage
m
the cover
Remove
the float and blowout the float chamber
To aVOid
a recurrence
01
the
trouble
It IS
usually
necessary to
dram
and flush the fuel tank
clear the
fuel
filter
and
blowout the fuel hnes
If
necessary
renew the needle valve and seat
assembly
and check the
float level
TO
RECT
FY FLOAT CHAMBER FLOODING
Float chamber
floodmg
IS mdlcated
by
fuel
leakage
from the dram hole
m the
float chamber cover and
IS
usually
caused
by gnt
or
foreign
matter
between the
float
needle and ItS
gUide
To
rectify proceed
as for
a In
TO RECTIFY FLOAT
NEEDLE STICKING
r
l d
tf
J
TO RECTIFY JET BLOCKAGE
w
Iilt
To check
for
Jet blockage
raise the
suctIOn
plSt l
flood
the
carburettor and
watch the
Jet
Absence
of
a
f e
l
lt
flow
of
petrol
will
mdlcate a
blockage proVided
the fU
t
pump
IS
dehvenng
fuel to
the
float
chamber
To clean the
blockage
start the
engIne open
the
throttle
and
block
off the carburettor au In take
momentanly
With the hand
until the
engIne
starts to
race
If thiS fails to clear the
blockage
then the
Jet
will
have
to
be removed for
clearung
t
11
1I
I
2
DESCRIPTION
5 FUt
l
P
J IP
The rubbensed fuel
pump
diaphragm
IS
supported by
two metal diSCS
and
IS
speCially
treated so that
It
IS
not
effected
by
gasohne
The fuel
pump
IS
a
mechanically operated diaphragm
type
actuated
by
a
rocker
rIl lI sembly
which m
turn
IS
operated by
an
eccentnc
on the
front of the
engIne
camshaft
When the carburettor float chamber IS full
and
the
carburettor needle
valve
IS closed
pressure
m the
pump
outlet
pipe
will
hold the
pump diaphragm
downwards
agamst
the
pressure
of the
waphragm spnng
At
thiS
time the rocker arm
assembly
will run
freely
on
the
diaphragm
shaft until the
pressure
m
the outlet
pipe
IS
reheved
When the outlet
pipe
pressure
IS reheved
the
pump
diaphragm agam
nses under
pressure
from the
diaphragm
spnng
and mto
operation
by
the rocker
arm
assembly
A
spnng
holds the
rocker
armm
constant
contact With
the eccentnc on
the camshaft
to mmlmlSe
operatmg
nOISe
A
seal wluch
runs
on
the
diaphragm
shaft and
wluch IS
retamed
m
the
fuel
pump
lower
body by
the
diaphragm
spnng prevents engine
oil from
entenng
the
upper
sectIOn
of the
pump
lower
body
UPPER
BODY TOP COVER INLET
CONNECTION
6S
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