Datsun 1600 - Page 64

19 Fuel
System
7
Check that each
piston
falls
freely
on to
the
carburettor
bndge piece
with a distinct
metallic chnk when
raISed
with the
piston hftlng
pin
situated
In the base of
the
carburettor
If the above condition
does not
preva1l
the
Jet
IS off
centre and It will be
necessary
to centre
the
Jet
as detailed
earher
8
Start
the
engme
and
adjust
to a SUitable
Idhng
speed
at
operating temperature by turrung
each
Idlmg
speed
screw
by
an
equal
amount
9
Synchromze
the
throttle
settIngs by equalIzing
the
intensity
of the au Intake and
a1tenng
the
Idhng speed
adjusting
screws
accordingly
TJus can be aclueved
by
hstenlng
at each
au
Intake
In turn
uSIng
a
piece
of rubber
tube
or
a
stethescope
10
Adjust
the mIXture
by turmng
the
Jet adjusting
nuts
by equal
amounts either
up
or down untJI the
engme
f
J
1S
ldhng
at
a
fauly
fast
even
speed
WithOUt
a1tenng
the
Hlh lg speed adjusting
screws
t
I
It IS
unportant
that
dunng
tIus
adjusting operation
the
Jet
heads are
kept
In
contact With
the
adjusting
nuts
NOTE The uile
adJUstmg
nuts should not
need to be
screwed more than one
half of
a
turn
either
way
dunng
the
adJUSting
operatIOn
I
0
t
II If
necessary
reduce the
HlIlng
speed by
unscreWing
the
Idhng speed adjusting
screws
by equal
amounts
12 Check the mIXture
adjustment
of
each
carburettor
In
turn
starting
With the left
hand carburettor
by hftlng
the
piston approxunately
08
mm
0030 In
and
holding
It In
iJus
position
I
p
fl
If
the
speed
of the
engIne
Increases the mIXture of the
n
b ettor
IS
too nch and It should
be
re
adJusted by
tuiIjmg
the
Jet adjusting
nut In a clockWIse
duection to
F
obtain
a
fast even Idle
If
the
speed
of the
engine
Immediately
decreases
then
the mIXture
IS
too
weak and the nchness of the
mIXture
should be
11lcreased shghtly by turrung
the
Jet adjusting
nut
m
an
anti clockWise duectIon
The mIXture
adjustment
of the carburettor
bemg
adJust
p
correct If the
engIne speed
mcreases
shghtly
when the
piston
IS raised to the above mentIoned
checkmg
height
13
Repeat
these
operations
on the
nght
hand
carburettor and
adjust
as
necessary
then follow
by
checking
the
adjustment
again
on the left hand carburettor
It
may
be
necessary
to
make
a
shght
re
adJustment
to
the
Idhng speed
The mIXture IS correct when the beat
of the
exhaust IS
even
and
regulated
A
lea cil
st 1re
will cause
megular
mlsfinng
of
the
engIne
while a
nch mIXture Will cause the
engine
to hunt With the
probablhty
of black exhaust
fumes
14
When satisfied
that the carburettors are
adjusted
correctly
screw In the
auxiliary
shaft throttle
adjusting
screw until the
screw
end
Just
contacts
the
throttle
connecting
lever
r
u
ClIOKE
O1 ERATING LEVE
JET ADJUSTING
NUT
1
I
y
Side
VUNV ofrCarburettor
Showmg
Throttle Choke and
Jet
Lmkage
4 CARBURETTOR
SERVICE FAUI TS
SU T
PE ARBURETTOIl
TO RECTIFY PISTON STICKING
Piston
sticking
IS
generally
caused
by
an
accumulatIOn
of wrt or
gumrmness
mfue suction
chamber and
piston
assembly necessltatmg
the removal
and
cleamng
of
tIus
assembly
i
J
ii
iI
l
if
of
I
Remove the
piston damper
from
the suctIon
chamber
2
Mark
the
suctIon chami ier
and carburettor
body
remove the
suction chamber
attaclung
screws and 11ft off
I
the suctIon chamber and
piston
assembly
from the
carburettor
body
64
l
4
t
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