Specifications

Fuel
System
A
carburetor has two enemIes dirt
and water
Clogged
au
and
fuel filters
may
allow dirt
and
water to
get
mto the
carburetor
causIng
It to malfunctIon
Some of the
symptoms
of
a mal
functIonIng
carburetor
are hard
start
mg surgIng
or
mISSIng
at
hIgh
or low
speeds
and
poor gas
nuleage
In
any
event the
carburetor
reqUIres
attentIon
to cure the
problem
In t us
sectIon
you
wIll
find
mstruc
tIOns
on how to
make the vanous ad
Justments
on
your
carburetor
But
be
fore
you
make
any
adjustments
makea
qUIck
VISUal
InspectIon
under the hood
It
may
save
you
lots of
tllTIe
and
money
FIrSt
of all make
sure all hoses and
vacuum lInes are In
good
COndItIOn and
properly
attached Make sure the fuel
and aIr filters
are clean
and
properly
Installed Check
the
condItIon of the
carburetor
lInkage
If It IS coated With
grease
and
011 or corroded
spray
It WIth
a
carburetor
degreaser
and lubncant
and work
a few
tImes
by
hand If
you
have
a nunor
stallIng problem pour
a
can
of addItIve
carburetor cleaner
Into
the fuel tank Also It IS
generally
a
good
Idea
to check and correct If
needed the
tInung
If
In
doubt
You
should be able to
replace
a car
buretor
In
an hour
and a
half Of course
extra tllTIe
wIll
be needed
for
any
ad
Justments
To remove rebUIld and In
stall a
Datsun
carburetor
you
d better
figure
on
your
car
beIng
tIed
up
around
four
hours
When
bUYIng
a
used carburetor
from
a
salvage yard
or a remanufactured one
be
sure
you
are
gettIng
one from the
same
make
and
year
as
your
car Model
B210
carburetors from 1974
to
1977
Will
fit
any
B210 of that
penod
how
ever
you may
find It dIfficult to obtam
42
peak performance
and
mIleage
as well
as meet
emISSIOn standards
Car
buretors on
all 1973 to 1977 model
610s and
710s are
Interchangeable
but
you may
again expenence
the same
tune
up performance
and emIssIon
problems
So
always
be sure
you
have
the
nght
carburetor for
your
car
CARBURETOR
DESCRIPTION AND
IDENTIFICATION
All 1974 77 Datsun B210s are
eqUIpped
WIth
a model DCH306
car
buretor
VanaUons of
thiS
carburetor
such
as for transnussIOns or CalifornIa
cars are denoted
by
a
suffIx For
example
a
1974 B210
eqUIpped
WIth
a
manual
transmISSIOn uses a DCH306
6
carburetor
With
an
automatIc It S
a
DCH306
7
carburetor The
model
number
and
suffix
are
pnnted
on
the
carburetor
body
The DCH306
carburetor
IS a
downdraft
type
WIth
two ventun It
contains
a
pnmary system
for normal
runnIng
and a
secondary system
for
full load
runnIng
and
heavy
accelera
tIon The float
system
that
regulates
fuel level IS common to
both
the
pnm
ary
and
secondary systems
A
second
ary
swItch over mechanISm accelerat
Ing
system
anti
dIeselIng
solenOId
valve and
power
valve mechanIsm
are
also
used
All 1973 77 Datsun 610s and lIOs
are
eqUIpped
wIth a model DCH340
carburetor Vanatlons of thIS car
buretor are also denoted
by
a suffix For
example
1976 CalIfornIa cars
equlp