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GROUP 23
FUEL SYSTEM
DESCRI PTION
2
3
4
5
6
25
24
23
22
21
20
7
8
9
19
18
10
11
17
12
13
VO LVO
104462
Fig.
2-48.
Ca
rburettors,
B 30 A engine
l
.
Cold -air
hose
11. Rear carburettor
19.
Idle
trimming screw
2.
Constant
temperature
device flap
12.
Ho1 s1ar1 valve
20.
Manifold
wit
h
preheating chamber
3.
Warm-air hose
13. Choke wire
21. Bracket
4. Temperature compensator
5. Front
carburettor
14.
Vacuum hose for distributor
(negative vacuum setting)
22.
Throttle controi
23. Plug (connection for vacuum hose
on cars with venting filter)
6. Clamp
for
air cleaner cover
15.
Vacu u
m
hose
for bra ke servo
7.
H01
air
hose
for crankcase gases
8. Fuel
hoses
16.
Vavuum hose
for distributor
(positive vacuum setting)
24. Throttle by-pass valve
25
..
Idle
trimming screw
9. Air cleaner
17.
Throttle stop screw
10.
Temperature compensator
18.
Hose for
crankcase
gases
The B
30
A
eng
in
e
is fitted with two horizontal
car-
bure·
t tors ,of type
Stromberg
175
CD-2SE
(Fig.
2-48),
the
cons~ruction
of
which
is
shown
in Figs.
2-49,
2-50,
2-52
and
2-53.
This type
of carburettor
has been .designed
with a view to the
exhaust
emission
cO'n~rol
system.
It
is
provi,ded with a fixed
je.t,
pressed
into
the carburettor
housing, the fuel flow
ortfice
area of which is varied
by means of a movable tapered needle.
The
po·
s
ition
of the needle
is
determined by the carhurettor hous-
ing
vacuum
opera:f1ing
an air valve
in
which the needle
is fitted
in
a
spring-,Ioad
ed s uspens
ion
.
The
spr
ing
force
always presses the needle against the same side of
the
jet,
and rhis
ensures
an accurately
oontro
Hed
fuel
flow through the jet.
The
carburettor consists of three main parts of
light-
alHoy, the middle
pa1
rt of which comprises the carbu-
retto,r housing. The
lower
section is made up of a
floatchamber, which encloses
.the jet
and the fleat.
The upper
,
s
ection
consists ef a suotien chamber cever,
which forms a
suctien
·
c
hamber
together
with
a
diaphragm fixed in the air valve. The suctien cham-
ber Iregulates the air valve
I·
i ft
and
th
e
reby
the
leca-
tion of the needle in the
jet.
By means ef
'
c hanne
l,
s
in
the valve, the suctien cham-
ber is
linkedte
the spuce between the carburettor
throttle und valve.
80th carburettors are
fi,
t ted with a temperature com-
pensater (8, Fig.
2-50
and
2,
Fig.
2-53.
This
is
con-
2:
23
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