Table of Contents
Advertisement
2
3
10
4
5
6
:=::r-- - - - B
7
Fig. 2·49.
Carburettor,
front
,
from the
left
1.
Suction chamber
2.
Throttle
stop
screw
3.
Lever
4.
Primary throttle
5. Drill ing to
vacuum
side
of by-pass valve
6.
Drilling for
fuel-air
mixture
from
by-pass
valve
7. Throttle spindl
e
cam
(for
regulating secondary
throttle)
8.
Floatchamber plug
9.
Floatchamber
10. Fu
e
l
inlet
structed as an air valve regulated by the carburettor
tempera-ture and
maintains
the fuel-air mixture con s-
tant
i1
prespective of the fuel temperature.
The
f.ront carburettor is prov i'ded
wi,
t h a throttle
by-
pass valve (6, Fig. 2-50 and Fig. 2-58),
the
purpose of
which is to direct aregulated flow of fuel -air mix-
ture past the carbumttor throttle when this is closed
at high $lpeeds.
This ,reduces powerfully
the
volume of noxious exhaust
gases produced.
The throttle
spindle·
s are provided with seals to reduce
the wear on the spindies and bushes and also to
elimina,te air leakage.
The hot-start valve
(12
Fig. 2-48) is described on page
2 : 28.
The positiv vacuum connection for the ignition distribu
-
tor is locate,d on the rear carburettor.
FLOAT SYSTEM
Fuel flows into the floatchamber via the Hoat va·lve
(4, Fig. 2-51). The float
(l),
which is made up of twin
expanded rubber floats, is carried on a bridge on the
lower side of the carburettor housing. As the fuel
2:
24
1----.
..
2
3·-
---
4
Fig. 2-50.
Carburettor, front, from the right
1.
Ve
nting chann
e
l
from floatchamber
2.
Drilling for
air supp
ly und
er diap
hragm
3. Sea led
plug
VOLVO
103389
9
8
7
6
5
4.
Drilling for
air
sup
p ly
to
temp
.
comp
.
a
nd
idle trimming
screw
5. Sto p
screw
for
by-pass
va Ive
6. By pass
va Ive
7.
Idle trimming screw
8.
Temperature compensa
tor
9.
Hydraulic damper
level rises, the float lifts
and,
by means of
the float
arm
(2)
and tag,
closes the needle on
its seating when
the
correct
leve,
1 has been
attained.
The fuel goes
through
four
holes in
the floatchamber
plug a·nd to the inside if
the
jet, where
the
,Ievei is
the
$lame
as in
the
floatchamber.
Sealing between
the
floatchamber
plug and
·chamber is
provided by an
O-ring
.
10----4--5
4
3
Fig
.
2-51.
Float
system
1.
Float
4.
Float valve
2. Float Arm
5. Venting channel from float-
3.
Float
Shaft
chamber
to air
cleaner
Advertisement
Table of Contents
