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FUEL PUMP
The fuel pump
is
of the diaphragm type
and
is
driven
by
a cam
on the ca'mshaft.
When the rocker arm in
the pump is pressed upwards
by the cam,
the
dia-
p h'ragm is pu
ll
ed downwards and fuel is
drawn
up
to th
e pump.
Wh
en the rocker arm
returns,
the dia-
phragm is pressed
u1
pwards by a
spring
(15,
Fig. 2-68)
and fu
el
is
fe,d
to rthe f.loatchamber in t he
ca-
rburel1tor.
Wh en th
e
leve-I
in the f loatohambe,r is sufficient ly
hi
g
h,
t he
fl
oa.
t va lve closes and the pressure in the
delivery line rises until the pressure on the upper
side of the diaphragm exceeds the spring pressure
and pumping
-
act
ion
ceases. A ,diaphragm
(8)
is
fiflted
in the upper section of the
hou sing
and its purpose
is
to
obtain a
more
even flow of
fuel
to
the Hoat-
chamber.
The d iaphragm compresses the air in the
air
cover
(9).
When the diaphragm
(14)
sucks fuel,
t
he
compressed a irabove ,the d iaphragm (8) ma
in,
t a ins
the preswre in t he line to the f loatchamber.
REPAIR INSTRUCTIONS
The carb urettors are
speciall
y set by <the manufacturer
a nd f ine-a.d
ju st
ed w ith a
CO-meter
at t he factory.
In
orde'r not do d
istu
rb
th
e sett i-ng of t he carburettors,
it is
absolute-
ly
essent ia
i
t ha,t the
following repair in-
structions are accurately followed when any work is
to
be
done on the carburettors.
4
,*n
3----J,
'
~
2--~
-::----
-
-
6
7
f---- - 8
' - - -
--9
t----
--11
Fig
.
2-69.
Upper se ction
dismantled
1. Spring
2.
Suction chamber
cover
3.
Sealing
plug
4.
Screw
5, Hydraulic
damper
6.
Washer
7. Screw for diaphragm
8.
Washer
9.
Diaphragm
10.
Air
valve
11
.
Metering needle
VOL
V
O
103
401
PERIODICAL CHECK
Every
10,000
km
(6,000
mil
es) check that ·there is oil
in t he clamper cylinders (see, Fig.
2-71 ).
The spindle in the piston shou ld be fi
ll
ed to about a
1/4"
from the upper edge with oil approved as HAuto-
matic Transm ission Fluid, Type A".
7
6
5
4
3
2
n
B
o
©
~
a
1
I
1
lt
!
1
.1
Fig
.
2-70.
Floatch
amber d ismantled
1.
Screw for
floatchamb
e
r
2. Floatchamber
3
,
Gasket
4.
Rubber ring
5. Floatchamb
e
r plug
6.
Float
7.
Float pin
8.
Wa
she
r
9.
Float val
ve
VO LVO
103400
8
9
2 :
31
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