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REPLAC ING THE BY-PASS VALVE
The by-pass va,lve is replaced
complete
. The va lve is
re move
d
fro
m
t he ,carburettor
by
scre
w
ing out the
t hree
screw
s
(6,
Fig.
2-78).
Clean th
e
ga sket sudace
and fit th
e
new va,lve with gask'et
(l).
Ca
rry
ou,
t
a
function te st. Note that th
e
by-pass
va,lve
is marked
y on the cover.
REPLAC ING THE TEMPERATURE COMPENSATOR
The temperoture comrpensator
is
replace:d comp lete.
It
is
removed from
th,
e carbure#or by unsorewing t>he
screws (6,
Fig.
2-77).
Take out the old seal
(l
)
from the
carburettor and fit a new
one.
Pla'
c e a new
se,a'l
(2)
on
the
temperoture
compensator and fit the compensator.
The temperarure compensator is ma.rked
1160"
(see
11,
Fig. 2-77).
REPL
AC ING THE METE
RI
NG NEEDLE
Af ter replacing the metering needle, the
fo llowing
check with
a
CO-meter is
reco
mmended.
l
.
Remove the
air
va,lve
from
the
ca
rbure#or ond
dean
it.
2.
Remove
the
needle by unscrewing
Jthe
,lock
screw
and pull
the
needle out with
the spring suspen-
sion.
3.
Before
fitting
the new needle,
check that
the
needle designati,on is BlAM.
The
designal
t ion is punched on the needle and
can
be re,ad by pu'I,ling the needle out of the
spring
suspension
for
lenough
to reveail the designation.
4.
Fit
Ifhe needle wi,th the
spring
suspension
so that
the
flat surface
faces
rthe
lock
:sorew.
The needle
sho Ulld inofine
from
the
hol,
e s in
the
a'ir valve, i.e.
in towards the air c1eaner flange.
The needrle shoulld be ,inserted
so far
that the
plastic washer lies
f,
l ush with the valve,
see Fig.
2-83.
Tight,en the lock
,sorew.
5.
Fii.t the
air valve in the carburettor. Plug-seal
tthe
suction chamber
cover.
DAMPER DEVICE
If the engine does not reaet properly during
accelerat-
ion, the reas on may be a faul.ty clearance on the
damrper plunger, the axial c1earance ,of which (see A,
Fig.
2-84
should be
1.1-1 .9
mm
(0.04"-0.07")
early
prod.
0.05-1.1 (0.02"-0.04").
The diameter on the
plunger should be
9.32-9.35
mm
(.36-.37").
\&~hW
Fig.
2-83. Fittin
g the
metering needle
W ,ith
any fault
in
the dampe'r p
lun
ger change
i,
t com-
p
lete.
If
,
t he
damper
device
,is
to
function
,correctly,
then
the
level
of
the
damper o
il
must be correct (see Fig.
2-71 ).
The
interva,1
prescribed for the pef1iodical
check
is
10.000
km
(6.000
milles).
ADJUSTING THE ACCELERATOR PEDAL
The
leng,
t h
of
the
I'
o ng, ve'rtica'l ,Iink for the pedal is
adapted
so
that there is a
dearance
of
1
mm
(0.039")
between the throttle lev,er lug and
the
fuN
throttle
stop on
,
t he ca,rburettors, when the
ar
ocelera:tor
peda,1
is fu,I,ly
depf1essed.
With a
fully
depressed pedal, the
force of the driVler"s foot is taken urp by
the
toe-plate
without
limposing
unneces'
s ary
loa1
ding on the
throt,
t le
controI.
VOLVO
1038 18
Fig. 2-84.
Damper plunger clearance
2:
37
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