Technical data
COMPLETE CAR
If notwithinspecifiedvalueorincaseof’
engine
tune
up after engine;
overhauling or after having cleaned or
replaced
the
carburetor, an adjustment
involving mixture meteringscrew
1
C!il
and
throjtle
valve screw 3 is
requised. In this instance, proceed as
follows:
,(
1)
RemoJe
seals from mixture
metering, screw
a
and from
throt-
tle valve
sctew
0.
(2) Tighte~n idling screw
@
all
the
,way’.
(3)
,Now
act on
throttle valve
screw
@
‘and
on mixture metering
screw@
till
following conditions are
present: ~
Mm
750
+
boa
CO%
0.5,+
1% total
(4)
Loosen
idling
adjusting
screw
OI
ti,ll
a
900
+ 1000
rpni
idling speed
i$
reached.
(5) Act
don
mixture metering
screw
@
till
the smoothest possible
engine running is obtained, while
keeping C$I% within the prescribed
values. ~
,,
~ % CO
0,5
+
1
(6) Fit
back
into place mixture
metering ànd’ throttle valve screw
seals.
(7) If further optimizing of idle-rpm
is desired, jus? act on relevant idling
adjusting,screw
@
.
1
Idling mixture me’tering screw
2
Idling adjusting screw
3
Throttle
valve adjusting screw
May
1988#
Double carburetor models
Check idling-rpm, CO% on each
cylinder
and line-up of carburetor
throttle valves as follows:
Before beginning this test
check
accelerator
table
adjustment
‘1
Refer
to: Group 04
-
Accelerator
Gable
Adjustment)
misalignment (40 mm Hg) between
cylinders of the
same
carburetor then
it
Will
be necessary to replace the
carburetor.
4. Make sure that
all
cylinders are
functioning correctly by grounding
one
spark plug at a time and checking that
theincreaseinr.p.m. isidenticalforeach
cylinder.
~
1.
Insert
the tube of the
mercury
vacuometer in the appropriate fittings.
2. Starttheengineandrunittonormal
running temperature SO that the
temperature
is equal to or greater than
45oc.
3 With the gear shift in neutral,
open
the
mercury
vacuometer valve and
check
that‘ the Ap values of the
manometers
fall
within 40mm Hg.
Correctanydifferencesbetweenleftand
right carburetors by acting on the
throttle valve screws. Should there be
00-l
WI
1
Electronic rev counter
2
CO tester
If necessary
act
on the mixture
meter-
ing screw of the
out-of-tune
cylinder
until correct functioning is obtained.
5. Adjust the engine speed to 850
-
1000 r.p.m. by acting on the throttle
valve screws,
checking that the
manometer readings
fall
within the
specified values.
6. Using the CO% tester, check that
the exhaust CO emissions are 1.5
-
2.5%.
PA333500883300