Alfa Romeo 33 Workshop Manual page 31

If notwithinspecifiedvalueorincaseof'
e n g i n e tune u p a f t e r e n g i n e ;
overhauling or after having cleaned or
involving mixture meteringscrew
a n d throjtle v a l v e s c r e w 3 i s
requised. In this instance, proceed as
follows:
s e a l s f r o m m i x t u r e
metering, screw a and from throt-
tle valve sctew 0.
( 2 ) Tighte~n i d l i n g s c r e w @ all t h e
(3) act on throttle valve
s c r e w @ 'and on mixture metering
p r e s e n t : ~
C O %
( 4 ) Loosen idling
s c r e w OI ti,ll a 900 + 1 0 0 0 rpni
idling speed i$ reached.
Act mixture
screw @ till the smoothest possible
e n g i n e r u n n i n g i s o b t a i n e d , w h i l e
keeping C$I% within the prescribed
values.
i n t o p l a c e m i x t u r e
m e t e r i n g ànd' t h r o t t l e v a l v e s c r e w
seals.
is desired, jus? act on relevant idling
1 Idling mixture me'tering screw
valve adjusting screw
COMPLETE CAR
Double carburetor models
throttle valves
1
B e f o r e b e g i n n i n g t h i s t e s t check
accelerator table adjustment ' 1 Refer
t o : G r o u p 0 4 - A c c e l e r a t o r Gable
adjusting
metering
1.
vacuometer in the appropriate fittings.
2 . S t a r t t h e e n g i n e a n d r u n i t t o n o r m a l
r u n n i n g t e m p e r a t u r e
3 With the gear shift in neutral, open
t h e mercury vacuometer valve and
m a n o m e t e r s fall w i t h i n 4 0 m m H g .
right carburetors by acting on the
throttle valve screws. Should there be
00-l WI
cylinders of the same carburetor then it
c a r b u r e t o r
o f
c a r b u r e t o r .
as follows:
4. Make sure that all cylinders are
functioning correctly by grounding one
spark plug at a time and checking that
theincreaseinr.p.m. isidenticalforeach
t h a t t h e
S O
misalignment (40 mm Hg) between
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 -
1 0 0 0 r.p.m. by acting on the throttle
valve screws, c h e c k i n g t h a t t h e
m a n o m e t e r r e a d i n g s fall within the
specified values.
6. Using the CO% tester, check that
the exhaust CO emissions are 1.5 - 2.5%.
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