Alfa Romeo 33 Workshop Manual page 32

T obtain better CO exhaust emission
O
adjustment it is necessary to operate
measuring the values cylinder by
cylinder using special service tool
C, 3.0054 connected as follows:
exhaust manifold from cylinder
h e a d s .
2 A. Now~fit small flanges C.2.0054
with relevant gaskets and pipes for
collection, of exhaust fumes - bet-
ween Bach exhaust manifold flange
and relevant fitting on cylinder
heads. ~
3 A. C o n n e c t e x h a u s t m a n i f o l d
The other ends of the four collection
pipes emerge in the engine compart-
ment andi being equipped with suit-
able pfugs, are set up to test each
cylinddr CO%.
7. Ch,eck the idle r.p.m.
necessary adjust it again repeating
the operations described at step 5.
8. @-set the play in the idle levers
to 1 mm by tightening the stop screws
and th'en check that the carburetors
of acceleration (1200 - 1300 r.p.m.).
Adjust'the stop screwsfurther toobtain
Perfect synchronisation of the carbu-
r e t o r s . ~
P A 3 3 3 5 0 0 8 8 3 3 0 0
COMPLETE CAR
The procedure is valid for 1.7 elec-
2. Connect an exhauster to the
exhaust tail-pipe.
3. Start the engine and run it to
normal running temperature (Engine
4. With the gears in neutral and the
ancillary devices tut out check that
t h e e n g i n e r.p.m. falls w i t h i n t h e
specified values.
For 1.7 electronic injection engines
with catalytic convertor.
idle r.p.m. 950 _ 5.
For 1.7 electranic injection engines
idle r.p.m. 800 - 900
within these values, adjust by operat-
ing as follows:
(a) Loosen the locknut @ and turn
the screw @ until the correct r.p.m.
is obtained.
(b) Lock the locknut 0
and if
1 Locknut
2 Idle r.p.m. adjustins screw
After adjustment of the idle r.p.m.
following the above described pro-
adjustment (if necessary) of the ex-
haust emissions by operating as fol-
lows.
Switch on the gas exhauster, start
the engine and run it to normal runn-
ing temperature.
2. With engine on idle and using a
the percentage of CO and the quantity
of hydrocarbons are less than the
specified values.
Admissible CO% 0.8 - 1.7
1 Exhaust tail-pipe
2 Probe of exhaust tester
3. Should the CO% be above the
admissile limit it Will be necessary to
act on ~ the appropriate screw p9s-
itioned iIn the debimeter.
4. It Will then be necessary to check
the "ldle r.p.m. Check" Will have to be
repeated.