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218
FIAT· 850 PASSENGER CARS
~
A . , . , and the throttle (52) blocks the air suction to
the primary throat while the throttle (35) is brought
ajar by the rod (56) and lever (57).
The discharge tube (10) is thus delivering a high
rated mixture which enables quick starting of
engine.
Once the engine has started, the suction vacuum
causes the throttle (52) to open partially against the
spring (53) so that the mixture delivered
will
be
reach enough to enable the engine to run properly
although cold.
When the engine begins to warm
up, the choke throttle (52) should be opened gra-
dUally.
As soon as the rated temperature of the engine
has been reached the easy starting device must be
cut off (position (
B .,.,).
The choke throttle (52) is
held in the wide open position
by
the lever lug
(54), while the throttle (35) returns to idle.
Instructions for Using the Easy Starting
Device.
STARTING COLD ENGINE
Pull the easy starting knob on floor tunnel all the
way out to throw in the choke device (position
«
A
~,
fig. 433).
WARMING UP ENGINE
During this period, whether the vehicle is station-
ary or moving, the knob should be returned gradually
and with short pauses to the off position, thus ensuring
that the starting mixture supplied to the cylinders is
never in excess of the engine's actual requirements.
ENGINE RUNNING NORMALLY
As soon as the normal engine temperature is
reached the control knob should be fully returned
to the closed position
(ll
B
I»
thus cutting off the
choke device.
CARBURETOR SETTING DATA
Primary Throat
I
Secondary Throat
--
- - - - -
Type
.
.
·
·
·
·
Weber 30 DIG I, dual barrel
- - -
Throat bore
.
.
.
1.181 "
(
30 rom)
1.181" ( 30 rom)
- -
Primary Venturi
·
·
·
.827"
(
21 rom)
.905" ( 23 rom)
- -
-
-
Main jet
.
·
.
·
·
.
·
.045" (1.15 rom)
.045" (1.15 rom)
Idling jet
·
·
.018" (0.45 rom)
.020" (0.50 rom)
.
Air bleed jet .
·
·
·
.
·
·
.073" (1.85 rom)
.073" (1.85 rom)
-
- -
Accelerator pump jet
.016" (0.40 rom)
Pump recirculation orifice .
·
.
.
·
.016" (0.40 rom)
-
Needle valve
·
.
.
.
·
.059" (1.50 rom)
- - -
-
Super-feeder device
. ·
.
.043" (1.10 rom)
Easy starting device
choke throttle valve
- -
Float level (with gasket)
.
.
.
. .
.236"
(
6 rom)
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