Chevrolet Fleetmaster Series 1947 Owner's Manual page 27

There are two adjustments
on the carburetor, one for
idling mixture and the other
for idling speed. These adjust-
ments should be made to-
gether.
To adjust. the idling mix-
ture, proceed as follows: Open
the idle adjusting screw, "A,"
Fig. 27, from 1 to 2 turns. Let
engine idle. Try turning screw
both ways from this posi-
tion until the best results are
obtained.
To adjust for idling speed,
Fig. 27-CaJ"buretor Adjustment
proceed as follows: With the
hand throttle on the instru-
ment panel closed, set the throttle lever stop screw, "B, " Fig. 27,
so that the engine runs at 450 to 500 revolutions per minute.
If the engine runs too fast, back the screw out; if too slow.
turn it in until the proper speed is obtained.
AIR CLEANER AND INTAKE SILENCER
The air taken into the carburetor to mix with the fu el is
thoroughly cleaned in passing through the combined air cleaner
and flame arrester mounted on the top of the carburetor at the
air intake (Fig. 28) .
Cleaning of the air is accomplished by a gauze element,
through which the incoming air passes, depositing the particles
of dust, dirt andgtiton the
oil-covered edges. This element
also quenches any flame that
may be caused by backfire
through the carburetor . .
Under ordinary condi-
tions, where the car is driven
·on pavement or surfaced
roads, the air cleaner should
be removed every 2,000 miles
and the dirt that has collected
on . the gauze element cleaned
out. This is done by removing
Fig. 28-Air Cleaner
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