Chevrolet Light Operator's Manual page 27

per minute.
If necessary readjust
idling mixture screw "A" as
explained above
to
obtain a smooth idle.
Maintenance - Updraft Carburetor.
Warm up engine
to
normal operating
temperature and make sure choke
and throttle knobs are in aU the way.
Adjust the engine speed to 450 to 500
revolutions per minute by turning
the throttle stop screw "B" in or out
as desired (fig. 28).
Turn the idle mixture adjusting
screw "A" in or out as necessary to
provide a smooth idling
mixture. If
the carburetor is in good condition
the best idling mixture should be ob-
tained with the idling mixture screw
between lh and Ilh turns open.
Air Cleaner
Fig. 28-Upd"./t Ca,bIJ,eto,
wit" Gover/lot
Description-Standard C leaner. AU air taken into the carbure-
tor to mix with the fuel passes through the combined air
cleaner and flame arrestor mo·unted on the carburetor at the
air intake. Dust, dirt and other foreign material that would
otherwise be taken into the engine is trapped in an oil damp-
ened filter element in the air cleaner. This 'filter element acts
as a flame arrestor in case of engine backfire.
Description-Heavy Duty Cleaner. A heavy duty air cleaner of
the oil bath type is used on all 2 Ton vehicles. In certain sections
of the country o~
under certain operating conditions where an
unusual amount of dirt is encountered this air cleaner, which
is interchangeable with the regular cleaner, may be had as
special equipment on other truck models or purchased through
parts service. This cleaner will not affect the power or economy
of the engine in any way.
The heavy duty cleaner "first takes the incoming air down
over a pool of oil where most heavy particles of dirt are de-
posited and then up through an oil moistened filter element to
complete the cleaning job.
Care. Keep the air cleaner cover wing nut and the cleaner to
carburetor clamp screw tight.
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