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Before adjusting idling speed make sure hand throttle knob
and choke knob are pushed in all the way and accelerator and
throttle linkage is free so that throttle lever stop screw "B"
(fig. 31) is against
stop.
Turn screw "B" in or out to obtain an
idling speed of 450 to 500 RPM. If necessary readjust idling
mixture screw "A" as explained above to obtain a smooth idle.
On automatic transmission models, adjust to idle speed of
400-450 RPM with shift lever in "N" position.
Maintenance-Updraft Carburetor. Warm up engine to normal
operating temperature and make sure choke and throttle
knobs are in all the way. Adjust the
engine speed to
·
450 to 500 RPM on
conventional
transmission
models
and 400-450 RPM with shift lever in
"N" on
~ydra-Matic
models by turn-
ing the throttle stop screw "B" in
or out as desired (fig. 34).
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
¥2
and 1% turns open.
Fig. 34-Updraft
Carburetor
with Governor
Maintenance-Eight Cylinder Model Carburetor. Warm up en-
gine to normal operating temperature and make sure choke
and throttle knobs are in all the way. Connect tachometer and
vacuum gauge and adjust idle speed to give 475 RPM. Adjust
each idle mixture screw separately to give peak vacuum and
RPM indications on tachometer and vacuum
gauge.
CAUTION: Do
not
turn idle mixture screws tightly against stop
or damage to needle seat will result.
If necessary, readjust engine idle to 475 RPM and readjust
idle mixture.
Air Cleaner
Oil bath cleaners on all truck models operate primarily to
remove dust and dirt from the air before it is taken into the
carburetor and
engine.
All air cleaners used incorporate flame
arresters.
Maintenance-The oil level in the air cleaner reservoir should
be checked at regular intervals and sufficient S.A.E. 50 oil
• 27 •
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