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11. Have the engine of your car tuned up by your Authorized Hudson Dealer each 5,000
miles. He will check its operation and make any necessary adjustments, including
ignition timing, contact points, spark plugs, valve adjustment and other important
details which have a direct bearing on operating economy.
The carburetors are of the dual down-draft, automatic choke type, incorporating vacuum
controlled metering rods, anti-percolator valve, accelerating pump, and fast idle features.
A filter screen is also incorporated at the fuel inlet to prevent the entrance of foreign
particles which would otherwise clog the small drilled passages and jets in the carburetor.
ADJUSTMENTS—There are no adjustments on the carburetor that will affect high
speed operation. Therefore, any servicing the carburetor may require, other than minor
adjustments that affect operation at idle speed only, should be performed by your Autho-
rized Hudson Dealer who has the special tools and gauges required to service these units.
Figure 19
reach normal operating temperature. Never make these adjustments when engine is cold.
If these adjustments do not produce satisfactory results, the engine may require an
Engine Tune-up and you should consult your Authorized Hudson Dealer.
AUTOMATIC CHOKE CONTROL—automatically proportions the fuel and air re-
quirements for both starting and engine warm-up.
The thermostatic housing spring which is contained within the thermostat housing (C), is
calibrated to hold the choke valve closed at a temperature of 75° F. when it is set at the
factory. As the engine warms up the hot air the hot air drawn into the thermostat housing
HUDSON OWNER MANUAL
CARBURETORS
IDLE MIXTURE ADJUSTMENT—This
adjustment is made by turning both idle ad-
justing screws (A). The normal position of
these screws is 1/4 to 1 turn off their seats. To
adjust them, turn both screws into their seats
and then out exactly 3/4 of turn. Readjust for
smooth idling. Turning the screws in a clock-
wise direction produces a leaner mixture and
turning them in a counter-clockwise direction
results in a richer mixture.
THROTTLE ADJUSTING SCREW (B)—
controls the engine idle speed. This screw
should be adjusted to give a speed of 7-1/2 to
8 miles per hour in high gear.
NOTE: Before making the idle Mixture and
Throttle Adjusting Screw Adjustments, be
sure the engine has been run long enough to
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