the long side down and the spring anchor clip away from you. Insert the plate into the air intake and hold it in position in
line with the choke shaft holes. Insert the choke shaft and lever (13) through the shaft boss and the choke plate. Rotate
the choke shaft and lever clockwise until the lock lever stop is against the stop boss. Move the choke plate to the closed
position. Hold the choke in the closed position and install the fillister head screw (7) through the eye of the choke plate
spring (8). Do not tighten this screw completely as the spring (8) should be free. Rivet the end of the screw (7), using a
flat-end punch held in a vise as a mandril to support the screw. Avoid bending the choke shaft. Then hold the choke in
open position and hook the free end of the choke plate springs (8) over the anchor clip in the choke plate (6).
k. Hold the assembled air intake body in position over the bowl, and guide the pump spring (52) into the pump guide
tube. At the same time, guide the vent and idle well (11) with the well seal washer (10) into place. Install but do not tighten
the three screws with lockwashers (9). Install the choke bracket (2) and the two screws with lockwashers (4), alining the
file marks on the choke bracket with those on the air intake body. Then tighten all five screws (4 and 9) evenly and
securely.
I. Install the venturi (42) with its small end up. Position the bowl-to-body gasket (41) on the throttle body (38),
making certain that all channel openings are in alinement. Then assemble the throttle body to the fuel bowl (45) and install
and tighten the screws with the lockwashers (43).
m. Install the carburetor (par. 78b).
Section V. SHUTTERSTAT
188. Description
The shutterstat is a thermostatic valve which controls the flow of air under pressure. Single inlet and outlet fittings
are provided for external air connections. The passage of air is controlled by a needle valve which is coupled to a
thermostat element and a liquid bulb. At normal temperature, air under pressure will pass through the needle valve.
When the temperature of the bulb approaches 180° F., the thermostat element expands to close the needle valve and cut
off the air. The needle is precision ground and lapped. The body of the shutterstat is rolled aluminum.
189. Shutterstat Adjustment
Remove the screw and lockwasher and take off the jacket from
175
