Engine Maintenance and Modification Bradley Artigue
FIAT 124 Spider Engine Maintenance + Modification - Artigue.com
FIAT 124 Spider Engine Maintenance + Modification - Artigue.com
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FIAT 124 Spider<br />
<strong>Engine</strong> <strong>Maintenance</strong> + <strong>Modification</strong><br />
Should the accelerator be depressed when the choke is included, the screw (61) would<br />
disengage the cam (60) which drawn by spring (63) would reduce the opening of primary<br />
throttle (23).<br />
The engine cooling-water warms up, <strong>and</strong>, circulating in the cover (70) heats the bimetallic<br />
coil (58) which will make the lever (67) turn <strong>and</strong> through the above mentioned linkage<br />
system, will cause the progressive opening of choke plate (59). During rotation of<br />
primary throttle (23), the cam lever (60) will also rotate thus excluding progressively the<br />
choke.<br />
Once running temperature is reached, the choke plate (59) will be in fully open position:<br />
the screw (61) is now no longer in contact with the cam (60) thus allowing primary<br />
throttle (23) to close up till to normal idling position.<br />
Figure 31: ADF Anti-Pollution Device<br />
ADF type carburetors, provided with vacuum devices to reduce air pollution, are fitted on<br />
cars equipped with electric switches that set off a special electro valve located between<br />
intake manifold <strong>and</strong> fuel inlet pipe (74).<br />
The vacuum, through pipe (74), acts on diaphragm (73) which, by means of rod (72),<br />
lever (71) <strong>and</strong> lever (53), opens primary throttle (23) to fast idle position: adjustment of<br />
throttle (23) opening is carried out through adjusting screw (75).<br />
Under such opening conditions, during motoring over, exhaust emission levels are rather<br />
low; within the air pollution tolerances. When vacuum is intercepted by the electro valve,<br />
the air sucked through duct (76), nullifies vacuum acting on diaphragm (73) <strong>and</strong> allows<br />
throttle (23) to return to normal idling position.<br />
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