F2 EXHAUST EMISSION CONTROL SYSTEMS Q g 9 O N eee O gg YG ia m ig J KW A O 7 7 mea B ea e Ai L A I yw wM M V Ig t VIEW A We Wn Z ff an 2 VW I EEEO I x Qi Q 5 X I w i AMS se E atm if y fl is I SJ Ewflll fo T I SB I m A U if gg w E7 6 5 I E iv 4 xi I A fi ii x fw 9 r s C I g J yi ei O 6 O L O J5 a Q Q D V Fl 0 view B 3 12772 FIG F2 1 DAUNTLESS v 6 ENGINE EXHAUST EMISSION CONTROL SYSTEM EARLY MODEL A Top Rear of Engine 4 Check Valve uide of Engine ziiige Assy Left Side 2 Air Filtei 7 Di tributionOTube Assy Right Side 3 Anti Backfire Valve 8 Relief Valve Muffler bi metal temperature sensing spring starts to Open See Fig F2 4 This is because the air bleed valve a valve to bleed more air into the vacuum line in the sensor is closed so that full manifold vacuum whenever the temperature in the air cleaner rises is applied in the vacuum motor The cold air door above about 1 15 F 46 C Whenever the tem will remain tightly closed only a few minutes how perature falls below about l15 F 46 C the ever As soon as the air cleaner starts receiving sensing spring starts to close the air bleed into the hot air from the heat stove the sensor will cause vacuum line allowing more manifold vacuum to the cold air door to open partially mixing cold air reach the vacuum motor Whenever there is 9 with the hot air as necessary to regulate air cleaner inches 22 8 cm or more of vacuum in the vacuum temperature within 20 of the ideal 1 l5 F 46 C motor the diaphragm spring is compressed the air inlet temperature See Fig F2 5 cold air door is closed and the hot air door is If underhood air temperature rises to l35 F opened 57 C the air to the vacuum bleed valve in the When the engine is not running the diaphragm sensor will be wide open so that vacuum motor spring will always hold the cold air door open and approaches zero The diaphragm spring in the vac the hot air door closed However when the engine uum motor will hold the cold air door wide open is running the position of the doors depends on the and close the hot air door tightly If underhood air temperature in the air cleaner temperature rises above 135 F 570 C car When starting a cold engine air cleaner tempera buretor inlet air temperature will also rise above ture under 95 F 35 C the cold air door will 135 F 57 C close and the hot air door will open immediately While air cleaner temperature is being regulated 150