EMISSIDN IIDNTITULS EXHMIST SYSTEMS Ml 7 MII GUARD SYSTEM Pm Pap Alr In uI n Innmlls and Tuba 4A I1 I1Iv nnr AA 10 Alr Punp 4 4 4A 7 6 n r I 4 AA 7 mnt 5 J D vE m This system incorporates a belt driven air pump oivznrznmmw R N iE T 0N diverter bypass valve air injection maniliold s air VALVE HOSE injection tubes and connecting hoses fig 4A 1 and vacuumssusmc 4A 2 bl 5JJ3 S 22l Air is discharged from the air pump to the diverter valve which directs it to the air distribution V manifold s or dumps it through a bypass port X K g y depending on engine operating conditions Air pres E K v VE l VV 1V T sure in this system is kept to approximately 5 psi by a V V T V relief valve incorporated in the diverter valve K Tg T 4 Air is routed through the air injection manifold and r V V V l through injection tubes into the engine exhaust ports i L The air mixes with hot unburned exhaust products T Y X I and causes a further burning of the mixture reducing V i 2 hydrocarbon and carbon monoxide emissions to the at W U 3 I mosphere V T aTu M g g N K An rumiw nm ruur ef nos mvenrsn The air pump used for V 8 and six cylinder engines Dm G R 1l T is the same The major components of the air pump VALVE HOSE Mums are enclosed in a die cast aluminum housing A filter fan assembly rotor shaft and drive hub are visible on the pump exterior fig 4A 3 H ulz Mr amd Sm V 8 oivsnren vatvs MTr l gI N The pump is designed to be relatively service free L E hcggbwl The only serviceable item is the filter fan assembly It Qsoungg is not recommended that the rear housing cover be T j T removed for any reason since the internal components r it of thepump are notserviceable K T T 4 The aluminum housing has cavities for air intake F 7 F X elixir com ression and exhaust and a bore for mounting the TWAT P F front bearing The housing also includes cast metering g V F ga BNERYER TTI eas that geduce the Tioisiegf intake End comprzsxon w W ounting osses are oca on e ousing ex rior QTL V T 7 vA vE gy EE NOTE The relvef valve assembly isiincmporated in Tu VACUUM the diverter valve lf defective the dtverter valve na T SENSING sembly must be replaced T UNE The front bearing supports the rotor shaft the s T ELVE bearing is secured in position by plastic injected nos 43040 around grooves in the housing and bearing outer race The rear cover supports the vane pivot pin rear Flq 4A I Mr unl Sysltm Slx yl ml r bearing race and exhaust tube Dowel pins pressed