F2 EXHAUST EMISSION CONTROL SYSTEMS the throttle stop screw to idle the engine at 650 To check the pump for proper operation remove to 700 rpm the air outlet hose at the pump With the engine running air discharge should be felt at one of F2 17 Carburetor Idle Setting the Pump putlpt qpphipgs Tl1e PumP eutlet elf The Lean Best Idlea Method Of Idle Setting is as pressure as determined by the relief valve is preset follows and 1S not adjustable a An ch d led servic ofi nition s st should The elepemp reel eever esSembly heuemg the PY C Cl Sth Lddjustmeni g y em Ie 2l 135 lH d1 cf 1a g1eyt1 li eri par d Htll i b Connect tacllemeter to ellgllle recommended for service replacement These parts Wefm uP euglue and Stablllze temPel etuYes are to be replaced only when damaged as a result cl Adjust engine idle to speed desired using throt of handling or in the event the relief valve was tle idle speed adjusting screw tampered with e Turn idle mixture screws out counterclockwise until a loss of engine speed is indicated then F2 22 Intake Manifold slowly turn mixture screws in clockwise leaner until maximum Speed rpm is reached Continue Intake manifoldlleaks musttnot be overlooked Air turning in clockwise until speed begins to drop leakage at the llltelee melllfeld may hp e mpell turn mixture adjustment back out counterclock Salad lol by llcher ldle mlxmre Spthpgi hclweeerv Wiseqieher until maximum Speed is just regained this will usually cause uneven fuel air distribution at a lean as possible mixture adjustment ang Wlgl always regu lfl ess gl e lOllllel eekalld ex aus emission con ro o c ec or air ea age F2 I8 D b into the intake manifold apply kerosene or naph ls U tha on the intake manifold to cylinder head joints The ignition distributor used with the Exhaust and observe whether any changes in engine rpm Emission Control System IS the same as that used occur If an air leak is indicated check the mani on engines without Exhaust Emission Control fold to cylinder head bolt tor ue The correct Cl Check the distributor cam dwell angle and point torque is 25 35 lbs ft 3 46 a 4 84 kg m If the condition Check ignition timing and adjust to leak is still evident loosen the manifold assembly specifications shown on the last page of this section and torque tighten the bolts evenly Start from the center and use proper torque values Replace the F2 g Amggackfire valve manifold gesket if the leak itill exists Clean both The anti backfire valve remains closed except when lieetlilggur eeee phd eheek ele beers er ether ll the throttle is closed rapidly from an open position ilgu em ee 1 To check the valve for proper operation accelerate t sveye tel que the be is evenly te the speelfled the engine in neutral allowing the throttle to close e que ve ee e prevee werpege rapidly The valve is operating satisfactorily when no exhaust system backfire occurs A further check F2 23 Carburetor Air Cleaner Oil Bath to determine whether the valve is functioning can Every 6 000 miles 9 600 km disconnect attach be made by removing from the anti backfire valve ing hoses and unscrew the wing nut from the tcp the large hpsp wh h pphhppts the Valvp te the of the aa cleaner and mr at air the carburetor pump Whh a hppa plappd pvpf the ppp pp l pf Lift tha cover and ima element arr tha an samp the hppa pt the v h p appphaatp thp phphp ap Clean the inside surface ar the sump and refill to ahpw the thwtup tp plpsp hap hy The Valve is indicated oil level with sae 40 or s0 engine dd gg f ti i a t lY ll a m m t fY au mshmg above 32 F sAF 20 below 32 F wash mai element in kerosene and drain Reassemble the air cleaner and install on carburetor F2 20 Check ValVe More frequent cleaning and replacement are advis The check valves in the lines to the air distribution able when the car is operated in dusty areas or on manifolds prevent the reverse flow of exhaust gases unpaved roads Accumulated dirt restricts air flow to the pump in the event the pump should for reducing fuel economy and performance any reason become inoperative or should exhaust pressure ever exceed pump pressure To check this valve for proper operation remove E2 24 REMOVAL R E E the air supply hppa from the pump at the check The fplipwmg paragraphs give the prpcpduras far valve With the engine running listen for exhaust l em Vmg the meJ l units af the exhaust emlssltm leakage at the check valve which is connected to C tY l System and the required equlpmeut needed the distribution manifold F2 25 Air Pump F2 2l Air PUmP Loosen the air pump mounting bracket bolts Re Check for proper drive belt tension with belt tension move the air pump air hose s Separate the air gauge W 283 The belt strand tension should be pump from its mounting bracket At time of install 60 pounds measured on the longest accessible span ation torque tighten the air pump mounting bolts between two pulleys DO NOT PRY ON THE to 30 40 lbs ft 4 15 a 5 53 kg m Adjust the DIE CAST PUMP HOUSING belt strand tension to 60 pounds 156