4A Z2 EMISSIDN l30IlTIl0LS EXllAlI T SYSTEIllS VI Six Uyllnrlor V B A polyurethane foam PCV air inlet filter is located in a filter retainer in the air cleaner The retainer A polyurethane foam PCV air inlet filter is located must be rotated to remove it from the air cleaner fig in the sealed oil filler cap To clean the filter apply 4A 24 The filter must be cleaned in kerosene at the light air pressure in reverse direction of normal flow mileage intervals recommended in the Mechanical that is through the filler tube opening of the cap Maintenance Schedule After cleaning the filter Lightly oil the filter with clean engine oil If the filter should be lightly oiled with clean engine oil is deteriorated the filler cap must be replaced SIX CYLINDER ENGINE pulls the air valve down This allows cooler air from the engine compartment to enter the air cleaner This system consists of a two piece heat shroud When the temperature of the ai reaches l30 F the positioned on the exhaust manifold a hot air hose air valve is in the open position heat off so that only and an air duct and valve assembly which is located in engine compartment air is allowed to enter the air the air cleaner snorkel fig 4A 25 cleaner The air duct and valve assembly incorporates an air valve a thermostat unit and a spring A The temperature of the air entering the air cleaner Ac p m g x gy m r is thermostatically controlled by the air duct and 1 R I to h lf d valve assembly Air from the engine compartment or k I gave me river p al is lmmtgse Bl l heated air from the shrouded exhaust manifold is sup cgvezzdce watel me mg certain ermos um ls plied to the engine The thermostat unit in the air duct is exposed to in 2 Place ahel e l e er m wT e1i md ebeerve the coming air The spring loaded air valve is connected to temperature W le eating water S w Y the thermostat unit through linltage The spring holds NOTE with water temperature at 105oF Or less arr the air valve in the closed position heat on until the valve must be in closed heat Orr p0sm0n thermostat unit overcomes the spring tension During the engine warmup period when the air 3 Heat water until temperature reaches 130 F temperature entering the air duct is less than l05 F air valve must be in fully open heat off position the thermostat is in the retracted position and the air valve is held in the closed position heat on by the NOTE lf air valve does not open and close at tem spring thus shutting off the air from the engine com peratures specified check valve mechanism for a bind partment Air is then drawn from the shroud at the ing conditizm or it disconnected or defective spring lf exhaust manifold valve mechanism is in satisfuxztmry cmuiitizm ther As the temperature of the air passing the ther moslat unit is defective and air cleaner assembly must mostat unit rises the thermostat starts to open and be replaced f ZL S E J5 o 1l 3X 3 N 0 6 vn el lll Q eJ III J A I To menmosrn THERMOSTAT uurr exrennen ENGINE umr RETRADTED MEM ED Am i PAHTMENT Fly M25 HC Syst m Slx Byllnder