Section 3 CARBURETION

TM 5-4240-501-14P CARBURETION Air Cleaners Section 3 CARBURETION AIR CLEANERS A properly serviced air cleaner protects the internal parts of the engine from dust particles in the air. If the air cleaner instructions are not carefully followed, the dirt and dust which should be collected in the cleaner, will be drawn into the engine and become a part of the oil film, which is very detrimental to engine life; dirt in the oil forms an abrasive mixture which wears the moving parts, instead of protecting them. No engine can stand up under the grinding action which takes place when this occurs. The air cleaner on every engine brought in for a check up or repair should be examined and serviced. If the cleaner shows signs of neglect, show it to the customer before cleaning, and instruct him on proper care to assure long engine life. NOTE: Replace air cleaner gaskets and mounting gaskets that are worn or damaged, to prevent dirt and dust entering engine through improper sealing. Straighten or replace bent mounting studs. Service Oil Foam Air Cleaner Clean and re-oil air cleaner element every 25 hours or at three month intervals under normal conditions. The capacity of the "Oil Foam" air cleaner is adequate for a full season’s use without cleaning in average homeowner lawn mower service. (Clean every few hours under extremely dusty conditions. See Figures 1 and 2 Fig. 1 - Oil Foam Air Cleaner Fig. 2 - Oil Foam Air Cleaner OIL FOAM AIR CLEANER (Figs. 1 and 2) 1. Remove screw or wing nut. 2. Remove air cleaner carefully to prevent dirt from entering carburetor. 3. Take air cleaner apart and clean. a. WASH foam element in kerosene or liquid detergent and water to remove dirt. b. Wrap foam in cloth and squeeze dry. c. Saturate foam with engine oil. Squeeze to remove excess oil. 4. Reassemble parts and fasten to carburetor securely with screw or wing nut. Fig. 3 - Cleaning Air Cleaner DECEMBER, 1980 3 1