TM 5-4240-501-14PCARBURETIONAir CleanersSection 3CARBURETIONAIR CLEANERSA properly serviced air cleaner protects the internal partsof the engine from dust particles in the air. If the aircleaner instructions are not carefully followed, the dirtand dust which should be collected in the cleaner, will bedrawn into the engine and become a part of the oil film,which is very detrimental to engine life; dirt in the oilforms an abrasive mixture which wears the moving parts,instead of protecting them. No engine can stand upunder the grinding action which takes place when thisoccurs. The air cleaner on every engine brought in for acheck up or repair should be examined and serviced. Ifthe cleaner shows signs of neglect, show it to thecustomer before cleaning, and instruct him on propercare to assure long engine life.NOTE: Replace air cleaner gaskets and mountinggaskets that are worn or damaged, to prevent dirt anddust entering engine through improper sealing.Straighten or replace bent mounting studs.Service Oil Foam Air CleanerClean and re-oil air cleaner element every 25 hours or atthree month intervals under normal conditions. Thecapacity of the "Oil Foam" air cleaner is adequate for afull season’s use without cleaning in average homeownerlawn mower service. (Clean every few hours underextremely dusty conditions. See Figures 1 and 2Fig. 1 - Oil Foam Air CleanerFig. 2 - Oil Foam Air CleanerOIL FOAM AIR CLEANER (Figs. 1 and 2)1. Remove screw or wing nut.2. Remove air cleaner carefully to prevent dirt fromentering carburetor.3. Take air cleaner apart and clean.a. WASH foam element in kerosene orliquid detergent and water to removedirt.b. Wrap foam in cloth and squeeze dry.c. Saturate foam with engine oil. Squeezeto remove excess oil.4. Reassemble parts and fasten tocarburetor securely with screw or wingnut.Fig. 3 - Cleaning Air CleanerDECEMBER, 198031
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