AUTOMATIC TEMPERATURE CONTROL (A.T.C.) AIR CLEANER AIR CLEANER FILTER Viscous paper type air cleaner filter does not require any cleaning operation until it is replaced periodically. Brushing or blasting operation will cause clogging and result in enrichment of car- buretor mixture, and should never be conducted. AUTOMATIC TEMPERATURE CONTROL SYSTEM 0 Engine stall or hesitation 0 Increase in fuel consumption O Lack of power If these phenomena should occur, check A.T.C. system before carrying out inspection of carbu- retor. 1. Check hoses for cracks, distortion and im proper position. 2. Check A.T.C. system for proper function, while engine is cold. Check air control valve position, Air control valve is correct if it is in lower position. 3. Start engine and immediately check air control valve position. If it rises, it is correct. senzae 4. Make sure that air control valve rises and lowers when engine speed is quickly increased and decreased. 5. Make sure that air control valve partially rises when engine warm-up advances. If the above test reveals any problem in the opera- tion of air control valve, carry out the following test: Inspection VACUUM MOTOR Disconnect vacuum motor inlet vacuum hose, and connect another hose to the inlet to apply vacuum to vacuum motor. Then, confirm that the air control valve moves. TEMPERATURE SENSOR While engine is cold and idling, disconnect vacu~ urn motor inlet vacuum hose and make sure that intake vacuum is present at end of vacuum hose. If vacuum is weak or is not present at all, check vacuum hoses for leakage. Replace temperature sensor if vacuum hoses are in good order. 5251295