E. EXHAUST SYSTEM REMOVAL MAINTENANCE PRECAUTIONS At every interval of periodic maintenance service and when vehicle is raised for other service, check exhaust system as follows: Check rubber hanger mountings for damage, • deterioration or out of position. Keep sufficient clearance between exhaust • system component and underbody. Check exhaust system for leakage, loose • connection, dent & damage. If bolts or nuts are loosened, tighten them to the specified torque. Check nearby body areas for damage, missing • or mis-positioned part, open seam, hole, loose connection or any other defect which could permit exhaust fumes to seep into vehicle. Make sure that exhaust system components • have enough clearance from underbody to avoid overheating and possible damage to floor carpet. Any defects should be fixed at once. • PRECAUTIONS FOR CATALYTIC CONVERTER In the event of following symptoms, drive the vehicle at slow speed without rapid acceleration. Engine misfires or runs irregularly, following a • cold start. A significant loss of power is noticed. • In case MIL lamp remains ON even after engine • has been started. If the vehicle continuously runs with misfiring, it • may cause overheating of shell, carpet etc. resulting into fire. MAINTENANCE OF CLOSED COUPLED CATALYTIC CONVERTER Closed Coupled Catalytic Converter should be flushed by giving full throttle (4 to 5 times) in standing condition of vehicle on daily basis. In addition to this it is recommended to run the vehicle at high speeds (80 to 100 kmph) for few km as this will help to flush the carbon soot deposits from exhaust system and closed coupled catalytic converter. High speed running of the vehicle may be done periodically to avoid chocking of Closed Coupled Catalytic Converter. Alternative method for flushing operation for cleaning the catalytic converter is by directing dry compressed air draft (3 to 4 bar) in the direction of catalytic converter inlet, after removing it from the vehicle. AVOID Push start or tow-starting the vehicle. (Use • jump leads). Long (not more than 10 seconds) repeat (not • more than 3 times) starting of the vehicle. Investigate the cause for difficulty in starting and rectify the same. Long idling (to warm-up) if the engine is running • rough, after a cold start. Switching “OFF” the ignition when driving down • the hill. Fuel almost empty. • Pre- Coating/Painting of Catalytic Converter • WARNING To avoid the danger of being burned, do not • touch exhaust system when the system is hot. Any service on the exhaust system should be performed when the system is cool. WARNING Avoid parking of vehicle over inflammable • materials, such as dry leaves; grass etc. as exhaust system is hot enough to initiate fire. Petrol Engine Ph-2 (CAFÉ) 105
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