HEXA

ENGINE 85 Maintenance : Precautions : 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. At every interval of periodic maintenance service and when vehicle is raised for other service, check exhaust system as follows:  Check rubber 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. 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 : Parking Warning : Avoid parking of vehicle over inflammable materials, such as dry leaves; grass etc. as exhaust system is hot enough to initiate fire. CAUTION :  Ensure exhaust system and catalytic converter is not blocked and is free from obstruction.  Blockages in the exhaust can create back pressure, low top speed, poor pick up, black smoke, carbon build up and low mileage.  Check if there is Excessive carbon build-up/ sticky valve.  Check and ensure EGR Valve & control system is clean and functioning properly.  Damaged vacuum lines.  The Catalytic converter should not be dropped from a height. If dropped, it should not be used. All these can keep the ‘EGR’ open when not desired and vice versa. Either way these can seriously affect power output of the engine and also the emission levels.