TIAGO TIGOR CNG - SERVICE MANUAL

1.2L REVOTRON Bi FUEL CNG ENGINE 56 caused by excess fuel from a leaking fuel injector, sticking idle speed control valve, or a clogged air filter. Replace the spark plugs if carbon fouled. 3. Oil Fouling- Heavy wet deposits indicate the spark plug is oil fouled. Oil fouling occurs when engine oil is entering the combustion chamber from defective piston rings, valve guides or seals, or a blown head gasket. May also occur during run-in/break In on new or overhauled engines. Replace the spark plugs if oil fouled. 4. Overheating- Overheating is typically caused by the over-advancement of ignition timing, a lean fuel mixture, incorrect spark plug heat range, or incorrect fuel octane rating. Electrodes and insulator will be white and may show signs of wear. Replace overheated spark plugs. 5. Detonation - A detonation or pre-ignition condition will look the similar to an overheating condition, but wear and damage will be much worse such as insulator cracking or breaking. Typically caused by the wrong grade of fuel, incorrect spark plug heat range, or an extremely lean condition. The problem must be identified and repaired immediately otherwise severe engine damage will occur. Do not reuse broken or cracked spark plugs. V. Air Conditioner Compressor and Alternator Belt Replacement : The belt used in this vehicle is multi ribbed belt. This belt is pre-tensioned over Air conditioner compressor and crank shaft pulley and therefore do not require the tensioner as this is capable of efficient power transmission. CAUTION  The belt is not interchangeable and should not be interchanged with normal multi- ribbed belts.  Removal : 1. Rotate the tensioner point by using ring spanner opposite to belt tension and remove the belt.  Installation : 1. Install the new belt on AC Compressor alternator and then on water pump pulley. 2. Rotate the tensioner point by using ring spanner opposite to belt tension and install the belt with the help of clevis meter measure the proper belt tension. CAUTION  Ensure that the tool is correctly located during the belt fitment process. Make sure that while rotating the crank shaft pulley the belt should not slip away from AC Compressor pulley.