TIAGO TIGOR CNG - SERVICE MANUAL

1.2L REVOTRON Bi FUEL CNG ENGINE 114 G. CNG FUEL SYSTEM GENERAL PRECAUTIONS TO BE TAKEN WHILE DISMANTLING / WORKING ON CNG SYSTEM 1. Ensure that there is no source of spark, cigarettes or open flame near the vehicle during dismantling of CNG System. 2. Ensure that working area is well ventilated. 3. Always use personal protective equipment while removing and refitment. 4. Ensure that suitable fire extinguishers are available while working. 5. Close the manual valve on the cylinder valve and run the engine at idle till the CNG in the fuel lines is consumed. Wait for the engine to cool down. 6. Remove Battery Terminal. 7. While Removing CNG components use proper protective gloves. 8. Spilt Coolant should always be wiped away immediately. 9. Then start removal procedure of desired fuel system component. DO’S AND DON’TS DO’S 1. Always Inspect joints etc. under pressure for leaks and proper installation after re-installation. 2. Ensure tubing is bottomed on Fitting body before re-tightening. 3. Always consume gas in the lines by running the engine on gas until the gas is consumed by closing cylinder valve manual tap before servicing working on any CNG components. 4. Ensure that mating components threads are of same standards. 5. Tighten all the connectors as per the instruction of fitting manufacturer. 6. Always check cylinder and cylinder valve alignment. DON’TS 1. Never loosen any Component when system is pressurized. 2. Do not tighten taper threads without Teflon tape. 3. Do not put excessive weight or lean on tubing.  CYLINDER REMOVAL (FOR TIAGO) 1. Close the CNG shutoff valve at the cylinder. Start the vehicle and keep running to empty the CNG fuel from the system. 2. Disconnect the battery cable. 3. Loosen the top clamp and slide down the collapsible hoses. 4. Slowly loosen the nut on both side of the cylinder valve which connects the high pressure line to the stainless steel connectors on the cylinder valve. CAUTION Perform carefully as there may be residual pressure in the high pressure line which could get relieved during this operation. 5. Pull the high pressure lines gently away from the cylinder valve on both sides. 6. Loosen and remove the nuts holding the cylinder straps. Swivel the straps about its hinges.