NEXON

1.5L REVOTORQ ENGINE 47 1.4 ENGINE TESTS AND MAINTENANCE A. PRELIMINARY INSPECTION NOTE  It is always advisable to first use the diagnostic tool and rectify the electrical faults, before commencing with mechanical repairs/ troubleshooting. Refer ENGINE MANAGEMENT SYSTEM section in this group for procedure.  General  Check for leakage of Oil, fuel, and Coolant.  Check for overheating of engine.  Check for unusual smoke.  If there is any fault in the Engine Management system (EMS) then the MIL indicator in the instrument cluster will come ON. In such a case connect the diagnostic tester. (For procedure refer EMS section). Before proceeding to carry out actual reconditioning of engine, it is desirable to have a preliminary inspection of engine to ascertain whether an engine reconditioning is necessary and if so, to what extent. Most common reasons for which engine is reconditioned are 1. Loss of power. 2. Excessive engine oil consumption. 3. Extremely low engine oil pressure. 4. Mechanical failures. B. ENGINE TESTS i. Loss Of Power Loss of engine power may be due to a. EMS is in limp-home mode due to some critical fault. b. Clogged air filter / clogged intercooler fins /loss of charge air pressure / choked exhaust passage / Closed Coupled Catcon (CCC). c. Loss of engine compression d. Defective fuel system e. Clutch slippage f. Brake binding g. Turbocharger a. EMS is in limp-home mode If the EMS detects some major fault in the system it switches to limp-home mode, where it runs at a reduced torque. Connect the diagnostic tester and check if any faults are present in the Engine EMS, if found rectify them. (For details refer Engine Management Section) b. Clogged Air filter/Loss of Charge Air Pressure/ Choked Exhaust Silencer / Closed Coupled Catcon (CCC) Loss of power with unusual black smoke from engine exhaust indicates lack of air or low air charging pressure to engine cylinders. Clean air filter & inter cooler fins. Check all joints for air leakage. If power loss with black smoke is still felt, check exhaust silencer for choking. Clean and replace silencer if necessary. Check for kink formation in exhaust piping. c. Checking Engine Compression Pressure  If loss of power is not on account of defective fuel system, lack of air, choked exhaust system, clutch slipping and brake binding, check engine compression as follows.  Warm up engine preferably by road drive to get a coolant temperature of about 80ºC. Stop the engine.  Remove the air filter.  Remove the injector back-leak pipes and high pressure pipes from rail to injector .Disconnect rail pressure sensor.  Plug the common rail outlet with suitable caps.  Remove all injectors.  Fit adapter (Part no 2871 5890 07 01 ) in place of one injector.