TIAGO

1.05L REVOTORQ ENGINE 47 iii. Extremely Low Engine Oil Pressure Check the following:  External leakages.  Oil level in sump up to maximum mark on dipstick / Check oil level.  Oil pressure switch / indicator for proper functioning.  Functioning of pressure relief valve on oil pump.  Oil pumps performance using a suitable pressure gauge. If low oil pressure is not on account of above factors, wear of journals/bearings is indicated for which overhaul of engine may be considered.  Leakage through oil pumps back plate. iv. Mechanical Failures Defective water pump, idler tensioner, damaged turbocharger, engine mounts or alternator can be a source of mechanical noise. Defect can be located by replacing alternator, water pump, engine mounts, and idler tensioner with a new one. Metallic knocking sound from an engine may be due to faulty injectors, excessive clearance in main and big end bearings, small end bush, tappets, piston slap, seizing of piston rings, scored cylinder bore or breakage of any moving parts. Overhauling of fuel system will set right Diesel Knock. Dismantling of engine may be considered if still noise occurs even after attending all above mentioned problems. Check for EMS problems if any.