HEXA

ENGINE 39 11. Immediately after the test drive, place the vehicle at the same spot from where it started. 12. Place the same previously used vessel below the Oil sump. 13. Unscrew the drain plug and drain off oil into the vessel. Drain the sump fully. 14. Weigh the vessel along with oil, now for the second time. Let this weight be ‘w2’ gms. Find out standard oil consumption as follows: If the engine oil consumption is more than 0.2 liter per 1000 kilometers then it can be treated as high engine oil consumption and the engine can be taken for further investigation. 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, air lock in HLA, 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.