88 ENGINE 273 MPFI 8. Refill the weighed oil into the oil sump. Do not spill any oil. The vessel used for draining should not be used for any other purposes. 9. Drive the vehicle approx. 200-300 km/125-185 miles. This drive should include at least 30-40 kms/ 20-25 miles of highway or similar road, vehicle running at about 60 kmph/ 40mph. Let this drive distance be ‘D’ miles. 10. Immediately after the test drive, place the vehicle at the same spot from where it started. 11. Place the same previously used vessel below the oil sump, unscrew the drain plug and drain off oil into the vessel. Drain the sump fully. 12. Weigh the vessel along with oil, now for the second time. Let this weight be ‘w2’ gms. 13. Find out standard oil consumption using following formulae C = (w1 – w2) / (0.88 X D) Where, C =Actual oil consumption (Litres per 1000 km) w1 = Wt. of oil vessel before drive (Miles) w2 = Wt. of oil vessel after drive (Miles) D = Drive distance in miles 3. Extremely Low Engine Oil Pressure: Before calculating oil pressure, check the following parameters: a. External leakages. b. Oil level in sump up to maximummark on dipstick. c. Oil pressure transducer for proper functioning. d. Oil pump performance using a suitable pressure gauge. Oil pressure found to be less than 2.8 bar at maximum speed and 1.2 bar at idling speed, may be due to improper functioning of oil pump. e. Ensure that correct grade of engine oil is used. If low oil pressure is not on account of above factors, wear of journals/bearings is indicated for which overhaul of engine is recommended. Procedure for checking oil pressure CAUTION Before conducting the test ensure that engine oil level is at high mark on dipstick, otherwise top up. No leakage. Correct grade of engine oil is used. 1. Remove electrical connection from oil pressure transducer (switch). 2. Remove oil pressure transducer (switch) from cylinder head. 3. Install Oil pressure gauge in place of oil pressure transducer. 4. Start engine and warm it up to normal operating temperature. 5. Warm up the engine and measure oil pressure. It should be within specified limits. 6. After checking oil pressure, stop engine and remove oil pressure gauge. 7. Before reinstalling oil pressure transducer, be sure to apply sealant on screw threads and tighten transducer to specified torque. 4. Mechanical Failures: Metallic knocking sound from an engine may be due to faulty ignition, excessive clearance in main and big end bearings, small end bush, tappets, piston slap, seized of piston rings, scored cylinder bore or breakage of any moving parts. Defective alternator can also be a source of mechanical noise. Defect can be located by replacing alternator or AC compressor (if fitted) or belt tensioner pulley with a new one. Engine Oil Pressure with 70°CCoolant Temperature At Idle Speed (800 rpm) 1 bar At Max. Speed (5250 rpm) 4 bar
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