ENGINE OIL CONSUMPTION TEST : II. Description : Before performing a complete overhaul or major repair of an engine due to oil loss, first determine whether the overhaul is necessary. Locate the cause of the oil loss by searching for external leaks and internal combustion problems. Check engine oil consumption to make certain the amount of oil lost is greater than normal engine oil consumption. Determine engine oil consumption by measuring the weight or volume of oil, driving a predetermined distance, and then measuring the oil again. Determining oil loss by means of visually checking oil level on the dipstick is inaccurate. Test Procedure : • 1. Park the vehicle on a flat, level surface and engage the parking brake. 2. Inspect the engine thoroughly for signs of external leaks through the cylinder head cover gasket, crankshaft main seals, Crank sensor, oil sump gasket, oil pump, oil sump drain plug, etc. Repair any external leaks. 3. If an external leak is not found, fill the engine oil sump to capacity so the oil level reading on the sump dipstick is at the ‘MAX’ mark. 4. Warm the engine so oil temperature is approximately 750- 800 C and then stop and soak for few minutes. 5. Place a clean suitable container to empty the engine oil. Use a scale to determine the weight of the empty container. Record the tare weight. 6. Completely drain the engine oil into the container. 7. Replace and tighten the oil pump drain plug. 8. Weigh the engine oil, drained into the pan (W1). 9. Refill the engine crankcase sump with the weighed oil. Use care not to spill any oil as this will make the test inaccurate. Do not use the container for any other 10. purpose. Drive the vehicle for approximately 200 or 300 11. km. A minimum of 30 - 40 km should be on a highway or other road where a speed of 60 km/h can be maintained. Record the distance travelled (D). Return the vehicle to the exact location the oil 12. was previously drained from the engine. Wait for few minutes to cool down the oil. 13. Drain the oil from the engine into the container 14. used to originally weigh the oil. Allow the oil to drain completely and use care not to spill any oil, as this will adversely affect the test results. Weigh and record the weight of the oil (W2). 15. Calculate and compare oil consumption. 16. a. Determine the amount of oil consumed (W3) by subtracting the weight of oil after the drive from the original oil weight (W1W2). b. Divide the oil consumed by the specific gravity of oil to determine the volume of oil consumed, in milliliters (W310.88=C ml) c. Divide the volume of oil consumed by the distance traveled to determine the volume of oil consumed per kilometer (C ml by D). d. Multiply by 1000 to determine the amount of oil consumed every 1000 km. e. Compare the actual oil consumed with the standard oil consumption. NOTE Using a weight, grade, or brand of engine oil other than recommended by TATA Motors may increase engine oil consumption and/or promote engine wear. CALCULATION W1 - W2 = W3 Divide W3 by 0.88 gm/cm3 = Caml Divide Ca ml by D Multiply by 1000 Solution Milliliters consumed per 1000 km 1.2L REVOTRON PHASE-2 ENGINE 42
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