9. Compare the compression reading obtained for each engine cylinder. The minimum compression is 12±1 bar. If the compression reading in a cylinder is 10. below 10 bar, there may be leakage past the piston rings or valves. Squirt a several drops of oil into the cylinder bore and perform the compression test again. If the compression improves after several 11. drops of oil are squirted into the cylinder bore, the piston rings are most likely leaking. If the compression does not improve, the valves may be allowing leakage. If the compression between two adjacent 12. cylinders is below the minimum, there may be a leak in the head gasket between the cylinders. If suspecting a blown head gasket check the engine oil and coolant for signs of contamination. If coolant mixes with the oil in the sump, the oil will appear to be a dark, milky, substance. If cylinder compression is leaking into the coolant, bubbles will appear in the coolant reservoir while the engine is running. II. ENGINE OIL CONSUMPTION TEST 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 sump 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. 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. Petrol Engine Ph-2 (CAFÉ)_DCT 54
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