ASE T2 Domain 4: Lubrication and Cooling Systems Diagnosis and Repair Welcome to your ASE T2 Domain 4: Lubrication and Cooling Systems Diagnosis and Repair 1. ASE T2: Lubrication and Cooling Systems Diagnosis and Repair While diagnosing a diesel engine cooling system, a technician finds the coolant has a high pH level. What type of engine damage can this condition cause? A. Corrosion of aluminum parts B. Over-cooling of the engine C. Premature water pump failure D. Sediment and scale buildup None 2. ASE T2: Lubrication and Cooling Systems Diagnosis and Repair A diesel engine is experiencing premature bearing wear. A technician suspects the oil cooler might be at fault. What could be the specific cause related to the oil cooler contributing to this problem? A. Restriction in the oil cooler reducing oil flow B. Oil cooler allowing coolant to mix with the oil C. Internal leaks causing a drop in oil pressure D. Excessive cooling causing the oil to thicken None 3. ASE T2: Lubrication and Cooling Systems Diagnosis and Repair A technician notes that a diesel engine consistently runs hotter than normal, yet the coolant level and thermostat function are satisfactory. What could be the likely cause? A. Insufficient coolant flow through the radiator B. Faulty temperature sensor C. Excessive exhaust back pressure D. Radiator fins blocked by debris None 4. ASE T2: Lubrication and Cooling Systems Diagnosis and Repair During an oil change service on a diesel engine, a technician observes that the oil has a frothy appearance. What is the most likely cause? A. Oil overfilling B. Coolant contamination in the oil C. Prolonged engine idling D. Air leak on the suction side of the oil pump None 5. ASE T2: Lubrication and Cooling Systems Diagnosis and Repair When performing a cylinder cutout test, a technician finds that the engine temperature drops unexpectedly on one cylinder. What could be the reason for this phenomenon? A. Faulty injector nozzle on that cylinder B. Blown head gasket near the affected cylinder C. Clogged coolant passage near the affected cylinder D. Excessive oil consumption in the affected cylinder None 6. ASE T2: Lubrication and Cooling Systems Diagnosis and Repair A technician needs to test the operation of the oil pressure relief valve on a diesel engine. Which of the following procedures is correct? A. Measure the spring tension of the relief valve. B. Start the engine and measure the oil pressure at idle. C. Increase engine speed and observe at which pressure the valve opens. D. Use an oil pressure test gauge at the oil filter outlet. None 7. ASE T2: Lubrication and Cooling Systems Diagnosis and Repair If a diesel engine's oil pressure warning light activates immediately after an oil filter change, what should be the technician's first step? A. Check for the correct oil filter installation. B. Replace the oil pressure sensor. C. Perform an engine flush. D. Check the oil level and top off if necessary. None 8. ASE T2: Lubrication and Cooling Systems Diagnosis and Repair A diesel engine's cooling fan is continuously running at maximum speed regardless of the engine temperature. Which of the following could be defective? A. The fan clutch B. The thermostat C. The coolant temperature sensor D. The engine control module (ECM) None 9. ASE T2: Lubrication and Cooling Systems Diagnosis and Repair After replacing the water pump on a diesel engine, a technician notes that there is still an abnormal noise coming from the front of the engine. What is the NEXT best step? A. Retorque the water pump bolts. B. Check the tension on the accessory belts. C. Inspect the water pump bearings. D. Verify the alignment of the pulley system. None 10. ASE T2: Lubrication and Cooling Systems Diagnosis and Repair Which condition indicates that an engine's cooling system requires flushing? A. The presence of oil in the coolant reservoir B. A drop in the coolant level with no apparent leaks C. Discolored coolant with sediment in the system D. A consistent engine operating temperature None 1 out of 10 Time is Up! Time's up
