Engine Repair Midterm Questions and Answers Latest Version Already Passed

Engine Repair Midterm Questions and Answers Latest Version Already Passed What is the most likely cause of a knocking noise in the lower part of the engine during acceleration? Worn connecting rod bearings What tool is commonly used to check cylinder bore wear and taper? Dial bore gauge What is a common symptom of a blown head gasket between two cylinders? Loss of compression in both cylinders and rough running What does a grayish-white spark plug tip usually indicate? Normal combustion What engine component regulates oil pressure? Oil pressure relief valve 2 What is the main purpose of a harmonic balancer? To absorb crankshaft vibrations What would cause excessive oil consumption without external leaks? Worn valve guide seals or piston rings Why is it important to stagger piston ring end gaps during installation? To prevent blow-by and loss of compression What is the function of an engine's PCV (Positive Crankcase Ventilation) system? To remove blow-by gases from the crankcase and reduce emissions What happens if a timing belt is installed one tooth off? The engine will run poorly or not start at all Why should valve lash be adjusted to manufacturer specifications? To ensure proper valve timing and reduce engine wear 3 What could cause a high reading on a cylinder leak-down test? Worn or damaged piston rings, valves, or head gasket What does excessive end play in a crankshaft usually indicate? Worn thrust bearings What could a milky white color in the engine oil indicate? Coolant contamination from a failed head gasket or cracked head Why must the torque sequence be followed when installing a cylinder head? To prevent warping or uneven stress on the head What would cause blue smoke from the tailpipe during engine startup? Oil leaking past the valve seals What is the main function of the oil pump in an engine? To circulate lubricating oil under pressure to moving engine parts 4 What test can help identify a faulty intake or exhaust valve without removing the cylinder head? Cylinder leak-down test Why is a compression test performed on an engine? To determine the sealing ability of the piston