Component Inspection & Quality Control Flashcards
7 cards from real AERA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Component Inspection & Quality Control flashcards as text
A camshaft lobe lift measurement that is below specification by more than 0.005 in indicates:
Answer: Lobe wear requiring camshaft replacement
Significant lobe lift loss means the lobe profile has worn down, reducing valve lift and engine performance, requiring camshaft replacement.
To check valve stem-to-guide clearance, a technician inserts the valve and rocks it sideways while measuring movement with a:
Answer: Dial indicator at the valve head
A dial indicator positioned at the valve head rim measures total side-to-side movement, which is then compared to the stem-to-guide clearance specification.
What does a blued (heat-discolored) zone on a crankshaft journal indicate?
Answer: Overheating from oil starvation or bearing failure
Blue discoloration on a journal indicates it reached temperatures exceeding 400°F, typically caused by oil starvation or a spun bearing, compromising the journal's hardness.
When inspecting pistons, which area is most critical to measure for diameter to determine piston-to-bore clearance?
Answer: Below the oil ring groove at 90° to the pin bore
Piston diameter is measured at the thrust face (90° to pin bore) near the skirt bottom where the piston is largest and controls bore clearance.
Dye penetrant inspection (Zyglo) is used on aluminum and non-ferrous parts because:
Answer: Non-ferrous metals cannot be magnetized for mag-flux testing
Magnetic particle inspection requires ferrous metals; dye penetrant works on any material and is therefore the NDT method of choice for aluminum castings.
When measuring piston ring gap, the ring must be squared in the bore using:
Answer: The piston itself pushed inverted into the bore
Inverting the piston and pushing the ring down with it ensures the ring sits perpendicular (squared) to the bore walls for an accurate gap measurement.
What is the correct procedure for checking camshaft bearing bore alignment in a block?
Answer: Insert a long, straight mandrel through all bearing bores and check for binding or light gaps
A precision mandrel passed through all camshaft bores simultaneously reveals misalignment if it binds or if light is visible between the mandrel and any bore.