Engine Rebuilding Techniques & Procedures 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 Engine Rebuilding Techniques & Procedures flashcards as text
What is the recommended honing angle (crosshatch pattern) for most cylinder bores to achieve proper ring seating?
Answer: 45–60 degrees included angle
A crosshatch angle of 45–60 degrees (included) provides the correct oil retention and ring-seating characteristics for most applications.
What does 'deck height' refer to in engine rebuilding?
Answer: Distance from crank centerline to block deck surface
Deck height is the distance from the crankshaft centerline to the top (deck) surface of the block, a critical dimension for compression ratio and gasket selection.
Which condition requires replacement rather than reconditioning of a crankshaft?
Answer: Cracks detected by magnetic particle inspection
Cracks discovered by magnetic particle or dye penetrant inspection are cause for crankshaft rejection; cracked cranks cannot be safely reconditioned.
When installing camshaft bearings, what alignment is critical?
Answer: Oil hole in bearing must align with oil passage in block
The oil feed hole in each camshaft bearing must align precisely with the corresponding oil passage in the block to ensure proper lubrication.
What is 'bearing crush' and why is it important?
Answer: The amount bearing shell extends beyond the housing bore to create interference fit
Bearing crush is the slight protrusion of each bearing half beyond the housing parting face; when the cap is torqued, this interference locks the bearing in place and improves heat transfer.
Which tool is used to measure piston ring end gap?
Answer: Feeler gauge with ring positioned squarely in the bore
Ring end gap is measured by placing the ring squarely in the cylinder bore at the wear limit and measuring the gap with a feeler gauge.
During engine assembly, why must all oil passages be verified clear before installation?
Answer: To prevent metal debris from starving bearings of oil and causing immediate failure
Any blockage in an oil passage will starve downstream bearings of lubrication, leading to seizure within seconds of startup.