AERA Engine Rebuilding Techniques & Procedures 3

Question 1

What is the recommended honing angle (crosshatch pattern) for most cylinder bores to achieve proper ring seating?

Accepted Answer

45–60 degrees included angle

Answer

A crosshatch angle of 45–60 degrees (included) provides the correct oil retention and ring-seating characteristics for most applications.

Question 2

What does 'deck height' refer to in engine rebuilding?

Accepted Answer

Distance from crank centerline to block deck surface

Answer

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.

Question 3

Which condition requires replacement rather than reconditioning of a crankshaft?

Accepted Answer

Cracks detected by magnetic particle inspection

Answer

Cracks discovered by magnetic particle or dye penetrant inspection are cause for crankshaft rejection; cracked cranks cannot be safely reconditioned.

Question 4

When installing camshaft bearings, what alignment is critical?

Accepted Answer

Oil hole in bearing must align with oil passage in block

Answer

The oil feed hole in each camshaft bearing must align precisely with the corresponding oil passage in the block to ensure proper lubrication.

Question 5

What is 'bearing crush' and why is it important?

Accepted Answer

The amount bearing shell extends beyond the housing bore to create interference fit

Answer

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.

(AERA) Automotive Engine Rebuilders Association Certification Practice Test

(AERA) Automotive Engine Rebuilders Association Certification Practice Test

AERA Engine Rebuilding Techniques & Procedures 3