AERA Engine Rebuilding Techniques & Procedures 2

Question 1

When using a torque-to-yield (TTY) head bolt, what is the correct procedure?

Accepted Answer

Replace after each use and never reuse

Answer

TTY bolts plastically deform during installation and must be replaced each time to ensure proper clamping force.

Question 2

What is the primary purpose of line boring a cylinder block after main bearing cap installation?

Accepted Answer

Restore main bearing bore alignment and roundness

Answer

Line boring restores the main bearing bores to their correct size, shape, and alignment relative to each other.

Question 3

During piston ring installation, which ring is installed first?

Accepted Answer

Oil control expander ring

Answer

The oil control expander ring is installed first in the bottom ring groove, followed by the oil rails, then the compression rings from bottom to top.

Question 4

What condition is indicated when a cylinder bore shows a pronounced taper that is largest at the top of the bore?

Accepted Answer

Normal wear from combustion pressure and ring travel

Answer

Top-of-bore taper is normal wear because combustion pressure forces rings hardest against the cylinder wall at TDC where lubrication is minimal.

Question 5

What is the correct way to check crankshaft end play?

Accepted Answer

Dial indicator measuring axial movement with crank pried fore and aft

Answer

A dial indicator mounted to measure axial movement while prying the crankshaft fore and aft gives an accurate end play reading.

(AERA) Automotive Engine Rebuilders Association Certification Practice Test