Engine Rebuilding Techniques & Procedures Flashcards

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

Answer: Replace after each use and never reuse

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

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

Answer: Restore main bearing bore alignment and roundness

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

During piston ring installation, which ring is installed first?

Answer: Oil control expander ring

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.

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

Answer: Normal wear from combustion pressure and ring travel

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

What is the correct way to check crankshaft end play?

Answer: Dial indicator measuring axial movement with crank pried fore and aft

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

When measuring connecting rod big-end bore diameter, where should measurements be taken?

Answer: At two locations 90 degrees apart to check for out-of-round

Measuring at two locations 90 degrees apart reveals any out-of-round condition in the big-end bore.

What is the function of valve stem seals during engine operation?

Answer: Control oil consumption by metering oil onto the valve stem

Valve stem seals meter a controlled, minimal amount of oil onto the valve stem for lubrication while preventing excessive oil from being drawn into the combustion chamber.