AERA Component Inspection & Quality Control 4

Question 1

A cylinder head surface that shows low spots when checked with a straight edge and feeler gauge requires:

Accepted Answer

Resurfacing to restore flatness

Answer

Low spots indicate warpage; resurfacing (milling or grinding the deck) removes material to restore a flat sealing surface within specification.

Question 2

The maximum allowable warpage for a typical V8 engine cylinder head deck surface is often specified as:

Accepted Answer

0.004 in (0.10 mm) overall or 0.002 in per 6 in

Answer

Most OEM specifications limit warpage to approximately 0.004 in overall or 0.002 in per any 6-inch span to ensure proper head gasket sealing.

Question 3

When inspecting valve seats, a seat that is too wide will cause:

Accepted Answer

Poor heat transfer from the valve face and valve burning

Answer

Overly wide seats reduce the contact pressure per unit area, impeding heat transfer from the valve to the head, which can cause the valve to overheat and burn.

Question 4

What does excessive end play in a crankshaft indicate?

Accepted Answer

Worn or damaged thrust bearings/washers

Answer

Crankshaft end play is controlled by thrust bearings or thrust flanges; worn thrust surfaces allow excessive axial movement of the crankshaft.

Question 5

A technician finds that a block's main bearing tunnel measures 0.003 in larger in diameter than specification. The BEST corrective action is:

Accepted Answer

Line bore or line hone the block to restore proper geometry, then use correct bearings

Answer

An oversized main tunnel must be line bored or line honed back to the correct diameter and roundness before installing bearings of the proper size.

(AERA) Automotive Engine Rebuilders Association Certification Practice Test

(AERA) Automotive Engine Rebuilders Association Certification Practice Test

AERA Component Inspection & Quality Control 4