Question 1

Briefly describe the two techniques used to check valve stem-to-guide clearance.

Accepted Answer

1.Use a split ball gauge and a micrometer. Measure at the top, bottom, and center. 
2.Using a dial indicator, rock the valve back and forth. When measuring with an indicator, divide the measurement by 2 for the amount of valve-to-guide clearance. Hold the valve in its normally open position during the measurement. A hose can be cut to the correct length to hold each valve open the correct amount.

Question 2

How do you inspect a timing belt?

Accepted Answer

When inspecting a timing belt, rotate the engine slowly by hand: 
1. Look for fraying, cracks at the base of a tooth, or loose fibers. 
2. Wear on one side of a tooth indicates a misalignment problem. 
3. Check for oil leaks, which could damage the belt.

Question 3

Carbon can be removed from valve necks with a wire wheel.

Accepted Answer

A) True 
 B)False  True

Question 4

Dress the edge of a(n) ____ tip with a file or whetstone before removing the valve from the valve guide.

Accepted Answer

The answer of Dress the edge of a(n) ____ tip...

Question 5

How are valve guides repaired?

Accepted Answer

Valve guides can be repaired in several

Question 6

If the camshaft does not turn easily and the machine shop only resurfaces the bottom side of the head, a broken camshaft can result.

Accepted Answer

A) True 
 B)False

Question 7

What are the steps involved in solvent testing the valve and seat?

Accepted Answer

After the valve and seat have been groun

Question 8

Under what circumstances would a hydraulic lifter fail?

Accepted Answer

Hydraulic lifters can fail for several r

Question 9

With cam-in-block engines, as pushrods, rocker arms, and other valve train parts wear, lash ____.

Accepted Answer

A)  tightens 
B)  decreases 
C)  increases 
D)  stabilizes 
A)  tightens 
B)  decreases 
C)  increases 
D)  stabilizes

Question 10

While having a discussion, Technician A says that a stuck lifter plunger can sometimes be freed using an oil additive. Technician B says that it can sometimes be freed up by spraying fuel system spray cleaner down a hollow pushrod oil channel. Who is correct?

Accepted Answer

A)  A only 
B)  B only 
C)  Both A and B 
D)  Neither A nor B 
A)  A only 
B)  B only 
C)  Both A and B 
D)  Neither A nor B

Question 11

All of the following statements are true EXCEPT:

Accepted Answer

A)  some springs have coils more closely spaced at one end than at the other. 
B)  cast rocker arms that are shaft mounted cannot be reground. 
C)  on a worn engine, valve guide seals can be replaced without removing the head. 
D)  stud-mounted rocker arms are not serviceable and are replaced when worn. 
A)  some springs have coils more closely spaced at one end than at the other. 
B)  cast rocker arms that are shaft mounted cannot be reground. 
C)  on a worn engine, valve guide seals can be replaced without removing the head. 
D)  stud-mounted rocker arms are not serviceable and are replaced when worn.

Question 12

The small ____________________ compressor is especially handy for compressing springs when the heads are on the engine.

Accepted Answer

screw-type

Question 13

When water has been entering the combustion chamber from a leaking head gasket or a crack in the head, there will be carbon on the surfaces of the combustion chamber and piston.

Accepted Answer

A) True 
 B)False

Question 14

When a cylinder head is removed to have the valves and seats refinished, this is called a(n) ____________________.

Accepted Answer

The answer of When a cylinder head is removed to...

Question 15

Warp readings on the top and bottom sides of an OHC head are always equal.

Accepted Answer

A) True 
 B)False

Question 16

The part that will MOST-Likely warp, especially when a head gasket has failed because an engine has overheated, is the:

Accepted Answer

A)  gasket 
B)  cylinder head 
C)  crankshaft 
D)  plenum 
A)  gasket 
B)  cylinder head 
C)  crankshaft 
D)  plenum

Question 17

All of the following statements are true EXCEPT:

Accepted Answer

A)  magnaflux is the common trade name for a more sophisticated type of magnetic crack detection. 
B)  heads that are especially susceptible to cracks are often inspected by pressure testing 
C)  crack inspection on iron heads can be performed using a simple magnetic crack detector. 
D)  removal of 0.020" from OHC head surfaces results in about 10 degrees of retard in valve timing. 
A)  magnaflux is the common trade name for a more sophisticated type of magnetic crack detection. 
B)  heads that are especially susceptible to cracks are often inspected by pressure testing 
C)  crack inspection on iron heads can be performed using a simple magnetic crack detector. 
D)  removal of 0.020" from OHC head surfaces results in about 10 degrees of retard in valve timing.

Question 18

Which of the following statements is LEAST-Likely true?

Accepted Answer

A)  Servicing valve guides before seat refinishing will result in an off-center valve seat that must be reground or cut. 
B)  Exhaust seats are wider than intake seats because valve cooling is critical. 
C)  A valve that is off-center will leak, causing the engine to idle rough when cold. 
D)  Valve guides must be refinished before attempting to refinish valve seats. 
A)  Servicing valve guides before seat refinishing will result in an off-center valve seat that must be reground or cut. 
B)  Exhaust seats are wider than intake seats because valve cooling is critical. 
C)  A valve that is off-center will leak, causing the engine to idle rough when cold. 
D)  Valve guides must be refinished before attempting to refinish valve seats.

Question 19

During head disassembly, you should MOST-Likely measure and record:

Accepted Answer

A)  valve tip 
B)  valve clearance 
C)  valve spring installed height 
D)  valve stem height 
A)  valve tip 
B)  valve clearance 
C)  valve spring installed height 
D)  valve stem height

Question 20

While having a discussion, Technician A says that, if valve lash is too tight, the valve will not contact the valve seat for a long enough time to cool. Technician B says that if valve lash is too tight, it will cause the valve to burn. Who is correct?

Accepted Answer

A)  A only 
B)  B only 
C)  Both A and B 
D)  Neither A nor B 
A)  A only 
B)  B only 
C)  Both A and B 
D)  Neither A nor B

Exam 52: Engine Diagnosis and Service: Cylinder Head and Valvetrain

Briefly describe the two techniques used to check valve stem-to-guide clearance.

How do you inspect a timing belt?

Carbon can be removed from valve necks with a wire wheel.

Dress the edge of a(n) ____ tip with a file or whetstone before removing the valve from the valve guide.

How are valve guides repaired?

If the camshaft does not turn easily and the machine shop only resurfaces the bottom side of the head, a broken camshaft can result.

What are the steps involved in solvent testing the valve and seat?

Under what circumstances would a hydraulic lifter fail?

With cam-in-block engines, as pushrods, rocker arms, and other valve train parts wear, lash ____.

While having a discussion, Technician A says that a stuck lifter plunger can sometimes be freed using an oil additive. Technician B says that it can sometimes be freed up by spraying fuel system spray cleaner down a hollow pushrod oil channel. Who is correct?

All of the following statements are true EXCEPT:

The small ____________________ compressor is especially handy for compressing springs when the heads are on the engine.

When water has been entering the combustion chamber from a leaking head gasket or a crack in the head, there will be carbon on the surfaces of the combustion chamber and piston.

When a cylinder head is removed to have the valves and seats refinished, this is called a(n) ____________________.

Warp readings on the top and bottom sides of an OHC head are always equal.

The part that will MOST-Likely warp, especially when a head gasket has failed because an engine has overheated, is the:

All of the following statements are true EXCEPT:

Which of the following statements is LEAST-Likely true?

During head disassembly, you should MOST-Likely measure and record:

While having a discussion, Technician A says that, if valve lash is too tight, the valve will not contact the valve seat for a long enough time to cool. Technician B says that if valve lash is too tight, it will cause the valve to burn. Who is correct?

Introduction to the Automobile

Automotive Careers and Technician Certification

Shop Safety

Shop Management, Service Records, and Parts

Locating Service Information and Specifications

Measuring Tools and Systems

Hardware, Fasteners, Drills, and Thread Repair

Shop Tools

General Shop Equipment

Cleaning Equipment and Methods

Lifting Equipment and Air Compressors

Engine Lubrication

Underhood and Body Inspection Car on Ground

Undercar Inspection and Service

Introduction to the Engine

Engine Classifications and Advanced Transportation Technologies

Engine Size and Measurements

Engine Upper End

Engine Lower End and Lubrication System Theory

Cooling System Theory

Cooling System Service

Automotive Belts

Automotive Hoses

Automotive Plumbing: Tubing and Pipe

Basic Electrical System Theory and Repairs

Battery Fundamentals

Battery Service

Starting System Fundamentals

Starting System Service

Charging System Fundamentals

Charging System Service

Lighting and Wiring Fundamentals

Lighting and Wiring Service

Safety, Security, Comfort Systems, and Electrical Accessories

Heating and Air Conditioning Fundamentals

Heating and Air Conditioning Service

Ignition System Fundamentals

Ignition System Service

Fuels and Alternative Fuels

Fuel System Fundamentals

Fuel System Service

Intake and Exhaust Systems, Turbochargers and Superchargers

Emission Control System Fundamentals

Emission Control System Service

Electronics and Computer Systems Fundamentals

Electronics and Computer Systems Service

Advanced Emissions and On-Board Diagnostics Odb

Diagnosing Engine Performance Problems

Diagnosing Engine Mechanical Problems

Engine Removal and Disassembly

Engine Sealing, Gaskets, Fastener Torque

Engine Diagnosis and Service: Block, Crankshaft, Bearings, and Lubrication System

Engine Diagnosis and Service: Piston, Piston Rings, Connecting Rod, Engine Balancing

Ordering Parts, Short and Long Blocks, Engine Assembly

Engine Installation, Break In, and In-Chassis Repairs

Brake Fundamentals

Brakes Service

Anti-Lock Brakes Traction and Stability Control

Bearings, Seals, and Greases