Question 1

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. D

Question 2

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

Accepted Answer

valve job

Question 3

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. B

Question 4

Cracks in iron heads are commonly repaired with tapered, threaded plugs. This process is known in the industry as ____________________ a crack.

Accepted Answer

The answer of Cracks in iron heads are commonly repaired...

Question 5

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 6

If the head is installed on the engine and you want to rotate the camshaft to a different position during belt installation, you should move the pistons partway down in their bores (about ____ degrees) in order for the valves to clear the pistons.

Accepted Answer

A) 25 
B) 45 
C) 90 
D) 180 
A) 25 
B) 45 
C) 90 
D) 180

Question 7

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 8

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 9

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

Question 10

Under what circumstances would a hydraulic lifter fail?

Accepted Answer

Hydraulic lifters can fail for several r

Question 11

When the seat and valve are reground, the stem moves further into the cylinder head. This results in increased valve stem tip height and ____________________ installed height.

Accepted Answer

The answer of When the seat and valve are reground,...

Question 12

How do you inspect a timing belt?

Accepted Answer

When inspecting a timing belt, rotate th

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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 15

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

Accepted Answer

screw-type

Question 16

Which of the following statements is LEAST-Likely true?

Accepted Answer

A) The cam and lifters on pushrod engines become wear-mated after the first few weeks the engine is run. 
B) Used lifters will rapidly wear out a new cam. 
C) If a cam is to be reused, it is important that the lifters be kept in order for replacement on their respective lobes. 
D) If a flat-tappet cam is replaced, replace the lifters also. 
A) The cam and lifters on pushrod engines become wear-mated after the first few weeks the engine is run. 
B) Used lifters will rapidly wear out a new cam. 
C) If a cam is to be reused, it is important that the lifters be kept in order for replacement on their respective lobes. 
D) If a flat-tappet cam is replaced, replace the lifters also.

Question 17

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 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

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

Accepted Answer

1.Use a split ball gauge and a micromete

Question 20

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

Accepted Answer

After the valve and seat have been groun

Exam 52: Engine Diagnosis and Service: Cylinder Head and Valve Train

All of the following statements are true EXCEPT:

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

All of the following statements are true EXCEPT:

Cracks in iron heads are commonly repaired with tapered, threaded plugs. This process is known in the industry as ____________________ a crack.

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

If the head is installed on the engine and you want to rotate the camshaft to a different position during belt installation, you should move the pistons partway down in their bores (about ____ degrees) in order for the valves to clear the pistons.

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

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?

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?

Under what circumstances would a hydraulic lifter fail?

When the seat and valve are reground, the stem moves further into the cylinder head. This results in increased valve stem tip height and ____________________ installed height.

How do you inspect a timing belt?

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

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.

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

Which of the following statements is LEAST-Likely true?

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

Which of the following statements is LEAST-Likely true?

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

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

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 Vehicle on Ground

Undercar Inspection and Service

Introduction to the Engine

Engine Classifications and Types

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

Petroleum Fuels and Alternative Fuel Technologies

Fuel System Fundamentals, Gasoline and Diesel

Fuel System Service

Intake and Exhaust Systemsturbochargers and Superchargers

Emission Control System Fundamentals, Gasoline and Diesel

Emission Control System Service

Electronics and Computer Systems Fundamentals

Electronics and Computer Systems Service

Advanced Emission and On-Board Diagnostics Obd

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

Brake Service

Antilock Brakes, Traction, and Stability Control

Bearings, Seals, and Greases