Question 1

Internal balancing of forged cranks is MOST-Likely achieved by drilling holes on the:

Accepted Answer

A) connecting rods 
B) bob weights 
C) ring groove 
D) counterweights 
A) connecting rods 
B) bob weights 
C) ring groove 
D) counterweights D

Question 2

When inspecting piston rings for wear, what should you look for?

Accepted Answer

When inspecting rings for wear, look for the following:
1. When wear is due to dirty air getting in, the top ring will show more wear and vertical abrasive lines will be visible. Scratches will be visible on the cylinder wall in the area where the rings ride.
2. When ring wear is due to abrasives in the engine oil, the lower rings and cylinder wall will have more wear and the top ring will have less wear.
3. When abrasives cause wear, the bottom side of a ring will wear, leaving a lip on the outside edge.

Question 3

When a replacement piston is heavier than the others, it can be lightened at the ____________________.

Accepted Answer

balance pads

Question 4

Which of the following statements is LEAST-Likely true?

Accepted Answer

A) As the engine operates, rings will rotate from the position where they were first installed. 
B) End gap position is one of the causes of oil consumption. 
C) If an engine has operated for 100,000 miles or more without an unusual wear problem, the rod can safely be reused with new bearing inserts. 
D) A bent rod will show wear on opposite sides of the rod bearings. 
A) As the engine operates, rings will rotate from the position where they were first installed. 
B) End gap position is one of the causes of oil consumption. 
C) If an engine has operated for 100,000 miles or more without an unusual wear problem, the rod can safely be reused with new bearing inserts. 
D) A bent rod will show wear on opposite sides of the rod bearings.

Question 5

To maintain engine balance, a new replacement piston's weight should match that of the original piston.

Accepted Answer

A) True 
 B)False

Question 6

Excessive heat can cause ____________________, which occurs when the cylinder wall and piston momentarily weld to each other when the piston stops at TDC.

Accepted Answer

The answer of Excessive heat can cause ____________________, which occurs...

Question 7

Why is it a bad idea to overtighten rod bolts?

Accepted Answer

Overtightening rod bolts can c

Question 8

What causes piston ring wear?

Accepted Answer

The following are some of the things tha

Question 9

All of the following statements are true EXCEPT:

Accepted Answer

A) correcting dynamic imbalance can result in the correction of force imbalance at the same time. 
B) primary vibrations are only about one-fourth of the strength of secondary vibrations but can become quite severe at the higher rpm at which four-cylinder engines quite often operate. 
C) computer balancers compute the combined amount of dynamic and force imbalance and tell where to remove metal to correct them. 
D) balance shafts are used to cancel out secondary vibration. 
A) correcting dynamic imbalance can result in the correction of force imbalance at the same time. 
B) primary vibrations are only about one-fourth of the strength of secondary vibrations but can become quite severe at the higher rpm at which four-cylinder engines quite often operate. 
C) computer balancers compute the combined amount of dynamic and force imbalance and tell where to remove metal to correct them. 
D) balance shafts are used to cancel out secondary vibration.

Question 10

Damaging a metal surface raises stress, weakening the part. This is called a(n) "____________________."

Accepted Answer

The answer of Damaging a metal surface raises stress, weakening...

Question 11

When the piston slows down as it approaches TDC, its force pulls the engine up. When it approaches BDC, it pulls the engine down. This is known as ____.

Accepted Answer

A) primary vibration 
B) end gap 
C) rocking couple 
D) stress raising 
A) primary vibration 
B) end gap 
C) rocking couple 
D) stress raising

Question 12

The parts that are MOST-Likely used when spinning the crankshaft to simulate the correct weight are:

Accepted Answer

A) bob weights 
B) counterweights 
C) ring grooves 
D) plugs 
A) bob weights 
B) counterweights 
C) ring grooves 
D) plugs

Question 13

While having a discussion, Technician A says that replacement pistons for passenger cars and light trucks are destroked 0.15" to compensate for block and head resurfacing. Technician B says that they are destroked at 0.25". 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 14

While having a discussion, Technician A says that balance is not as important with V-type engines, but it is critical with in-line engines. Technician B says that balance is not as important with in-line engines, but it is critical in V-type engines. 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 15

Compression rings are removed using a(n) ____________________.

Accepted Answer

The answer of Compression rings are removed using a(n) ____________________....

Question 16

____________________ is done when a rod bearing has burned or if the big end has stretched.

Accepted Answer

Connecting

Question 17

____, also called static or kinetic imbalance, can be compared to the type of imbalance that is corrected when balancing tires with a bubble (level) balancer.

Accepted Answer

A) End gap 
B) Vibration imbalance 
C) Scuffing 
D) Force 
A) End gap 
B) Vibration imbalance 
C) Scuffing 
D) Force

Question 18

How would you resize a rod?

Accepted Answer

When resizing a rod:
1. The pressed-fit

Question 19

Whenever an engine is disassembled, the piston rings are replaced.

Accepted Answer

A) True 
 B)False

Question 20

An increase of 0.002" in the bore size will increase the gap by about 0.016".

Accepted Answer

A) True 
 B)False

Exam 54: Engine Diagnosis and Service: Piston, Piston Rings, Connecting Rod, Engine Balancing

Internal balancing of forged cranks is MOST-Likely achieved by drilling holes on the:

When inspecting piston rings for wear, what should you look for?

When a replacement piston is heavier than the others, it can be lightened at the ____________________.

Which of the following statements is LEAST-Likely true?

To maintain engine balance, a new replacement piston's weight should match that of the original piston.

Excessive heat can cause ____________________, which occurs when the cylinder wall and piston momentarily weld to each other when the piston stops at TDC.

Why is it a bad idea to overtighten rod bolts?

What causes piston ring wear?

All of the following statements are true EXCEPT:

Damaging a metal surface raises stress, weakening the part. This is called a(n) "____________________."

When the piston slows down as it approaches TDC, its force pulls the engine up. When it approaches BDC, it pulls the engine down. This is known as ____.

The parts that are MOST-Likely used when spinning the crankshaft to simulate the correct weight are:

While having a discussion, Technician A says that replacement pistons for passenger cars and light trucks are destroked 0.15" to compensate for block and head resurfacing. Technician B says that they are destroked at 0.25". Who is correct?

While having a discussion, Technician A says that balance is not as important with V-type engines, but it is critical with in-line engines. Technician B says that balance is not as important with in-line engines, but it is critical in V-type engines. Who is correct?

Compression rings are removed using a(n) ____________________.

____________________ is done when a rod bearing has burned or if the big end has stretched.

____, also called static or kinetic imbalance, can be compared to the type of imbalance that is corrected when balancing tires with a bubble (level) balancer.

How would you resize a rod?

Whenever an engine is disassembled, the piston rings are replaced.

An increase of 0.002" in the bore size will increase the gap by about 0.016".

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

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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

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Automotive Belts

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Automotive Plumbing: Tubing and Pipe

Basic Electrical System Theory and Repairs

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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: Cylinder Head and Valve Train

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

Ordering Parts, Short and Long Blocks, Engine Assembly

Engine Installation, Break-In, and In-Chassis Repairs

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Bearings, Seals, and Greases