# Quiz 3 - Upper Engine/Timing Components

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Payments review questions on timing components

• 1.

### Technician A checks camchaft wear with a micrometer. Technician B uses a dial indicator. Who is correct?

• A.

A only

• B.

B only

• C.

Both A and B

• D.

Neither A nor B

C. Both A and B
Explanation
Both Technician A and Technician B are correct. Checking camshaft wear requires measuring the dimensions accurately. Technician A uses a micrometer, which is a precision instrument used for measuring small distances or thicknesses. Technician B uses a dial indicator, which is also a precision instrument commonly used for measuring small distances or displacements. Therefore, both technicians are using appropriate tools to accurately measure camshaft wear.

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• 2.

### All of the following are correct statements about camshafts except:

• A.

The camshaft rotates at twice the speed of the crankshaft

• B.

The camshaft drive gear or sprocket is twice as large as the crankshaft sprocket

• C.

For every two turns of the crankshaft, the camshaft turns once.

• D.

The exhaust and intake valves each open once during four strokes

A. The camshaft rotates at twice the speed of the crankshaft
Explanation
The camshaft rotates at half the speed of the crankshaft, not twice the speed.

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• 3.

### When a camshaft is worn to the point of replacement, what else should be replaced?

• A.

Valve lifters

• B.

Timing drive components

• C.

Both A and B

• D.

Neither A nor B

C. Both A and B
Explanation
When a camshaft is worn to the point of replacement, both the valve lifters and timing drive components should be replaced. The camshaft and valve lifters work together to open and close the engine valves, and if the camshaft is worn, it can cause damage to the valve lifters. Additionally, the timing drive components, such as the timing belt or chain, are connected to the camshaft and are responsible for keeping the engine's valves and pistons in sync. If the camshaft is worn, it can also affect the timing drive components, leading to further engine damage. Therefore, both A (valve lifters) and B (timing drive components) should be replaced when the camshaft is worn.

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• 4.

### Which type of lifter must have manually adjustable valves?

• A.

Hydraulic

• B.

Solid

• C.

Both A and B

• D.

Neither A nor B

A. Hydraulic
Explanation
Hydraulic lifters must have manually adjustable valves because they rely on oil pressure to maintain proper valve lash. The oil pressure is controlled by adjusting the valve clearance manually to ensure that the lifter operates correctly. Solid lifters, on the other hand, do not rely on oil pressure and therefore do not require manual adjustment. Therefore, the correct answer is hydraulic.

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• 5.

### When one hydraulic lifter is collapsed and causing valvetrain noise, what is the most likely cause?

• A.

One worn or dirty lifter

• B.

Low oil pressure

• C.

High oil pressure

• D.

Incorrect valve timing

A. One worn or dirty lifter
Explanation
When one hydraulic lifter is collapsed and causing valvetrain noise, the most likely cause is one worn or dirty lifter. This means that the lifter is either worn out or has accumulated dirt, preventing it from functioning properly. This can lead to a loss of oil pressure in that lifter, causing it to collapse and create the valvetrain noise. Low or high oil pressure, as well as incorrect valve timing, are less likely to be the cause of the issue.

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• 6.

### When all the hydraulic lifters are collapsed and causing valvetrain noise, what is the most likely cause?

• A.

One worn or dirty lifter

• B.

Low oil pressure

• C.

High oil pressure

• D.

Incorrect valve timing

B. Low oil pressure
Explanation
The most likely cause for all the hydraulic lifters being collapsed and causing valvetrain noise is low oil pressure. Hydraulic lifters rely on oil pressure to maintain proper functioning and prevent noise. If the oil pressure is low, it may not be able to adequately supply the lifters, causing them to collapse and create noise.

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• 7.

### What is typically the maximum amount of warpage that is acceptable on an average cylinder head?

• A.

.001 inch

• B.

.005 inch

• C.

.010 inch

• D.

.015 inch

B. .005 inch
Explanation
The typically acceptable maximum amount of warpage on an average cylinder head is .005 inch. This means that any warpage within this range is considered normal and does not pose a significant issue. Warpage refers to the deformation or bending of the cylinder head, which can affect its performance and sealing capabilities. Therefore, it is important to ensure that the warpage remains within acceptable limits to maintain the proper functioning of the cylinder head.

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• 8.

### Multiple valve engines tend to be more efficient than engines with two valves per cylinder because they:

• A.

Allow for increased port areas

• B.

Provide more valve area

• C.

Provide less restriction to the airflow

• D.

All of the above

D. All of the above
Explanation
Multiple valve engines tend to be more efficient than engines with two valves per cylinder because they allow for increased port areas, provide more valve area, and provide less restriction to the airflow. This means that the engine can intake and exhaust gases more effectively, leading to improved combustion and power output. Additionally, the increased valve area allows for better control of the air-fuel mixture, resulting in better fuel efficiency. Overall, having multiple valves per cylinder enhances the engine's performance and efficiency.

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• 9.

### Technician A says worn valve stem seals can increase oil consumption. Technician B says worn valve stem seals can cause valve deposits. Who is correct?

• A.

A only

• B.

B only

• C.

Both A and B

• D.

Neither A nor B

C. Both A and B
Explanation
Both Technician A and Technician B are correct. Worn valve stem seals can indeed increase oil consumption as they fail to properly seal the valve stems, allowing oil to leak into the combustion chamber. This leads to oil being burned along with the fuel, resulting in increased oil consumption. Additionally, worn valve stem seals can cause valve deposits as they allow oil to enter the combustion chamber and form carbon deposits on the valves. These deposits can hinder proper valve operation and lead to various engine problems.

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• 10.

### Technician A says that timing belts are typically stretched into place using a pry bar. Technician B says timing belts should be lubricated. Who is correct?

• A.

A only

• B.

B only

• C.

Both A and B

• D.

Neither A nor B

D. Neither A nor B
Explanation
Neither Technician A nor Technician B is correct. Timing belts are not typically stretched into place using a pry bar. Instead, they are carefully installed according to the manufacturer's specifications, ensuring proper tension and alignment. Additionally, timing belts should not be lubricated as they are made of a special material that is designed to work without lubrication.

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• 11.

### Technician A says that timing chains typically are provided with splash lubrication. Technician B says timing gears should always be replaced as a set. Who is correct?

• A.

A only

• B.

B only

• C.

Both A and B

• D.

Neither A nor B

C. Both A and B
Explanation
Both Technician A and Technician B are correct. Technician A is correct in stating that timing chains typically are provided with splash lubrication. This means that the timing chain is lubricated by the oil splashing around inside the engine. Technician B is correct in stating that timing gears should always be replaced as a set. This is because the gears wear together and replacing only one gear can lead to uneven wear and potential timing issues.

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• 12.

### Which of the following typically would not have a timing mark?

• A.

Idler Shaft Sprocket

• B.

Camshaft Sprocket

• C.

Balance Shaft Sprocket

• D.

Crankshaft Sprocket

A. Idler Shaft Sprocket
Explanation
The idler shaft sprocket typically would not have a timing mark because it is not directly involved in the timing of the engine. The idler shaft sprocket is responsible for maintaining tension on the timing belt or chain, but it does not need to be precisely timed with the other components. Therefore, it does not require a timing mark.

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• 13.

### What type of engine damage is most likely if a timing belt or chain breaks?

• A.

Broken camshaft

• B.

Bent valves

• C.

Broken crankshaft

• D.

No damage can possible occur

B. Bent valves
Explanation
If a timing belt or chain breaks, the most likely engine damage would be bent valves. This is because the timing belt or chain is responsible for synchronizing the movement of the camshaft and the valves. If the belt or chain breaks, the camshaft stops rotating, and the valves may remain open when they should be closed. As a result, when the piston comes up, it can collide with the open valves, causing them to bend. This can lead to a loss of compression and engine performance.

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• 14.

### What is a typical recommended timing belt change interval mileage?

• A.

20,000 to 50,000 miles

• B.

40,000 to 50,000 miles

• C.

60,000 to 100,000 miles

• D.

There is never a scheduled belt change

C. 60,000 to 100,000 miles
Explanation
A typical recommended timing belt change interval mileage is 60,000 to 100,000 miles. This means that it is generally advised to replace the timing belt of a vehicle within this mileage range to prevent potential issues or failures.

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• Current Version
• Mar 21, 2023
Quiz Edited by
ProProfs Editorial Team
• May 02, 2009
Quiz Created by
Ozzzmann