Driveshafts, Joints, And Wheel Bearings
A driveshaft is a mechanical component for transmitting torque and rotation, joints are connections between two rigid bodies, and wheel bearings are sets of steel balls held together by a metal ring. What do you know about these items?
Questions and Answers
- 1.
Technician A says the front wheel bearings on a typical FWD car are sealed and non-adjustable. Technician B says the front wheel bearings on a typical FWD car are greaseable and adjustable. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
Correct Answer
A. A onlyExplanation
Technician A is correct. Front wheel bearings on a typical FWD car are sealed and non-adjustable. Sealed bearings are designed to be maintenance-free and do not require regular greasing. They are pre-lubricated and sealed to prevent dirt and moisture from entering the bearing. Non-adjustable bearings are set to specific tolerances during manufacturing and do not require adjustment. Technician B's statement about front wheel bearings being greaseable and adjustable is incorrect.Rate this question:
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- 2.
Technician A says front bearing assembly locknuts for tapered roller bearings are typically heavily torqued to maintain the bearing adjustment at zero play. Technician B says the axle nut for a FWD front wheel bearing assembly is often staked or otherwise locked in place. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither bA nor B
Correct Answer
B. B onlyExplanation
Technician B is correct. The axle nut for a FWD front wheel bearing assembly is often staked or otherwise locked in place to prevent it from loosening over time. This helps to maintain the proper adjustment and prevent any play in the bearing assembly. On the other hand, Technician A's statement about heavily torqued front bearing assembly locknuts for tapered roller bearings is not mentioned in the question and therefore cannot be determined as correct.Rate this question:
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- 3.
What type of wheel bearing is usually serviced by disassembling, cleaning, inspecting, repacking with grase, reassembling, and adjusting?
- A.
Tapered roller
- B.
Roller
- C.
Sealed roller
- D.
Sleeve
Correct Answer
A. Tapered rollerExplanation
Tapered roller wheel bearings are usually serviced by disassembling, cleaning, inspecting, repacking with grease, reassembling, and adjusting. This type of bearing design allows for easy disassembly and maintenance. By following these steps, the bearings can be properly cleaned, inspected for any damage or wear, and then repacked with grease to ensure smooth operation. Finally, the bearings are reassembled and adjusted to the appropriate tightness for optimal performance. This maintenance process helps to prolong the lifespan of the tapered roller wheel bearings.Rate this question:
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- 4.
What type of wheel bearing is uaually used in front wheel drive application and is serviced by replacement?
- A.
Tapered roller
- B.
Roller
- C.
Sealed roller
- D.
Sleeve
Correct Answer
C. Sealed rollerExplanation
Sealed roller bearings are usually used in front wheel drive applications and are serviced by replacement. Sealed roller bearings are designed to be maintenance-free and provide better protection against contaminants such as dirt and water. They are commonly used in automotive applications where ease of maintenance and durability are important factors.Rate this question:
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- 5.
What type of wheel bearing should normally have no perceivable wobble or play?
- A.
Tapered roller
- B.
Roller
- C.
Sealed roller
- D.
Sleeve
Correct Answer
C. Sealed rollerExplanation
Sealed roller wheel bearings should normally have no perceivable wobble or play. This is because sealed roller bearings are designed to provide a tight and secure fit, minimizing any movement or play in the wheel. The sealed design also helps to keep out dirt, moisture, and other contaminants, ensuring smooth and reliable performance of the bearing.Rate this question:
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- 6.
A vehicle has a growling noise that increases with vehicle speed. It is also noticed that the noise is louder on hard high speed right turns but it goes away on hard high speed left turns. What is the most likely cause?
- A.
A bad right side wheel bearing
- B.
A bad right side CV joint
- C.
A bad left side CV joint
- D.
A bad left side wheel bearing
Correct Answer
D. A bad left side wheel bearingExplanation
The most likely cause for the growling noise that increases with vehicle speed and is louder on hard high speed right turns but goes away on hard high speed left turns is a bad left side wheel bearing. A worn or damaged wheel bearing can cause a growling noise that intensifies with speed. The fact that the noise is louder on right turns suggests that the left side wheel bearing is under more stress during those turns, exacerbating the issue.Rate this question:
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- 7.
Typically, constant velocity joints are not used in:
- A.
Conventional front-wheel drive vehicles
- B.
Front-wheel drive vehicles with independent front suspension
- C.
Conventional rear-wheel drive vehicles
- D.
Rear-wheel drive vehicles with independent rear suspension
Correct Answer
C. Conventional rear-wheel drive vehiclesExplanation
Constant velocity joints are not used in conventional rear-wheel drive vehicles because these vehicles do not require the same level of flexibility and articulation in the drivetrain as front-wheel drive vehicles. In rear-wheel drive vehicles, the wheels are driven by a driveshaft connected to the transmission, which does not require the same amount of movement and flexibility as the front wheels in a front-wheel drive vehicle. Therefore, constant velocity joints are not necessary in conventional rear-wheel drive vehicles.Rate this question:
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- 8.
The CV joints nearest the transaxle are called the:
- A.
Inner joints
- B.
Inboard joints
- C.
Outboard joints
- D.
Both A and B
Correct Answer
D. Both A and BExplanation
The CV joints nearest the transaxle are called the inner joints and inboard joints. The inner joints are located on the inner side of the transaxle, while the inboard joints are located closer to the center of the vehicle. These joints are responsible for transmitting power from the transaxle to the wheels, allowing for smooth and efficient rotation.Rate this question:
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- 9.
Which part is most likely defective when a front drive car has a clicking noise during hard cornering?
- A.
Inner plunging type CV joint
- B.
Front wheeel bearing
- C.
Front universal joint
- D.
Outer fixed type CV joint
Correct Answer
D. Outer fixed type CV jointExplanation
The outer fixed type CV joint is most likely defective when a front drive car has a clicking noise during hard cornering. The CV joint is responsible for transferring power from the transmission to the wheels, and the outer fixed type CV joint is located on the outer end of the axle shaft. During hard cornering, the CV joint experiences increased stress and if it is worn or damaged, it can cause a clicking noise. The other options, such as the inner plunging type CV joint, front wheel bearing, and front universal joint, are not as likely to be the cause of the clicking noise in this scenario.Rate this question:
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- 10.
Which part is most likely defective when a front drive car has a clunking noise when going over bumps?
- A.
Inner plunging type CV joint
- B.
Front wheel bearing
- C.
Front universal joint
- D.
Outer fixed type CV joint
Correct Answer
A. Inner plunging type CV jointExplanation
When a front drive car has a clunking noise when going over bumps, the most likely defective part is the inner plunging type CV joint. The CV joint is responsible for transferring power from the engine to the wheels, and if it is damaged or worn out, it can cause a clunking noise. The inner plunging type CV joint is particularly prone to failure as it experiences more movement and stress compared to other parts. Therefore, it is the most probable culprit for the clunking noise in this scenario.Rate this question:
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- 11.
When replacing a CV boot:
- A.
The joint should be cleaned and inspected
- B.
New clamps should be used
- C.
New grease should be used
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
When replacing a CV boot, it is important to clean and inspect the joint to ensure that there are no damages or debris that could affect its performance. Additionally, new clamps should be used to secure the boot properly and prevent any leaks. Lastly, new grease should be applied to ensure smooth operation and proper lubrication of the joint. Therefore, all of the above options are necessary steps when replacing a CV boot.Rate this question:
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- 12.
CV joints provide:
- A.
Uniform torque transfer
- B.
Constant speed
- C.
Operation through a wide range of angles
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
CV joints, also known as constant velocity joints, provide all of the mentioned benefits. They ensure uniform torque transfer, meaning that the torque is evenly distributed between the two connected shafts. Additionally, CV joints maintain a constant speed, regardless of the angle at which they operate. This makes them suitable for various applications that require smooth and consistent power transmission, even when the shafts are at different angles. Therefore, the correct answer is "All of the above."Rate this question:
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- 13.
Technician A says FWD half shafts of equal legth help to minimize torque steer. Technician B says FWD half shafts can be equal or unequal in length. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
Correct Answer
C. Both A and BExplanation
Both Technician A and Technician B are correct. FWD half shafts of equal length can help to minimize torque steer, as equal length shafts ensure that the same amount of torque is applied to both front wheels, reducing the tendency for the vehicle to pull to one side. However, FWD half shafts can also be unequal in length, depending on the design of the vehicle. Some vehicles may have different length half shafts to accommodate other components, such as the engine placement or suspension design. Therefore, both statements are correct depending on the specific vehicle design.Rate this question:
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- 14.
What is a likely symptom of a worn universal joint?
- A.
Squeaking
- B.
A clunk when changing from 'reverse' to 'drive'
- C.
Both A and B
- D.
Neither A nor B
Correct Answer
C. Both A and BExplanation
Both squeaking and a clunk when changing from 'reverse' to 'drive' are likely symptoms of a worn universal joint. Squeaking can occur when the joint is not properly lubricated or when the bearings are worn out. A clunking sound when shifting gears can indicate that the joint is loose or damaged, causing it to move and create a noise. Therefore, both symptoms can be indicative of a worn universal joint.Rate this question:
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- 15.
Driveshaft angles are being discussed. Technician A says U-joint durability is best when driveshaft working angles are kept to a minimum. Technician B says the working angles of the front and rear U-joints don't change with tire, wheel, or suspension modifications. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
Correct Answer
A. A onlyExplanation
Technician A is correct. U-joint durability is indeed best when driveshaft working angles are kept to a minimum. When the driveshaft angles are too steep, it can cause excessive wear and tear on the U-joints, leading to premature failure. Therefore, it is important to minimize the working angles to ensure the longevity of the U-joints. On the other hand, Technician B's statement is incorrect. The working angles of the front and rear U-joints can change with tire, wheel, or suspension modifications, as these modifications can affect the overall geometry and alignment of the driveshaft.Rate this question:
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- 16.
A RWD vehicle has a vibration mainly in the steering wheel. Which is the most likely cause?
- A.
Out of balance rear tire
- B.
Defective universal joint
- C.
Out of balance front tire
- D.
Defective driveshaft center support
Correct Answer
C. Out of balance front tireExplanation
The most likely cause of the vibration mainly in the steering wheel of a RWD vehicle is an out of balance front tire. When a tire is out of balance, it can cause the steering wheel to vibrate, especially at higher speeds. This imbalance can occur due to uneven distribution of weight on the tire or a misalignment of the tire and wheel assembly. Balancing the tire by adding weights to the rim can help eliminate the vibration and improve the overall smoothness of the ride.Rate this question:
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- 17.
A RWD vehicle has a vibration throughout the vehicle. Which is the least likely cause?
- A.
Out of balance rear tire
- B.
Defective universal joint
- C.
Out of balance front tire
- D.
Defective driveshaft center support
Correct Answer
C. Out of balance front tireExplanation
The least likely cause of the vibration throughout the vehicle in a RWD vehicle is an out of balance front tire. This is because the question specifically mentions that the vehicle is RWD, which means that the power is being delivered to the rear wheels. Therefore, any issues with the front tires, such as being out of balance, would not directly cause vibrations throughout the entire vehicle. The other options, such as an out of balance rear tire, defective universal joint, and defective driveshaft center support, are more likely to cause vibrations in a RWD vehicle.Rate this question:
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- 18.
Technician A says that original U-joint caps can be held in by clips or injected plastic. Technician B says that some replacement U-joints have grease fittings. Who is correct?
- A.
A only
- B.
B only
- C.
Both A and B
- D.
Neither A nor B
Correct Answer
C. Both A and BExplanation
Both Technician A and Technician B are correct. Technician A is correct because original U-joint caps can indeed be held in place by clips or injected plastic. Technician B is correct because some replacement U-joints do have grease fittings.Rate this question:
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- 19.
A vehicle has a vibration since new U-joints were installed. The joints are the correct part numbers and have been installed into the driveshaft correctly. What is the most likely cause?
- A.
The driveshaft could have had a balancing weight knocked off
- B.
The driveshaft could have been incorrectly bolted to a companion flange
- C.
Both A and B
- D.
Neither A nor B
Correct Answer
C. Both A and BExplanation
Both options A and B could be the most likely cause for the vibration in the vehicle. If a balancing weight on the driveshaft has been knocked off, it can create an imbalance leading to vibrations. Additionally, if the driveshaft has been incorrectly bolted to a companion flange, it can cause misalignment and vibrations as well. Therefore, it is possible that both factors contribute to the vibration issue.Rate this question:
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