Question 1

What are the most common grease designation used in automotive shops?

Accepted Answer

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Question 2

A needle roller bearing is not designed to carry what type of loads?

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Question 3

When inspecting and servicing front wheel bearings  on front-wheel-drive cars:

Accepted Answer

Some front wheel bearings in front-wheel-drive cars have two tapered roller bearings with a split inner race, which allows for adjustment of bearing preload and endplay.

Question 4

When two separate tapered roller bearings are located in a front hub assembly on a front-wheel-drive vehicle, the wheel bearing endplay adjustment is provided by:

Accepted Answer

The hub nut torque provides the adjustment for wheel bearing endplay in front hub assemblies with two separate tapered roller bearings.

Question 5

All of the following statements are correct EXCEPT:

Accepted Answer

The National Lubricating Grease Institute (NLGI) does set standards for the classification and testing of greases, but the statement that is incorrect among the options provided is not related to the NLGI's role. The incorrect statement is actually about greases being named for their thickening agent, which is a simplification. Greases can be classified or named based on various factors including their thickening agent, but also on their base oil type, additives, and intended application.

Question 6

What type of loads can be carried by a tapered roller bearing?

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Question 7

When must an integral wheel bearing hub assembly be replaced?

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Question 8

The front wheel bearings are being replaced on a front-wheel-drive vehicle with the wheel bearings pressed into the steering knuckle. Technician A says the vehicle should be driven a short distance in the shop before the front hub nuts are torqued to specifications. Technician B says the hub nut torque supplies the correct wheel bearing adjustment. Who is correct?

Accepted Answer

Technician B is correct. The torque applied to the hub nut is what sets the proper preload for the wheel bearings. Driving the vehicle before torquing the hub nut is unnecessary and can actually cause incorrect bearing preload.

Question 9

What are the two most important factors for tapered roller bearing performance and longevity?

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Question 10

List common lip seal designs.

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Question 11

Repeated rear axle seal failure occurs in a rear-wheel-drive vehicle. Technician A says the axle shaft may be scored in the seal contact area. Technician B says the axle housing may be distorted in the seal mounting area. Who is correct?

Accepted Answer

Both Technician A and Technician B could be correct. It is possible for the axle shaft to be scored in the seal contact area, leading to repeated seal failures. Similarly, if the axle housing is distorted in the seal mounting area, it could result in seal failure. Therefore, both technicians may be correct in identifying potential causes for repeated rear axle seal failure.

Question 12

A cylindrical ball bearing is designed primarily to withstand what type of loads?

Accepted Answer

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Question 13

A tapered roller bearing has:

Accepted Answer

Tapered roller bearings have excellent ability to carry radial, thrust, and angular loads, making them suitable for various applications such as automotive and industrial equipment. They are not limited to sub-compact vehicle front axles and can carry both radial and thrust loads.

Question 14

What are bearings designed to do?

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Question 15

What are the three types of loads a bearing may be subjected to?

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Question 16

When are seals without garter springs used?

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Question 17

A front-wheel-drive vehicle has a clicking noise in the front of the vehicle when cornering below 20 mph. The front end of the vehicle is lifted and supported on safety stands. With the right front lower control arm lifted with a floor jack, the clicking noise is heard, but with both front wheels dropped downward, the noise disappears. Technician A says the right-front outer drive axle joint is worn. Technician B says a worn inner drive axle joint could cause a vibration during acceleration. Who is correct?

Accepted Answer

The clicking noise when cornering at low speeds is a classic symptom of a worn outer CV (constant velocity) joint, supporting Technician A's diagnosis. Technician B's statement that a worn inner drive axle joint could cause vibration during acceleration is also correct, as inner CV joint wear can lead to imbalance and vibration under load.

Question 18

There is a growling noise coming from the right-rear of a front-wheel-drive vehicle. The noise is more pronounced on left turns. What is the most likely cause?

Accepted Answer

A growling noise from the rear of a front-wheel-drive vehicle that is more pronounced on left turns is a classic symptom of a worn right rear wheel bearing. This is because the weight shifts to the outer edge of the right rear wheel during left turns, putting more pressure on the worn bearing and making the noise more noticeable.

Question 19

A spring-loaded seal compensates for ALL of these conditions EXCEPT:

Accepted Answer

Spring-loaded seals are designed to maintain sealing contact and compensate for conditions like seal lip wear, shaft movement, and bore eccentricity. However, they do not compensate for wear in the seal bore and housing itself.

Question 20

What type of load will the front wheel bearings carry when a vehicle is turning a corner?

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Quiz 4: Wheel Bearings