Chapter 48: Wheel Bearings
One way to isolate a wheel bearing noise from a transmission noise is to drive the vehicle at the speed at which it is making the noise and then shift into a higher or lower transmission gear while _______.
Maintaining the same speed
Some wheel bearing failures involve the races spinning in either the machined bore of the wheel hub or on the surface of the spindle/axle. True or False?
True
Wheel bearings can be damaged from excessive loads. True or False?
True
______ play a critical role in the vehicle by allowing the wheels to roll with a minimum of friction while still maintaining accurate wheel positioning under all driving conditions.
Wheel bearings
Most automotive axle seals typically consist of all of the following EXPECT: - stamped sheet metal case - flexible seal lip - garter spring - tongue-and-groove spring
tongue-and-groove spring
All of the following can be caused by a loose or worn wheel bearing, EXPECT: - vehicle wander - vehicle engine oil leak - vehicle shimmy - vehicle vibration
vehicle engine oil leak
The component in a wheel bearing that maintains the proper spacing between the roller bearings or ball bearings is called a(n) __________.
Bearing cage
A _____ is a tool that forces grease into the spaces between the bearing rollers.
Bearing packer
Serviceable wheel bearings should be serviced periodically only if a faulty wheel bearing is suspected. True or False?
False
Maintenance is commonly performed during brake shoe/pad replacement or at intervals specified by the vehicle manufacturer, usually around.
24,000 to 30,000 miles
At what positions is it best to grab the tire and lift the wheels off the ground to check the wheel bearings for looseness?
6 o'clock and 12 o'clock
If a vehicle uses serviceable bearings, the maximum allowable play is approximately ________.
0.010"
Which component of wheel bearing holds the rollers or balls in place?
A bearing cage
Which of the following is a method of diagnosing wheel bearing assemblies? Select one? - Wiggling the tire - Test-driving - Rotating the Wheel - All of the above
All of the above
Which of the following id NOT a common tool used to maintain and repair wheel bearings? Select one: - Bore gauge - Seal puller - Cotter pin removal tool - Dust cap pliers
Bore gauge
It can be challenge is to distinguish between a wheel bearing noise and a tire noise. The best approach to this problem is to drive over different road surfaces. Tech A states that if the nosie changes, it is likely a tire problem. Tech B states that if the noise does not change, it it likely to be a faulty wheel bearing. Who is correct?
Both A and B
Tech A says that unitized hubs have a wheel nut with a higher installation torque than serviceable wheel bearings. Tech B says that unitized hubs have the proper bearing end playing designed into the assembly once they are torqued. Who is correct ?
Both A and B
Technician A says that wheel bearings can be damaged from hitting a large pothole. Technician B says that wheel bearings can be damaged from improper adjustment. Who is correct?
Both A and B
Technician A says that sealed bearing assemblies are prefilled with lubricant and have integrated grease seals built into them. Technician B says that sealed bearing assemblies makes for more reliable and consistent installation process since every unit comes preset at the proper clearance. Who is correct?
Both Technician A and Technician B
Tech A says that the wheel bearing grease seal is designed to contain the lubricant. Tech B says that the wheel bearing grease seal is designed to keep out contaminats. Who is correct?
Both Techs A and B
The drums are free to rotate with the wheels due to the wheel bearings _______. Select one: - In the hub - On the axle - Both of the above - None of the above
Both of the above
Technician A says that servicing the wheel bearings. Technician B says that if the vehicle uses non-serviceable bearings, the bearings should be checked during a brake job and replaced if they are worn out. Who is correct?
Both tech A and B
All wheel bearings used to be serviceable type, requiring periodic maintenance every 24,000-30,000 miles (38,624-48,280 km), consisting of disassembly, cleaning, inspecting, reassembly, and adjusting. True or False?
True
Cylindrical roller bearing assemblies require lubrication to cushion the rollers and races while operating. True or False?
True
In a full floating axle, the weight of the vehicle is fully carried by a pair of tapered roller bearing assemblies, which ride between the hub and axle tube. True or False?
True
In some applications, the grease seal is a press-fit into the axle housing, which is stationary, and seals against the axle shaft, which is rotating. True or False?
True
Tech A says that the twp different types of lubricants used to lubricate bearings cannot be substituted due to the different housing and seal designs each lubricant demands in a vehicle. Tech B says that the two different types of lubricants used to lubricate bearings can be substituted due to the different housing and seal designs each lubricant demands in a vehicle. Who is correct?
Tech A
Technician A says that a unitized wheel bearing hub usually needs to be pressed into place by the technician. Technician B says that wheel bearings can be damaged from improper adjustment. Who is correct?
Technician B
All of the following statements with respect to lubricants and their application are true EXPECT: - Gear lube is somewhat thicker than engine oil - The level of gear lube should normally be within 0.25" (6.35 mm) of the bottom of the fill plug hole - The higher the viscosity number, the thinner the gear lube - A bearing packer is a tool that forces grease into the spaces between the bearing rollers
The higher the viscosity number, the thinner the gear lube
Lithium soap is a common thickening agent in automotive grease. True or False?
True
Packing a bearing assembly should be done only after thoroughly cleaning and inspecting the rollers and races for wear, damage, or corrosion. True or False?
True
