Audi A3 Wheel Bearing and Hub Assembly (Rear) - rear hub bearing assembly
When thinking about your bearing tolerance strategy, you want to avoid two common issues, raceway slippage and inner race lift off.
Designed with grooves in the outer ring to offer more protection (than our L-type seal) against contamination and direct spray liquids. Liquid gets pushed out through outer grooves when in rotation.
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Finding the right shaft OD to match the ID of the bearing and the correct housing ID to match the OD of the bearing (at room temperature), produces the resultant fit.
Wheelbearing noisewhen driving
As the engine moves from the effects of torque and as the suspension of a vehicle travels up and down, the angle of the driveshaft changes.
Wheelbearing noisequick fix
Machined parts and components all have tolerance standards when manufactured. This standard produces a consistent, uniform product.
Precision bearings have a tolerance on the inner diameter (ID) and the outer diameter (OD), and machined shaft and housings also have tolerance standards on their parts. These tolerances adjust with the temperature.
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Wheel bearing play can be measured with a dial indicator by placing the dial indicator against the hub and rocking the wheel in and out by hand. As a rule, you should see no more than .005” of play in the bearings if the bearings are good, but some specifications are so low that you can’t feel any play and won’t be able to measure it with a dial indicator. The improper installation of an axle nut is one of the most common causes wheel bearing comebacks. Most axle nuts should not be reused. If an old nut is used, it could work loose and destroy the preload of the bearing. When the preload is lost, the bearing will make a low frequency grumble. You can retighten the axle nut to see if the noise remains. Sometimes the noise will go away, but in some cases, the permanent bearing damage has already occurred.
While there are no set specifications for noise or standardized mounting points for the listening device, it can allow you to compare the bearing on each side and compare while on a test drive. These devices can also allow you to eliminate components that could be the source of cyclical noises like CV joints, brakes and differentials.
Within this scenario, it’s a reasonable assumption to use an ID running temperature of ~41°C [106°F], i.e. 10°C above the housing temperature. The bearing will expand by ~6 microns on the OD and a 7075 AL housing will expand ~11 microns.
Race rotation relative to the shaft and/or housing can cause premature bearing failure. Therefore, higher RPM applications require a heavier shaft to inner race press fit (assuming the application is shaft rotation).
The improper installation of an axle nut is one of the most common causes wheel bearing comebacks. Most axle nuts should not be reused. If an old nut is used, it could work loose and destroy the preload of the bearing. When the preload is lost, the bearing will make a low frequency grumble. You can retighten the axle nut to see if the noise remains. Sometimes the noise will go away, but in some cases, the permanent bearing damage has already occurred.
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Includes built-in ball bearing support. Supports MEDIUM loads & low to medium torque capacity: 53 to 267 Nm. Bore (ID) sizes: 17 to 40 mm (0.669 to 1.57 in)
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Wheelbearingknockingnoise
During operation, temperatures rise causing the bearings, shaft and housing to expand. Being prepared for these changes, when machining a shaft and housing unit, will ensure that you are choosing the correct bearing and fit for your application.
Tires can cause cyclical noise if the bands have shifted or if there is a road force imbalance. Uneven wear due to alignment issues is another factor for noise. Worn or failed bushings can also cause cyclical noise to be transferred to the body and frame.
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A popping or clicking noise when turning is a classic symptom of a bad outer CV joint. Also note the condition of the CV joint boot. If the boot is torn or leaking, it should be replaced regardless of the condition of the joint. If the CV joint is noisy, it needs to be replaced.
Includes built-in ball bearing support. Supports HEAVY loads & has a high torque capacity: 53 to 588 Nm. Bore (ID) sizes: 10 to 60 mm (0.393 to 2.362 in)
In many circumstances the inner race press fit needs to be higher than the above tables. Be careful, because too much press fit can decrease the contact angle on an angular contact bearing.
On applications where the shaft is rotating, using a press fit will prevent inner ring rotation, relative to the shaft, that could result in micro-fretting and premature bearing failure.
This heavy-duty clutch (aka a hold-back clutch) is good for high torque operations and ensures motion freezes in place. Bore (ID) sizes: 15 to 40 mm. (0.59 to 1.73 in)
Wheelbearing noisedangerous
The noise can also be misleading. A caliper that’s sticking or a brake pad that’s loose and dragging may make a metallic scraping noise as it rubs against the brake rotor. The frequency of the noise will also change in proportion to vehicle speed, but will often go away or change when the brakes are lightly applied. Noise that only occurs when braking is likely a brake problem such as worn pads, not a bad wheel bearing.
For high-speed applications, centrifugal force could cause the inner ring to expand and lift off the shaft. This may result in drastic machine malfunctions and a decrease in the life of the bearing. Increasing the press fit would help counteract this scenario.
Typical shaft and housing tolerance ranges are around 10µm but establishing the correct tolerances for the shaft and housing is important for achieving optimal performance in your application.
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A good press fit target, for a given speed (RPM), in our angular contact S Series is below. Look at these numbers as the median of the resultant press fit or to offset the ISO 1101 numbers in the higher press direction.
Bad wheelbearing noise
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Wheel bearing noises tend to travel through the drivetrain and exit through a transmission or engine mount that’s “grounding” the noise from the drivetrain to the chassis. This grounding effect causes a wheel bearing noise to be transferred far from its point of origin. For these and other reasons, it’s often very difficult to detect the early stages of wheel bearing failure.
No built-in ball bearing support. Has no RPM limits & Supports high torque needs: 609 to 14,060 Nm. Bore (ID) sizes: 38.09 to 220 mm (1.499 to 8.66 in)
The classic symptom of a bad wheel bearing is typically a cyclic chirping, squealing or growling noise that changes in proportion to vehicle speed. The sound may disappear at some speeds or only occur at certain speeds. The noise may get worse when turning, or it may disappear momentarily. So, it’s difficult to make a diagnosis based on noise alone. Related Articles - Hydraulic Suspension Bushings - Brake Problems - Electric Power Steering Evolution Misdiagnosis The noise can also be misleading. A caliper that’s sticking or a brake pad that’s loose and dragging may make a metallic scraping noise as it rubs against the brake rotor. The frequency of the noise will also change in proportion to vehicle speed, but will often go away or change when the brakes are lightly applied. Noise that only occurs when braking is likely a brake problem such as worn pads, not a bad wheel bearing. Tires can cause cyclical noise if the bands have shifted or if there is a road force imbalance. Uneven wear due to alignment issues is another factor for noise. Worn or failed bushings can also cause cyclical noise to be transferred to the body and frame. Wheel bearing noises tend to travel through the drivetrain and exit through a transmission or engine mount that’s “grounding” the noise from the drivetrain to the chassis. This grounding effect causes a wheel bearing noise to be transferred far from its point of origin. For these and other reasons, it’s often very difficult to detect the early stages of wheel bearing failure. If the growling noise were more noticeable in a specific gear range, a worn bearing in the transmission would generally cause the bearing noise. If the bearing noise is constant regardless of acceleration or deceleration and is approximately three times wheel speed in frequency, the faulty bearing would generally be found on the transmission output shaft or the driveshaft intermediate support bearing. Wheel bearing hub unit. A popping or clicking noise when turning is a classic symptom of a bad outer CV joint. Also note the condition of the CV joint boot. If the boot is torn or leaking, it should be replaced regardless of the condition of the joint. If the CV joint is noisy, it needs to be replaced. Some worn wheel bearings can often be detected by rocking the vehicle from side to side at low speeds with the steering wheel. This technique tends to increase the load on the bearings, causing the pitted bearing to become noisier than usual. This test works better when the vehicle is warm and in a parking area or roadway with light traffic. One tool that is helpful in diagnosing wheel bearings is a wired or wireless microphone/stethoscope that can be attached to a knuckle. Once an engineer-only tool, the prices for these microphone/stethoscopes have dropped dramatically. While there are no set specifications for noise or standardized mounting points for the listening device, it can allow you to compare the bearing on each side and compare while on a test drive. These devices can also allow you to eliminate components that could be the source of cyclical noises like CV joints, brakes and differentials. On the Lift To check for play, raise the vehicle so the wheel is off the ground, then grab the tire at the 12 and 6 o’clock positions and move it back and forth. As a rule, you should not feel any play or looseness if the vehicle has sealed wheel bearing cartridges or hubs with sealed wheel bearing assemblies. On older vehicles with serviceable wheel bearings, a little play is normal, but a lot of play is not. Refer to the vehicle’s service specifications for the maximum amount of acceptable play. Wheel bearing play can be measured with a dial indicator by placing the dial indicator against the hub and rocking the wheel in and out by hand. As a rule, you should see no more than .005” of play in the bearings if the bearings are good, but some specifications are so low that you can’t feel any play and won’t be able to measure it with a dial indicator. The improper installation of an axle nut is one of the most common causes wheel bearing comebacks. Most axle nuts should not be reused. If an old nut is used, it could work loose and destroy the preload of the bearing. When the preload is lost, the bearing will make a low frequency grumble. You can retighten the axle nut to see if the noise remains. Sometimes the noise will go away, but in some cases, the permanent bearing damage has already occurred.
In rotating shaft applications, we recommend achieving a press fit between the shaft and the ID of the bearing and a slip fit between the housing and the OD of the bearing.
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Front wheelbearing noisesymptoms
No built-in ball bearing support. Good for large orders & low to high torque needs: 1 to 2673 Nm. Bore (ID) sizes: 2 to 240 mm (0.078 to 9.448 in)
Example: An S 6005 C TA A7 UL angular contact bearing is installed at room temperature, ~21°C[70°F]. The running temperature of the application is ~31°C [88°F] at the housing.
Some worn wheel bearings can often be detected by rocking the vehicle from side to side at low speeds with the steering wheel. This technique tends to increase the load on the bearings, causing the pitted bearing to become noisier than usual. This test works better when the vehicle is warm and in a parking area or roadway with light traffic. One tool that is helpful in diagnosing wheel bearings is a wired or wireless microphone/stethoscope that can be attached to a knuckle. Once an engineer-only tool, the prices for these microphone/stethoscopes have dropped dramatically. While there are no set specifications for noise or standardized mounting points for the listening device, it can allow you to compare the bearing on each side and compare while on a test drive. These devices can also allow you to eliminate components that could be the source of cyclical noises like CV joints, brakes and differentials. On the Lift To check for play, raise the vehicle so the wheel is off the ground, then grab the tire at the 12 and 6 o’clock positions and move it back and forth. As a rule, you should not feel any play or looseness if the vehicle has sealed wheel bearing cartridges or hubs with sealed wheel bearing assemblies. On older vehicles with serviceable wheel bearings, a little play is normal, but a lot of play is not. Refer to the vehicle’s service specifications for the maximum amount of acceptable play. Wheel bearing play can be measured with a dial indicator by placing the dial indicator against the hub and rocking the wheel in and out by hand. As a rule, you should see no more than .005” of play in the bearings if the bearings are good, but some specifications are so low that you can’t feel any play and won’t be able to measure it with a dial indicator. The improper installation of an axle nut is one of the most common causes wheel bearing comebacks. Most axle nuts should not be reused. If an old nut is used, it could work loose and destroy the preload of the bearing. When the preload is lost, the bearing will make a low frequency grumble. You can retighten the axle nut to see if the noise remains. Sometimes the noise will go away, but in some cases, the permanent bearing damage has already occurred.
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To check for play, raise the vehicle so the wheel is off the ground, then grab the tire at the 12 and 6 o’clock positions and move it back and forth. As a rule, you should not feel any play or looseness if the vehicle has sealed wheel bearing cartridges or hubs with sealed wheel bearing assemblies. On older vehicles with serviceable wheel bearings, a little play is normal, but a lot of play is not. Refer to the vehicle’s service specifications for the maximum amount of acceptable play.
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The resultant fit (press or gap) the bearing has in operation is what really matters. Because it’s the result of installation, RPM, application temperature and other external application effects such as loads or lubrication.
20241212 — The wheel bearings cost anywhere from $40 to $120 each, depending on the vehicle. You'll have to pay more if you have a larger vehicle like a ...
One tool that is helpful in diagnosing wheel bearings is a wired or wireless microphone/stethoscope that can be attached to a knuckle. Once an engineer-only tool, the prices for these microphone/stethoscopes have dropped dramatically.
If the growling noise were more noticeable in a specific gear range, a worn bearing in the transmission would generally cause the bearing noise. If the bearing noise is constant regardless of acceleration or deceleration and is approximately three times wheel speed in frequency, the faulty bearing would generally be found on the transmission output shaft or the driveshaft intermediate support bearing.
The best protection for your bearing. Easy to install with a simple “drop-in” next to your bearing. No added space needed. CF seals offer 100% sealing efficiency against splashing liquids.
20231012 — Bad Hub Bearing Sound: A damaged wheel bearing can produce a growling or grinding noise, especially during turns. If you hear a deep growl or ...
What does a continuously variable transmission (CVT) mean for technicians and import nameplate shops? On the maintenance side, a CVT transmission requires more or the same frequency of fluid and filter changes as a conventional automatic transmission, and many of the basic procedures are the same. On the diagnostic side, a CVT transmission is less complicated internally than a 6- or 9-speed transmission.