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Tires.
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Road surfaces.
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Wheel bearings.
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Engine.
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Exhaust system.
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These noises may vary according to the:
Size of the vehicle.
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Type of the vehicle.
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Amount of insulation used in the body of the vehicle.
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Transaxle Noise
Transaxle gears, like any mechanical device, are not absolutely quiet and will make some noise during normal operation.
To verify suspected transaxle noises:
1. Select a smooth, level asphalt road to reduce tire and resonant body noise.
1. Select a smooth, level asphalt road to reduce tire and resonant body noise.
2. Drive the vehicle far enough to warm up all the lubricants thoroughly.
2. Drive the vehicle far enough to warm up all the lubricants thoroughly.
3. Record the speed and the gear range of the transaxle when the noise occurs.
3. Record the speed and the gear range of the transaxle when the noise occurs.
4. Check for noises with the vehicle stopped, but with the engine running.
4. Check for noises with the vehicle stopped, but with the engine running.
5. Determine if the noise occurs while the vehicle operates in:
5. Determine if the noise occurs while the vehicle operates in:
Drive - under a light acceleration or a heavy pull.
Drive - under a light acceleration or a heavy pull.
o
o
Float - maintaining a constant speed with a light throttle on a level road.
Float - maintaining a constant speed with a light throttle on a level road.
o
o
Coast - with the transaxle in gear and the throttle partly or fully closed.
Coast - with the transaxle in gear and the throttle partly or fully closed.
o
o
All of the above.
All of the above.
o
o
Bearing Noise
Differential Side Bearing Noise
Differential side bearing noise and wheel bearing noise can be confused easily. Since side bearings are preloaded, a differential side bearing noise
should not diminish much when the differential/transaxle is run with the wheels off the ground.
Wheel Bearing Noise
Wheel bearings produce a rough growl or grating sound that will continue when the vehicle is coasting and the transaxle is in NEUTRAL.
Since wheel bearings are not pre-loaded, a wheel bearing noise should diminish considerably when the wheels are off the ground.
Other Noise
Brinelling
A brinelled bearing causes a "knock" or "click" approximately every second revolution of the wheel because the bearing rollers do not travel at the
same speed as the wheel. In operation, the effect is characterized by a low-pitched noise.
A brinelled bearing is caused by excessive thrust which pushes the balls up on the pathway and creates a triangularshaped spot in the bearing
race. A brinelled bearing can also be caused from pressing one race into position by applying pressure on the other race.
A false indication of a brinelled bearing occurs as a result of vibration near the area where the bearing is mounted. Brinelling is identified by
slight indentations, resulting in a washboard effect in the bearing race.
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