Tire and Wheel Assembly Balancing - On-Vehicle
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Tire and Wheel Assembly Balancing - On-Vehicle
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Special Tools
EL-38792-A
Electronic Vibration Analyzer (EVA) 2
If after following the tire and wheel vibration diagnostic process, some amount of tire and wheel vibration is still evident, an on-vehicle high-speed spin balancer may be used to perform an on-vehicle balance. This can contribute to a definitive and simultaneous balancing of wheels and tires, wheel hubs, brake disks, brake drums where fitted, and wheel trims (if fitted). Balancing on the car can, in contrast to freestanding balancing machines, also compensate for minor runout which occurs on mounting the wheel on the car.
In order to perform an on-vehicle balancing procedure, carefully follow the on-vehicle balancer manufacturer's specific operating instructions. Consider the following information before proceeding:
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Vehicles equipped with low profile, wide tread path, high performance tires and wheels are susceptible to small amounts of dynamic imbalance.
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When performing an on-vehicle balance, great care must be taken when placing the wheel balance weights on the wheels. If the wheel balance weights are not placed accurately, they can actually induce dynamic imbalance and thus increase the severity of the vibration.
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Inspect the vehicle wheel bearings to ensure that they are in good condition.
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Thoroughly inspect all on-vehicle balancing equipment and ensure that it is fully within the manufacturer's recommended specifications.
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Do not remove the off-vehicle balance weights. The purpose of on-vehicle balance is to fine tune the assembly balance already achieved off-vehicle, not to start over.
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Leave all wheel trim installed whenever possible.
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If the on-vehicle balancer calls for more than 56 g (2 oz) of additional weight, split the weight between the inboard and outboard flanges of the wheel, so as not to upset the dynamic balance of the assembly achieved in the off-vehicle balance. For wheel balance weight information, refer to
Tire and Wheel Assembly Balancing - Off Vehicle
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If available, tape-off an area on top of the fenders and the quarter panels, then place the vibration sensor of the
EL-38792-A
Electronic Vibration Analyzer (EVA) 2 on the fender or quarter panel above the specific tire and wheel assembly while it is being on-vehicle balanced.
The
EL-38792-A
Electronic Vibration Analyzer (EVA) 2 will provide a visual indication of the amplitude of the vibration, and the effect that the on-vehicle balance has on it.
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