Chevrolet Sonic Repair Manual: Tire and Wheel Assembly Balancing - On-Vehicle
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 in an attempt to finish balance the tire and wheel assemblies, wheel hubs, brake rotors, brake drums, if equipped, and wheel trim, if equipped, simultaneously. On-vehicle balancing can also compensate for minor amounts of residual runout encountered as a result of mounting the tire and wheel assembly on the vehicle, as opposed to the balance which was achieved on the off-vehicle balancer.
In order to perform an on-vehicle balancing procedure, carefully follow the on-vehicle balancer manufacturer's specific operating instructions and carefully consider the following information before proceeding:
- Vehicles equipped with low profile, wide tread path, high performance tires and wheels are susceptible to small amounts of dynamic imbalance.
- 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.
- Inspect the vehicle wheel bearings to ensure that they are in good condition.
- Thoroughly inspect all on-vehicle balancing equipment and ensure that it is fully within the manufacturer's recommended specifications.
- 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.
- Leave all wheel trim installed whenever possible.
- 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.
- 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.
Tire and Wheel Assembly Balancing - Off Vehicle
Warning: Failure to adhere to the following precautions before tire
balancing can result in personal injury or damage to components:
Clean away any dirt or deposits from the inside of the ...
Tire and Wheel Assembly Runout Measurement - Off Vehicle
Raise and support the vehicle.
Mark the location of the wheels to the wheel studs and mark the specific
vehicle position on each tire and wheel – LF, LR, RF, RR.
Remove the tire and wheel ...
Other materials:
Lower Anchor and Top Tether Anchor Locations
(Top Tether Anchor): Seating positions
with top tether anchors.
(Lower Anchor): Seating positions
with two lower anchors.
To assist in locating the lower anchors, each seating position with lower anchors
has two labels, near the crease between the seatback and the seat cushion.
To ass ...
Air Conditioning Compressor Oil Balancing
Draining Procedure
Note: Drain and measure as much of the refrigerant oil as
possible from the removed compressor.
Drain the oil from both the suction and discharge ports of the removed
compressor into a clean, graduated container. Rotate the compressor sha ...
Heater Core Replacement
Heater Core Replacement
Callout
Component Name
Preliminary Procedures
Remove the Heater and Air Conditioning Evaporator and Blower Module.
Refer to Heater and Air Conditioning Evaporator and Blower Module Removal
and Inst ...
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