Chevrolet Sonic Repair Manual: Tire and Wheel Balancing (Road Force Variation (RFV))
- ALL wheel/tire assemblies must have a RFV within spec before being mounted on vehicle.
- RFV is unrelated to tire balance.
- RFV is identifying the stiff portion of the tire and determining if it is within spec.
- If RFV is too high, it will result in a vibration condition.
- Do not attempt to measure RFV on tires that have temporary flat spots. If necessary, drive the vehicle to relieve the flat spots.
- Prior to measuring for RFV, the tires must be inflated to the specification on the label.
- Passenger Cars (including Crossover Vehicles) = 18 lbs.
- Truck Tires: (P) - metric = 24 lbs.
(LT) - metric = 35 lbs.
- It is recommended that RFV measurements are made prior to installation of balance weights. Once adequate road force levels have been achieved, move on to balance the assembly.
Important:
If a wheel/tire assembly is not within the RFV specification after match mounting, the tire must be returned to the tire manufacturer. DO NOT install tire/wheel assembly on a vehicle if it exceeds the RFV specification.
Tire and Wheel Balancing (Collet Cone Selection)
Important: Never use the hub cap bore to center the wheel onto
the balancer. The pilot bore (on the hub side of the wheel) is machined
to be concentric to very tight non - standard tole ...
Tire and Wheel Balancing (Wheel Pilot Bore Greasing)
Beginning with MY 2011 vehicle, pilot bore grease should be applied.
To enable this, grease must be applied to the pilot bore to prevent the
wheel from seizing onto the hub.
Refer to Adhesi ...
Other materials:
Wheel Alignment Measurement
Steering and vibration complaints are not always the result of improper alignment.
One possible cause is wheel and tire imbalance. Another possibility is tire lead
due to worn or improperly manufactured tires. Lead/pull is defined as follows: At
a constant highway speed on a typical straight r ...
Heater and Air Conditioning Evaporator and Blower Module Removal and Installation
Heater and Air Conditioning Evaporator and Blower Module Removal and
Installation
Callout
Component Name
Preliminary Procedures
Recover the refrigerant. Refer to Refrigerant Recovery and Recharging.
Drain the cooling sy ...
Transmission Disassemble (Gen 2)
Special Tools
3-9506289 Universal Adapter
R-0007758 Holding Fixture
S-9407198 Differential Bearing Race Wrench
For equivalent regional tools, refer to Special Tools.
Attach R-0007758 holding fixture (2) to the transmission.
Attach R-0007758 holding fixture (2 ...
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