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:
Hill Start Assist (HSA)
This vehicle has an HSA feature, which may be useful when the vehicle is stopped
on a grade. This feature is designed to prevent the vehicle from rolling, either
forward or rearward, during vehicle drive off. After the driver completely stops
and holds the vehicle in a complete standstill on a ...
Crankshaft Sprocket Replacement
Crankshaft Sprocket Replacement
Callout
Component Name
Preliminary Procedure
Remove the timing belt. Refer to Timing Belt Replacement.
1
Crankshaft Sprocket
Procedure
When installing the cran ...
Engine Oil Cooler Disassemble
Remove the oil cooler coolant inlet hose clamp (2).
Remove the oil cooler coolant inlet hose (1).
Remove the oil cooler coolant inlet pipe bolt (7)
Remove the oil cooler coolant inlet pipe (3) and the seal ring (6).
Remove the oil cooler coolant out ...
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