Caution: 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 wheels. • Remove any stones from the tread. • Wear eye protection. • Use coated weights on aluminum wheels.
Tire and wheel balancer can drift out of calibration over time, or can become inaccurate as a result of heavy use. There will likely not be any visual evidence that a calibration problem exists. If a balancer is not calibrated within specifications, and a tire and wheel assembly is balanced on that machine, the assembly may actually be imbalanced.
If the tire and wheel assembly balancer is used frequently, and/or whenever the balance readings are questionable, and then the calibration should be checked approximately every 2 weeks.
Important: If the balancer fails any of the steps in this calibration test, the balancer should be calibrated according to the manufacturer's instructions. If the balancer cannot be calibrated, contact the manufacturer for assistance.
Check the tire and wheel assembly balancer calibration according to the manufacturer's recommendations, or perform the following test.
Specification
Zero within 7 g (¼ oz)
• | In the static and dynamic modes, the balancer should add 85 g (3 oz) weight, 180 degrees opposite the test weight location. |
• | In the dynamic mode, the weight should be added to the wheel flange of the opposite the test weight. |
Specification
Maximum variation: 7 g (¼ oz)
Specification
Maximum variation: 7 g (¼ oz)
Important: Tire and wheel assemblies which exhibit excessive runout can produce vibrations even if the assemblies are balanced.
It is strongly recommended that the tire and wheel assembly runout be measured and corrected if necessary BEFORE the assemblies are balanced.If the runout of the tire and wheel assembly has not been measured, refer to Tire and Wheel Assembly Runout Measurement - Off Vehicle BEFORE proceeding.
There are 2 types of tire and wheel balance:
Static balance is the equal distribution of weight around the wheel circumference. The wheel balance weights (2) are installed at the wheel to offset the effect of a heavy spot. (3) Wheels that have static imbalance can produce a bouncing action called tramp.
Dynamic balance is the equal distribution weight on each side of the tire and wheel assembly centerline. The wheel balance weights (2) are installed at the wheel to offset the effect of a heavy spot. (3) Wheels that have dynamic imbalance have a tendency to move from side to side, and cause an action called shimmy.
Most Off-vehicle balancer are capable of checking both types of balance simultaneously.
Generally, most vehicles are more sensitive to static imbalance than to dynamic imbalance, however, vehicles equipped with low profile, wide tread path, high performance tires and wheels are susceptible to small amounts of dynamic imbalance. As little as 14-21 g (½-¾ oz) imbalance is capable of causing vibration in some vehicle models.
Important: When balancing tire and wheel assemblies, use a KNOWN GOOD, recently calibrated, off-vehicle, two-plane dynamic balancer, and set it to the finest balance mode.
Regard aftermarket wheels, especially those incorporating universal lug patterns, as potential sources of runout and mounting concerns.
Tire and wheel assemblies can be balanced using either the static or dynamic method.
Important: When balancing factory aluminum wheels with clip-on wheel balance weights, be sure to use special polyester-coated weights. These coated weights reduce the potential corrosion and damage to aluminum wheels.
These coated weights reduce the potential corrosion and damage to aluminum wheels.
• | MC (1) and AW (2) series weights are approved for use on aluminum wheels. |
• | P (3) series weights are approved for use on steel wheels only. |
• | T (4) series coated weights are approved for use on both steel and aluminum wheels. |
Important: Use a nylon or plastic-tipped hammer when installing coated polyester wheel weights, to minimize the possibility of damage to the polyester coating.
The contour and type of the wheel rim flange will determine which type of clip-on wheel weight (1) should be used. The weight should follow the contour of the rim flange. The weight clip should firmly grip on the rim flange.
When static balancing, locate the wheel balance weights on the inboard flange (2) if only 28 g (1 oz) or less is needed. If more than 28 g (1 oz) is needed, split the weights as equally as possible between the inboard (2) and outboard (1) flanges.
When dynamic balancing, locate the wheel balance weights on the inboard (2) and outboard (1) rim flanges at the positions specified by the wheel balancer.
Important: When installing adhesive balance weights on flangeless wheels, do NOT install the weight on the outboard surface of the rim.
Adhesive weights can be used on factory aluminum wheels. Perform the following procedure to install adhesive wheel balance weights.
• | When static balancing, locate the wheel balance weights along the wheel centerline (1) on the inner wheel surface if only 28 g (1 oz) or less is needed. If more than 28 g (1 oz) is needed, split the weights as equally as possible between the wheel centerline and the inboard edge of the inner wheel surface (2). |
• | When dynamic balancing, locate the wheel balance weights along the wheel centerline and the inboard edge of the inner wheel surface (2) at the positions specified by the wheel balancer. |
Important: Do not use abrasives to clean any wheel surface .