GMC Chevrolet Camaro 1998 Service Manual page 63

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General Information
Vibration Diagnosis and Correction 0-51
Calculating Tire Rotation
TIRE/WHEEL ROTATION WORKSHEET
Vehicle Information
Co.mplaint Speed: _ _ _ _ _ _ _
mph
Year: _ _ _ _ _ _ _ _ Model: _ _ _ _ _ _ _
VIN:
- - - - - - - - - - - - - - - - - -
Symptom: _ _ _ _ _ _ _ _ _ _
Frequency: _ _ _ _ _ _ _ _ _ _
Engine: _ _ _ _ _ _ _ _ T r a n s : - - - - - - -
Tire Size: Axle Ratio:
-----
Engine Speed: _ _ _ _ _ _ _ _
rpm
TPC Spec: _ _ _ _ _ _ _ _ _ _ _ _ _ _
Gear:
- - - - - - - - - - - -
Tire/Wheel Speed
Vibration
D
mph
+
8 (km/h) 5 (mph)
::,
increments of 8 km/h
/Smph
Occurs at:
8 km/h
D
xo
/5 mph
increments
1st order
D
x
2
1st order
D
x
3
*RPS ~utions. per sBCOndi et1uates 10 cydes per second (Hz").
Determine the rotational speed of the tires in
revolutions per second, or Hertz (Hz), based on the
vehicle speed at which the Vibration occurs. In order to
determine the rotational speed, follow this procedure:
1 . Determine the complaint speed - the vehicle
speed at which the vibration occurs.
2. Determine the number of 8 km/h (5 mph)
increments:
• Divide the complaint speed by 8 when
using km/h.
• Divide the complaint speed by 5 when
using mph.
3. Determine the vehicle tire size.
4. Locate on the table below, the Hertz value at
8 km/h (5 mph) for that tire size.
Tire/Wheel Speed,
RPS (Hz)
tire RPS
11
=
CJ
1st order
at B km/h
/Smph
(from table)
;;;;;
CJ
2nd order
=
CJ
3rdorder
95609
5. Multiply the Hertz value by the number of 8 km/h
(5 mph) increments.
6. The result is the rotational speed of the tires in
Hertz at the complaint speed. If this figure
matches the vibration frequency, a first-order
vibration is present in the tire and wheel assembly.
Tire/Speed Table
Revs/Sec
Tire Size Tread at 5 MPH
P235/55R16 ALS 1.066
P245/50R16 AL2
1.079
P275/40R17 AL2 1.100
AL2 Touring
ALS All Season