Description And Operation; Basic Terms - GMC chevrolet camaro 2000 Service Manual

General Information
3. Adhesive wheel weights are also available. Use
the following procedure in order to install adhesive
wheel weights.
3.1 . Determine where the wheel weigh is to be
located on the inboard side of the wheel.
3.2. Clean that area by sanding to bare
aluminum. Do NOT sand the outboard
side of the wheel as this will damage the
clear coat finish.
3.3. Wipe the sanded area with a mixture of half
ispopropyl alcohol and half water. Use a
clean cloth or paper towel.
3.4. Dry the area with hot air until the wheel
surface is warm to the touch.
3.5. Warm the adhesive backing on the wheel
balance weight to room temperature.
3.6. Remove the tape from the back of the
weight. Do not touch the adhesive tape.
3.7. Apply the wheel weight and press on with
hand pressure. ·
3.8. Secure the wheel weight .with a 70-11 O N·m
· (16..:.25 lb ft) force applied with a roller.
Description and Operation
) Basic Terms·.
The following are the two primary components of
vibration diagnosis:
• The physical properties of objects
• The object's properties of conducting mechanical
energy
The repetitive up/down or back/forth movement of a
component causes most customer vibration
complaints. The following are the components that
often vibrate:
• The steering wheel
• The seat cushion
• The frame
• The instrument panel
Vibration diagnosis involves the following steps:
1. Measure the repetitive motion and assign a value
to the measurement in cycles per second or
cycles per minute. ·
2. Relate the frequency to the rotational.speed of a
component that is operating at the same rate
or speed,
3. Inspect and test the components for conditions
that cause vibration.
Vibration Diagnosis and Correction 0-73
For example, performing the following steps will help
demonstrate the vibration theory:
95587
1. Clamp a yardstick to the edge of a table, leaving
about 50 cm (20 in) hanging over the edge of
the table.
2. Pull down on the edge of the stick and. release
while observing the movement of the stick.
The motion of the stick occurs in repetitive cycles. The
cycle begins at midpoint, continues through the
lowest extreme of travel, then back past the midpoint,
through the upper extreme of travel, and back to
the midpoint where the cycle begins again.
The cycle occurs over and over again at the same
rate, or frequency. In this case, the frequency is about
10 cycles per second. If we measure the. frequency
to reflect the number of complete cycles that the
yardstick made in one minute, the measure would be
1 O cycle~ x 60 seconds = 6QO cycles per minute (cpm).
We could have also found a specific amount of
motion,· or amplitude, in the total travel of the yardstick
· from the very top of the cycle to the very bottom of
the cycle. Redo the experiment as follows:
1. Reclamp the yardstick to the edge of a table,
leaving about25 cm (10 in) hanging over the
edge of the table.
'2. PuU down on the edge of the stick and release
while observing the movement of the stick.
The stick vibrates at a much faster frequency:
30 cycles per second (1800 cycles per minute). The
total travel, or amplitude, is less.