GMC chevrolet camaro 2000 Service Manual page 69

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0-58 Vibration Diagnosis and Correction
Strobe Balance Testing with the Electronic
Vibration Analyzer (EVA)
Ensure that the runout of the various driveline
components are within specifications. If the runouts
are within specifications, strobe balance the driveline.
The EVA is able to simplify the.balancing process,
using the following procedure:
1 . Use the EVA in order to determine which end of
the propeller shaft has the most vibration.
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2
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2. Mark the end of the propeller shaft (1) that has
the most vibration at four points (2), 90 degrees
apart. Number the marks 1 through 4.
3. Mount the EVA sensor onto the bottom of the
following components:
• The differential housing
.. The center bearing support (for 2-piece
propeller shafts that use a center bearing
support)
• The transmission tailshaft assembly
General Information
4. Position the sensor as close to the propeller shaft
as possible. Verify that the following
conditions exist:
• The UP side of the sensor faces upward.
• The sensor is horizontal.
5. Start the engine.
6. Turn OFF all of the engine accessories.
7. Place the transmission iri gear.
8. Run the vehicle at the speed which causes the
most. vibration in the propeller shaft.
9. Hook the timing light clip to the trigger wire.
10. Plug the vibration sensor into Input A of the EV A.
Input B is not applicable for this test.
11. Verify that the predominant frequency on the EVA
display matches the frequency of the original
vibration. Use the strobe light only if the rotation
speed of the propeller shaft is the predominant
frequency.
12. The EVA displays a series of questions inorder to
select the correct filter. Press YES in order to
select the desired filter. Ensure that the frequency
is in the middle of the filter range. Use the full
range only as a last resort.
13. The display shows the test frequency, the
amplitude and the filter range. The driveline
is balanced when the amplitude is near 2. In some
cases, a slightly higher amplitude will provide
adequate balance.
14. Point the timing light at the propeller shaft. The
strobe effect will appear to freeze the propeller
shaft. Remember which of the numbered marks is
at the bottom of the propeller shaft, or the
six o'clock position. This position is the light spot.
15. Turn the engine OFF.
16. Install a weight directly on the light spot.
17. Start the engine.
18. Run the vehicle at peak vibration speed.
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