Lincoln Aviator: Driveshaft / General Procedures - Driveshaft Runout and Balancing
Special Tool(s) /
General Equipment
![](images/general_procedures_driveshaft_runout_and_balancing-2437/2324/imagen2_004(35).jpg) |
100-002
(TOOL-4201-C)
Holding Fixture with Dial Indicator Gauge |
Inspection
NOTE:
Driveline vibration exhibits a higher frequency and lower
amplitude then high-speed shake. Driveline vibration is directly related
to the speed of the vehicle and is noticed at various speeds. Driveline
vibration can be perceived as a tremor in the floorpan or heard as a
rumble, hum or boom.
NOTE:
Refer to Specifications in this section for runout specifications.
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NOTE:
Do not make any adjustments before carrying out a
road test. Do not change the tire pressure or the vehicle load.
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Carry out a visual inspection of the
vehicle. Operate the vehicle and verify the condition by reproducing it
during the road test.
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The concern should be directly related to vehicle
road speed. The concern should not be affected by acceleration or
deceleration or could be reduced by coasting in NEUTRAL.
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Refer to: Jacking and Lifting (100-02 Jacking and Lifting, Description and Operation).
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NOTE:
Use a twin-post hoist or a frame hoist with jackstands.
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Inspect the driveshaft for damage,
undercoating or incorrectly seated U-joints. Rotate the driveshaft
slowly by hand and feel for binding or end play in the U-joint trunnions
or CV-joints. Remove the
driveshaft. Clean the driveshaft as necessary. Install a new driveshaft
if damaged. After any corrections or new components are installed,
recheck for the vibration at the road test speed.
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If the vibration persists after inspection, measure the driveshaft runout.
Check
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NOTE:
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Measure and check for the specified maximum
value. Install the Dial Indicator Gauge with Holding Fixture. Rotate the
driveshaft by turning the axle and measure the runout at the front,
center and rear of the driveshaft. Multiple piece driveshaft measure
each section at the front, center and rear.
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If the runout exceeds specifications at the center
of front or center of rear tube section, install a new driveshaft.
Refer to: Specifications (205-01 Driveshaft, Specifications).
Use Special Service Tool: 100-002
(TOOL-4201-C)
Holding Fixture with Dial Indicator Gauge.
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If the front and center is within specifications ,
but the rear runout is not, index-mark the rear runout high point and
proceed to step 2.
Refer to: Specifications (205-01 Driveshaft, Specifications).
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If the runout is within specifications at all
points, recheck for vibration at road test speed. If the vibration
persists, balance the driveshaft. Refer to Driveshaft Balancing in this
procedure.
Refer to: Specifications (205-01 Driveshaft, Specifications).
![](images/general_procedures_driveshaft_runout_and_balancing-2437/2324/imagen2_005(28).jpg) |
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NOTE:
Circular pinion flanges can be turned in 90 degree
or one-fourth increments. Half-round pinion flanges are limited to 2
positions. CV joint pinion flanges that have 6 bolts, can be turned in
60 degree or one-sixth increments. Splined flangeless/plug-on interfaces
can be turned in increments equal to the number of spine teeth of the
interfacing components.
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Index-mark the driveshaft to the pinion seal
lip. Disconnect the driveshaft and rotate it 180 degrees. Reconnect the
driveshaft. Recheck the runout at the rear of the driveshaft.
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If the runout is still over specification, mark the high point and proceed to Step 3.
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If the runout is within specification, check for the
vibration at the road test speed. If the vibration is still present,
balance the driveshaft. Refer to Driveshaft Balancing in this procedure.
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NOTE:
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Excessive driveshaft runout can originate in
the driveshaft itself or from the pinion stem. To find the source,
compare the 2 high points previously determined.
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If the index marks are close together, within 25 mm
(1 in), the driveshaft is eccentric. Install a new driveshaft.
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If the marks are on opposite sides of the
driveshaft, 180 degrees apart, the pinion stem is responsible. Check the
pinion stem runout. If the pinion stem runout exceeds specifications, a
bent pinion is indicated.
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If the pinion runouts are within specifications,
road test and check for the vibration at the road test speed. If the
vibration persists, balance the driveshaft. Refer to Driveshaft
Balancing in this procedure.
Driveshaft Balancing – Using the Mastertech® Series MTS 4000 Driveline Balance and NVH Analyzer (Vetronix)
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Special Tool(s): Mastertech® Series MTS 4000
Driveline Balance and NVH Analyzer (Vetronix) 257-00018. Working under
the vehicle, install an accelerometer. The accelerometer can be attached
and mounted near either the transmission or differential end of the
driveshaft.
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NOTE:
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Clean an area of the driveshaft and
install the reflective tape, then install the photo-tachometer sensor.
The sensor should be placed at approximately a 20-degree angle from
perpendicular to the surface of the reflective tape. Make sure the
sensor does not get moved during the balance procedure.
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Reflective tape.
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Photo-tachometer sensor.
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Special Tool(s): Mastertech® Series MTS 4000
Driveline Balance and NVH Analyzer (Vetronix) 257-00018. Run a
driveshaft balance test with the driveshaft unmodified.
Use Special Service Tool: 100-002
(TOOL-4201-C)
Holding Fixture with Dial Indicator Gauge.
Vehicles without tapped pinion flanges
NOTE:
Aftermarket test weights and clamps are suitable for use during this procedure.
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NOTE:
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Special Tool(s): Mastertech® Series MTS
4000 Driveline Balance and NVH Analyzer (Vetronix) 257-00018. Run a
second test with a test weight. Using a metal band, secure the test
weight to the end of the driveshaft. The weight should be placed at the
end of the driveshaft tube, as close to the tube-to-yoke weld seam as
possible. Mark the location of the test weight on the driveshaft, as
shown in the figure below.
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Test weight.
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Tube-to-yoke weld seam.
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Driveshaft pinion stem and CV-joint inner race.
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Select the test weight based on driveshaft size.
Larger driveshafts use 10 g (0.353 oz). Smaller driveshafts use 5 g
(0.176 oz).
![](images/general_procedures_driveshaft_runout_and_balancing-2437/2324/imagen2_007(27).jpg) |
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NOTE:
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Remove the test weight, then install the
recommended weight at the position directed by the Mastertech® Series
MTS 4000 Driveline Balance and NVH Analyzer (Vetronix). Using a metal
band and epoxy, secure the test weight to the driveshaft, as shown in
the figure below.
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Test weight.
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Measure in this direction.
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Driveshaft diameter.
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Directional rotation.
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Balance weight relative to test weight centerline.
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The results are displayed with respect to the location to where the test weight was placed.
All vehicles
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Special Tool(s): Mastertech® Series MTS 4000
Driveline Balance and NVH Analyzer (Vetronix) 257-00018. Run a third
test to verify the repair.
Driveshaft Balancing – Hose Clamp Method
NOTE:
Aftermarket test weights and clamps are suitable for use during this procedure.
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Install 1 or 2 hose clamps on the driveshaft, near
the rear. Position of the hose clamp head(s) can be determined through
trial and error.
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Mark the rear of the driveshaft into 4 approximately
equal sectors and number the marks 1 through 4. Install a hose clamp on
the driveshaft with its head at position No. 1, as shown in the figure
below. Check for vibration at road speed. Recheck with the clamp at each
of the other positions to find the position that shows minimum
vibration. If 2 adjacent positions show equal improvement, position the
clamp head between them.
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If the vibration persists, add a second clamp at the same position and recheck for vibration.
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If no improvement is noted, rotate the clamps in
opposite directions, equal distances from the best position determined
in Step 14. Separate the clamp heads about 13 mm (1/2 in) and recheck
for vibration at the road speed.
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NOTE:
Make sure the clamps are tight in the final position where the vibration is reduced.
Repeat the process with increasing separation until
the best combination is found or the vibration is reduced to an
acceptable level. The hose clamps will remain secured to the driveshaft
after completion of this balancing procedure.
Check
NOTE:
Prior to checking driveline angularity, inspect the U-joints for correct operation.
NOTE:
An incorrect driveline angle can cause a vibration or shudder...
Removal
NOTE:
The maximum articulation of the flex coupling is 4 degrees.
The maximum articulation of any U-joint is 25 degrees. The maximum
articulation of the center CV-joint is 20 degrees...
Other information:
WARNING: It is extremely dangerous
to ride in a cargo area, inside or outside of
a vehicle. In a crash, people riding in these
areas are more likely to be seriously
injured or killed. Do not allow people to
ride in any area of your vehicle that is not
equipped with seats and seatbelts...
Special Tool(s) /
General Equipment
Interior Trim Remover
Removal
Remove the passenger door window control switch bezel assembly.
Release the locking tabs from the passenger door window control switch bezel assembly.
Use the General Equipment: Interior Trim Remover
Disconnect the passenger door window control switch the electrical connector...