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99
TM 9-2320-312-24-2
Testing and Adjusting Section
7. Turn the flywheel counterclockwise in order to
1. Fasten a dial indicator to the flywheel so the anvil
put the dial indicator at position (D). Write the
of the dial indicator will contact the bore of the
measurement in the chart.
flywheel housing.
8. Add the lines together in each column.
9. Subtract the smaller number from the larger
number in column B and column D. Place this
number on line III. The result is the horizontal
eccentricity (out of round). Line III in column C is
the vertical eccentricity.
g00285932
Illustration 85
Checking bore runout of the flywheel housing
g00286046
Illustration 87
Graph for total eccentricity
g00285936
(1)
Total vertical eccentricity
Illustration 86
(2)
Total horizontal eccentricity
(3)
Acceptable value
2. While the dial indicator is in the position at
(4)
Unacceptable value
location (C) adjust the dial indicator to 0.0 mm
(0.00 inch). Push the crankshaft upward against
10. Find the intersection of the eccentricity lines
the top of the bearing. Refer to Illustration 86.
(vertical and horizontal) in Illustration 87.
Write the measurement for bearing clearance on
line 1 in column (C).
11. If the point of the intersection is in the
ACCEPTABLE range, the bore is in alignment.
Note: Write the measurements for the dial indicator
If the point of intersection is in the NOT
with the correct notations. This notation is necessary
ACCEPTABLE range, the flywheel housing must
for making the calculations in the chart correctly.
be changed.
3. Divide the measurement from Step 2 by two.
Write this number on line 1 in columns (B) and
(D).
4. Turn the flywheel in order to put the dial indicator
at position (A). Adjust the dial indicator to 0.0 mm
(0.00 inch).
5. Turn the flywheel counterclockwise in order to
put the dial indicator at position (B). Write the
measurements in the chart.
6. Turn the flywheel counterclockwise in order to
put the dial indicator at position (C). Write the
measurement in the chart.

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