Illustration 85 Checking bore runout of the flywheel housing

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.

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Illustration 85

Checking bore runout of the flywheel housing

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Illustration 87

Graph for total eccentricity

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(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.