TM 5-3805-260-24
FLYWHEEL HOUSING BORE
NOTE: Write the dial indicator measurements with their positive (+)
and negative (-) notation (signs). This notation is necessary for
making the calculations in the chart correctly.
1.With the dial indicator in position at (C), adjust the dial indicator
to "0" (zero) Push the crankshaft. up against the top bearing
Write the measurement for bearing clearance on line 1 in column (C).
2.Divide the measurement from Step 1 by 2 Write this number on
line 1 In columns (B) & (D).
3.Turn the crankshaft. to put the dial Indicator at (A) Adjust the dial
indicator to "0" (zero).
4.Turn the crankshaft. counterclockwise to put the dial indicator at
(B). Write the measurement in the chart.
5.Turn the crankshaft. counterclockwise to put the dial indicator at
(C). Write the measurement in the chart.
6.Turn the crankshaft. counterclockwise to put the dial indicator at
(D). Write the measurement in the chart.
7.Add lines I & II by columns.
8.subtract the smaller number from the larger number in line III in
columns (B) & (D) The result is the horizontal "eccentricity" (out
of round) Line III, column (C) is the vertical eccentricity.
CHART FOR DIAL INDICATOR MEASUREMENTS
Position of
dial indicator
Line
No.
A
B
C
D
Correction for bearing clearance
I
0
Dial Indicator Reading
II
0
Total of Line 1 & 2
III
0
**
*
**
*Total Vertical eccentricity (out of round).
**Subtract the smaller No. from the larger No. The difference is
the total horizontal eccentricity
9.
On the graph for total eccentricity find the point of Intersection of
the lines for vertical eccentricity and horizontal eccentricity
10.
If the point of intersection is in the range marked "Acceptable"
the bore is in alignment If the point of intersection is in the
range marked "Not Acceptable" the flywheel housing must be
changed
1-31
