TM 5-3825-226-24
Bore Runout (radial eccentricity) of the Flywheel
Housing
1.
With the dial indicator in position at (C), adjust
the dial indicator to .000 in. 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 I in columns (B) & (D).
CHECKING BORE RUNOUT OF THE FLYWHEEL
HOUSING
3.
Turn the crankshaft to put the dial indicator at
(A). Adjust the dial indicator to .000 in.
4.
Turn the crankshaft counterclockwise to put the
dial
indicator
at
(B).
Write
down
the
measurement in the chart.
8S2328 DIAL INDICATOR GROUP INSTALLED
NOTE: Write the dial indicator measurements with their
positive (+) and negative (-) notation (signs). This is
necessary for making the calculations in the chart
correctly.
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 & 11 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 II, 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.
A10234X1
9.
On the graph for total eccentricity find the point
of
intersection
of
the
lines
for
vertical
eccentricity and horizontal eccentricity.
GRAPH FOR TOTAL 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.
2-74
