TM 5-3805-260-24
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 crankshaft up
against the top bearing. Write the measurement
for bearing clearance on Iine 1 in column (C).
2.
Divide the measurement from Step I by 2. Write
this number on line I in columns (B) & (D)
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.
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.
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