TM 10-3950-672-24-2
Continue to rotate the crankshaft until the indicator is at
the 12 o'clock position. Check the indicator to make
sure the needle points to zero. If it does not, the
readings will be incorrect.
Caution: Do not force the crankshaft
beyond the point where the bearing
clearance has been removed. Do not
use the flywheel housing as a
fulcrum.
Determine the adjustment for main bearing clearance by
raising the rear of the crankshaft to its upper limit. Use
a floor mounted support with a padded pry bar to raise
the crankshaft.
Record the indicator reading.
Calculate the bearing clearance adjustment by
subtracting one-half of the reading obtained in the
previous step from the reading obtained at the 6 o'clock
position.
Example:
Total bearing clearance -
+0.08mm [0.003 in]
One-half bearing clearance
+0.04mm [0.0016 in]
6 o'clock position reading =
+0.20mm [0.008 in]
+0.20mm [0.008 in]
+0.04mm [0.0016 in]
+0.16mm [0.0064 in] (Adjusted 6 o'clock reading)
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