TM 5-3825-226-24 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 Ill 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. A10234X1 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