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 TM 55-1905-223-24-1
(2) Draw chalk marks on the flywheel housing at 12, 3, 6, and 9 o'clock
positions. Position indicator at 12 o'clock position and set dialto "0"
NOTE
If the alignment is not within specification, and the
housing is round, the housing can be shifted. If the
alignment is not within specification and the housing is
not round, the housing must be replaced.
(3) Rotate crankshaft one complete revolution (360 degrees). Record total
indicator run out (TIR). Determine if alignment is within the following
specification:
NOTE
Specification depends on the diameter of the housing bore.
Housing Bore
Diameter
Maximum TIR
31.00 to 31.91 inch
0.012 inch
(787.4 to 810.5 mm)
(0.30 mm)
25.50 to 25.51 inch
0.010 inch
(647.7 to 648.0 mm)
(0.25 mm)
CAUTION
The crankshaft end clearance must be pushed or pulled in
the same direction each time it is measured.
(4) Position the indicator at the 12 o'clock position. Adjust the dial to
"0" (FIG. 3-32a).
(5) Record readings at 3, 6 and 9 o'clock positions. Return to 12 o'clock
position, ensure dial points to "0" (FIG. 3-32b).
(6) Compute TIR as shown in the example below. Verify TIR is within
specification above. If not within specification, check for nicks,
burrs, or foreign material between the housing and block. If none exist
and the alignment is still out of specification, the block or housing is
not machined correctly.
Example
Inch
mm
12 o'clock
0.00
0.00
3 o'clock
+0.003
+0.08
6 o'clock
-0.002
-0.05
9 o'clock
+0.003
+0.08
Equal TIR
0.005
0.13
3-95
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