Face alignment is determined by calculating the total indicator reading (TIR}.
Attach the dial indicator gauge, Part Number 3376050, to the crankshaft. Use mounting tool, Part Number ST1325,
to attach the dial indicator to the crankshaft as illustrated.
NOTE: The dial indicator can be mounted by any method that holds the extension bar of the indicator rigid, so it
does not sag. If the bar sags or the indicator slips, the readings obtained will not be accurate.
Position the indicator at the 12-o’clock position, and zero the gauge.
NOTE: The crankshaft must be pushed toward the front of the engine to remove the crankshaft end clearance
each time a position is measured.
Use the barring tool, Part Number 3824591, to slowly rotate the crankshaft.
Record the readings at the 3-o’clock (A), 6-o’clock (B) , and 9-o’clock positions (C).
The values for A, B, and C can be positive or negative.
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 and the
procedure will have to be repeated.
Determine the total indicator reading (TIR).
TIR is determined by calculating the difference between the highest and lowest measurement from the four
locations measured.
As the example below illustrates, the TIR is:
The maximum allowable total indicator reading (TIR) is determined by the diameter of the housing bore. If out of
specifications, replace the housing.
NOTE: For rear gear train engines, the rear gear housing can also be the cause of the TIR being out of specification.
