Rotate the crankshaft until the dial indicator is at the twelve

o'clock position and zero the gauge.

Using a pry bar, raise the rear of the crankshaft to its upper

limit. Record the value as (d) in the concentricity work

sheet. This is the vertical bearing clearance adjustment

and will **always **be positive.

Using the concentricity work sheet, determine the values

for the "total vertical" and "total horizontal" values.

The total horizontal is equal to the nine-o'clock reading (a),

minus the three-o'clock reading (c).

The total vertical is equal to the twelve-o'clock reading (b),

plus the bearing clearance (d).

Example:

Six o'clock = ref = 0

Nine o'clock = (a) = 0.004

Twelve o'clock = (b) = 0.003

Three o'clock = (c) = -0.002

Using the work sheet and the numbers from the example,

the total horizontal value equals 0.006 and the total vertical

value equals 0.005.

Mark the total horizontal value on the horizontal side of the

chart and the total vertical on the vertical side of the chart.

Using a straightedge, find the intersection point of the total

horizontal and total vertical values. The intersection point

concentricity to be within specification.

Using the total horizontal and total vertical values from the

previous example, the intersection point falls within the

shaded area. Therefore, the flywheel housing concentricity

is within specification.