General Information
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knurled end of the gauge to carefully
expand the gauge fingers to the limit
within the bore. Do not over tighten the
gauge because there is no built-in
release. Excessive tightening can
damage the bore surface and damage
the tool. Remove the gauge and
measure the outside dimension (Figure
30). Small bore gauges are typically
used to measure valve guides.
Dial Indicator
A dial indicator (Figure 31) is a gauge
with a dial face and needle used to
measure variations in dimensions and
movements. Measuring brake rotor run
out is a typical use for a dial indicator.
Dial indicators are available in various
ranges and graduations and with three
basic types of mounting bases:
magnetic (B. Figure 31). Clamp, or
screw-in stud. When purchasing a dial
indicator, select one with a continuous
dial (A, Figure 31). Cylinder Bore
Gauge.
A cylinder bore gauge is similar to a dial
indicator. The gauge set shown in
Figure 32 consists of a dial indicator,
handle, and different length adapters
(anvils) to fit the gauge to various bore
sizes. The bore gauge is used to
measure bore size, taper and out-of-
round. When using a bore gauge, follow
the manufacturer’s instructions.
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