Feeler Gauge; Calipers - Hisun HS700UTV-4 Maintenance Handbook

Precision measurements can vary according to the experience of the person performing the
procedure. Accurate results are only possible if the mechanic possesses a feel for using the tool.
Heavy-handed use of measuring tools produces less accurate results. Hold the tool gently by the
fingertips to easily feel the point at which the tool contacts the object. This feel for the equipment
produces more accurate measurements and reduces the risk of damaging the tool or component.
Refer to the following sections for specific measuring tools.

Feeler Gauge

Use feeler or thickness gauges (Figure19) for
measuring the distance between two surfaces.
A feeler gauge set consists of an assortment of
steel strips of graduated thickness. Each blade is
marked with its thickness. Blades can be of various
lengths and angles for different procedures.
A common use for a feeler gauge is to measure
valve clearance. Use wire (round) type gauges to measure spark plug gap.

Calipers

Calipers (Figure 20) are excellent tools for
obtaining inside, outside and depth measurements.
Although not as precise as a micrometer, they allow
reasonable precision, typically to within 0.02mm or
0.05 mm (0.001 in.). Most calipers have a range up
to 150 mm (6 in.).
Calipers are available in dial, venire or digital
versions. Dial calipers have a dial readout that
provides convenient reading. Venire calipers have
marked scales that must be compared to determine the measurement. The digital caliper uses a
liquid-crystal display (LCD) to show the measurement.
Properly maintain the measuring surfaces of the caliper. There must not be any dirt or burrs
between the tool and the object being measured.
Never force the caliper to close around an object.
Close the caliper around the highest point so it can
be removed with a slight drag. Some calipers
require calibration.
manufacturer's instructions when using a new or
unfamiliar caliper.
To read a vernire. Calipers refer to Figure 21.
The fixed scale is marked in l-mm increments. Ten
individual lines on the fixed scale equal 1 cm. The movable scale is marked in 0.05 mm (hundredth)
GENERAL INFORMATION
Always refer to the
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