4. Disassembly and Reassembly
69
4.2.5 Measuring Instruments
No. Name of tool Use Illustration
1 Dial gauge Measures shaft bending, distortions
of levelness, and gaps.
2 Test indicator Measures narrow and deep places
which cannot be measured with dial
gauge.
3 Magnetic stand Keeps the dial gauge firmly in
position, thereby permitting it to be
used at various angles.
4 Micrometer Measures the outer diameter of the
crank shaft, piston, piston pin, etc.
5 Cylinder gauge Measure the inner diameter of the
cylinder liner and rod metal.
6 Vernier calipers Measures various outer diameters,
thicknesses, and widths.
7 Depth micrometer Measures sinking of valves.
8 Square Measures distortion in position of
springs and perpendicularity of
parts.
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