Arctic Cat Cougar Service Manual page 30

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vernier caliper are measuring the length of
springs, the thickness of shims and thrust wash-
ers or the height of the reed valve stops.
Outside Micrometers
One of the most reliable tools used for preci-
sion measurement is the outside micrometer.
Outside micrometers will be required to measure
piston diameter. Outside micrometers are also
used with other tools to measure cylinder bore.
Micrometers can be purchased individually or as
a set (Figure 41).
Dial Indicator
Dial indicators (Figure 42) are precision tools
used to check differences in machined surfaces,
such as the runout of a crankshaft or brake disc.
A dial indicator may also be used to locate the
piston at a specific position when checking igni-
tion timing. For snowmobile repair, select a dial
indicator with a continuous dial (Figure 43).
Several different mounting types are available,
including a magnetic stand that attaches to iron
surfaces, a clamp that can be attached to various
components, and a spark plug adapter that lo-
cates the probe of the dial indicator through the
spark plug hole of the cylinder head. See Mag-
netic Stand in this chapter. The various mounts
are required for specific measuring require-
ments. The text will indicate the type of mount-
mg necessary.
Degree Wheel
A degree wheel (Figure 44) is a specific tool
used to measure parts of a circle and angles. For
Arctic Cat snowmobiles, a degree wheel can be
used to help locate and mark the crankshaft
position. A degree wheel can be ordered through
most parts suppliers.
CHAPTER ONE
Cylinder Bore Gauge
The cylinder bore gauge is a very specialized
precision tool. The gauge set shown in Figure 45
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