Yanmar 1GM User Manual page 21

14
CHAPTER ONE
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Vern ier Caliper
This tool is used to obtain inside, outside and depth
measurements. Sec Figure 31.
O uts ide Micrometers
One of the most accurate tools used for precision mea-
surement is the outside micrometer. Outside micrometers
are required to measure shim and bearing thickness and
piston diameter. Outside micrometers are also used wit h a
telescoping gauge to measure cylinder bore. Micrometers
can be purchased individually or as a set (F igu re 32),
Oial Indicator
Dial indicators (Figu re 33) are used to check cran kshaft
and drive shaft runout limits. Select a dial indicator with a
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continuous dial (Fig ure 34).
Cyl inder Bore Ga uge
The cylinder bore gauge is a very specialized precision
toot. The gauge set shown in Figure 35 is comprised ofa
dial ind icator, handle and various length adapters to adapt
the gauge to different bore sizes. The bore gauge can be
used to make cylinder bore measurements such as bo re
size, taper and out-of-round. An outside micrometer must
bc used to calibrate the bore gauge.
Telescoping Ga uges
Telescoping gauges (Figure 36) can be used to measure
hole diameters from approximately 8 mm (5116 in.) to 150
mm (6 in.). The telescoping gauge docs not have a scale
gauge for direct readings. An outside micrometer is re-
quired to determine bore dimensions.
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