14
CHAPTER
ONE
\ ,", '
Vern
ier
Ca
liper
This tool is used to obtain inside, outside and depth
measurements. Sec Fi
gure
31.
Outside
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 with a
telescoping gauge to measure cylinder bore. Micrometers
can be purchased individually or as a set (Figure 32),
Oial
Indica
tor
Dial indicators
(Figu
re 33) are used to check crankshaft
and drive shaft runout limits. Select a dial indicator with a
@
continuous dial (Fig
ure
34).
Cyli
nder
Bore Ga uge
The cylinder bore gauge is a very specialized precision
toot. The gauge set shown in Figure 35
is comprised o
fa
dial indicator, 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 bore
size, taper and out-of-round. An outside micrometer must
bc used to calibrate the bore gauge.
Telescoping Ga uges
Telescoping gauges (Fig
ure
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.
I,'11'
'"
II
10
1/",
""
,
,
2
0~
30
z:
-
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