Stethoscope
(Figure 10.6)
This is a useful device
that can be used in a num-
ber of diagnostic situations. In its basic form it is
a long screwdriver! The probe (or screwdriver
blade) is placed near the suspected component
such as a bearing. The ear piece (or screwdriver
handle placed next to the ear) amplifies the
sound.
Take care though; even a good bearing
can sound rough using this method. Compare a
known good noise with the suspected one.
10.2.3 Test results
Some of the information you may have to get
from other sources such
as data books or a work-
shop manual is listed in the following table.
Test carried out
Information required
Backlash or freeplay
Backlash
data is often given, as the
distance component will move. The
backlash between two gears for
example should be very small
Overdrive operation
Which gears the overdrive is meant
to operate in!
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