Cessna T188C - Page 20

MODEL
188
& T188
SERIES
SERVICE
MANUAL
1-6.
BOLT
TORQUES.
The
importance
of
correct
d.
Add
friction
drag
torque
to
desired
torque
application
cannot
be
over
emphasized.
Under-torque
recommended
or
obtain
desired
torque
as
shown
in
can
result
in
unnecessary
wear
of nuts
and
bolts
as
figure
1-3.
This
is referred
to
as final
torque
well
as
parts
they
are
holding
together.
When
insuf-
which
should
register
on indicator
or
setting
for
a
ficient
pressures
are
applied,
uneven
loads
will
be
snapover
type
wrench.
transmitted
throughout
assembly,
which
may
result
e. Apply
a smooth
even
pull
when
applying
torque
in excessive
wear
or premature
failure
due
to fatigue.
pressure.
If chattering
or
a jerking
motion
occurs
Over-torque
can
be
equally
damaging
because
of
fail-
during
final
torque,
back
off
and re-torque.
ure
of
a bolt
or
nut from
overstressing
threaded
areas.
f.
When
installing
a
castle
nut,
start
alignment
There
are
a few
simple,
but
very
important,
proce-
with
cotter
pin
hole
at minimum
recommended
dures
that
should
be followed
to assure
that
correct
torque,
plus
friction
drag
torque,
and
do
not
exceed
torque
is applied:
maximum
plus
friction
drag.
If
hole
and
nut
castel-
a.
Calibrate
torque
wrench
periodically
to
assure
lation
do not
align
change
washers
or
nut
and
try
accuracy;
and
recheck
frequently.
again.
Exceeding
maximum
recommended
torque
is
b.
Be
sure
that
bolt
and
nut
threads
are
clean
and
not
recommended
unless
specifically
allowed
or
dry
unless
otherwise
specified.
recommended
for
that
particular
installation.
c.
Run
nut
down
to
near
contact
with
washer
or
bearing
surface
and
check
"friction
drag
torque"
required
to
turn nut.
1-5