Rotax 912-UL - 1) Checking of the Slipping Torque; 2) Dis-Assembly of Gearbox

6.ls.1)
6.r5.2)
Checking
of
the slipping
torque
Clamp
gear
cover ass'y with
fitted
prop
shaft
and overload
clutch
to
a suitable
support.
Measure
slipping
torque
using a specific
lever
(e.g.
1,5
m long)
and
spring
scale.
Determine
mean
value
by
pulling
through
several times
slowly.
The
slipping
torque is
calculated
in
Nm
(in.lb.)from
force
in
N
0b.)
x length
of leverin
m
(in.)
=
N
0b.)
x m
(in.)
=
Nm
(in.lb.).
Alternativtjly
check
slipping
torque with reduction gear
fitted,
engine
on
tresrle
or
installed
in
aircraft.
Crankshaft locked
by assigned
screw,
and
torque measured
as
above
with lever
and spring
scale.
Adjust
the slipping
torque
to
450
Nm t30 Nm
(4000
in.lb
?60 in.lb.)by
turning
the
collar nut,
thus
setting
the
pre-load
of
the
spring in
the
overload
clutch.
Disassembly
of
gearbox
Place gearbox
under
suitable fixture
O and
put pressure
viayoke
O on
dog
gearuntil
ring
halves
0 come free
and
can be
taken off. Now
release
pressure
from
gear
by
turning
spindle
back
()
and
remove gearbox
from
fixture.
Remove
retaining
ring
6
(on
engine version
with
vacuum
pump,
retaining
ring
is
executed
as drive
gear),
thrust
washer
and
dog
gear
ass'y. Force
apart
bush
@ by
circlip
pliers
and
withdraw
from
shaft.
I ATTENTION:
Don't
overstress
bearing
bush
@,
otherwise it
will
become
unus-
able.