Rotax 912 Series Maintenance Manual page 53

2.2) Checking of the overload clutch
At suspicion of slipping or blocking, verification of the slipping torque (overload
clutch) must be carried out.
NOTE:
- Lock the crankshaft. Refer to chapter 12-00-00, para 2.7.
- Remove the propeller as per instructions of the manufacturer.
- Fit a specially designed lever to the propeller flange (e.g. length 1,5 m / 5 ft.,
see fig. 3) and determine slipping torque with use of a spring scale. Applica-
ble is the value determined during a slow turning motion. Repeat the
measurement several times to get a stable value.
The slipping moment is calculated from the spring force (F) measured in N
and the length of the lever arm (L) applied in m (N x m = Nm).
- Remove the crankshaft locking screw. Refer to chapter 12-00-00, para 2.7.
Slipping of the clutch must occur between 600 and 800 Nm (440 and 590 ft.lb.).
WARNING: Do not exceed 800 Nm (590 ft.lb.) otherwise internal damage
If the torque is below or above this value, inspect, repair or overhaul the propeller
gearbox in accordance with the ROTAX
ness.
- Detailed inspection of all gearbox components.
00621
Effectivity: 912 Series
AIRCRAFT ENGINES
MAINTENANCE MANUAL
Slipping of overload clutch is apparent if at engine speed rise,
the propeller speed does not increase at the same rate.
can occur.
instructions for continued airworthi-
®
Länge L (m) /
length L in m
05-50-00
Kraft F in N /
force F in N
fig. 3
page 3
Rev. 1, Jan. 01/2002