Checking Of The Overload Clutch - Rotax 912 Series Maintenance Manual

2) Checking of the overload clutch

General note In the event of lead deposits and/or if slipping is suspected, it will be nec-
essary to check the overload clutch.
NOTES:
NOTES:
1
2
3
Fig. 1
Effectivity: 912 Series
Edition 3 / Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
Slipping of overload clutch is apparent if at engine speed
rise, the propeller speed does not increase at the same
rate.
The engine should be run for a short time just prior to the
test, otherwise there is the risk of the clutch „drying out",
resulting in a higher torque.
Step
Remove the propeller as per manufacturers instruction.
Lock the crankshaft. See chap. 12-20-00 section:
NOTICE
A specially prepared lever (e.g. length 1.5 m (4.92 ft.), see Fig.1) is fitted on
the propeller flange and the breakaway torque measured with a suitable
measuring tool.
NOTE:
Länge L (m)/
length L in m
Kraft F in N/
force F in N
Procedure
Danger of damage to the engine suspension!
Depending on the engine installation (e.g. in the case
of extremely lightweight engine suspension), the
gearbox must be removed and the test carried out on
a suitable mounting attachment.
Because of difficult measurement of the slipping torque
the breakaway torque is measured.
7)
08054
05-50-00
page 5
September 01/2012