1) Checking Of The Slipping Torque; 2) Dis-Assembly Of Gearbox - Rotax 912-UL Repair Manual

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.