Drive Of Vacuum Pump; Ignition Unit - Rotax 912-UL Repair Manual

6.L7) Drive of vacuuin pump
On engines equipped with vacuum pump, check corresponding ball- and needle bearings, drive
gearand oil seal, andrenew as necessary. SecureAllen screw M6x14 withLOCTITEZ2I.On
no account change length of screw.
O NOTE:
Don't pull vacuum pump apart. If need be, exchange the complete unit.
6.18) Ignition unit:
) *
The engine is equipped with a dual ignition unit of a breakerless, capacitor discharge design,
with an intergrated 250 W generator. The unit consists of the generator stator in the ignition
cover, the magneto ring on the crankshaft, 4 external trigger coils for ignition, 1 external trigger
coil for rev-counter and the ignition coils and electronic box in an interference suppression box
attached on the aircraft.
Two independent charging coils located on the gendrator stator supply one ignition circuit
each. The energy is stored in capacitors. At the moment of ignition the two each external trigger
coils actuate the discharge of the capacitor to the primary circuit of the dual ignition coils. The
operation of the ignition unit is
completely free of maintenance.
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6.18.1) Generator stator
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8 lighting coils O and 2 charging coils @ arefitred
to the statorring. Repair work on coils is not planned. At arenewal
of the stator ass'y, take care of properrouting and clamping of cable
strands.
Thecablejoints @ aretobe securedwith SIKAFLEXadhesiveputty topreventcable-
breakage due to vibration.
Attach generator stator to ignition cover using 4 screws M5x25 tightened to 7 Nm (60 in.lb.).
Fit the charging cable clamps @ back to back to support-patch @ using Allen screws M5k20
secured by lockwasher. The two cable lugs G) crimped to screening metal braid to be anached
to the engine by one ignition cover screw O. Cables @ to be routed in a way of no possible
interference with the flywheel. Tighten Allen screw M5 to 6 Nm (55 in.lb.).
ROTAX.
Rmi"912-UL