15) Magneto Hub; 16) Interference Suppression Box; 1) Disassembly Of Interference Suppression Box - Rotax 912 Series Maintenance Manual

13.4.15) Magneto hub

13.4.16) Interference suppression box

Effectivity: 912 Series
AIRCRAFT ENGINES
MAINTENANCE MANUAL II
See fig. 106 and 107.
Visually check magneto inner side r and the taper surface t. Under
normal circumstances dismantling of magneto hub is not necessary.
If it had been dismantled, clean the contact surfaces y. Apply LOCTITE
221 to all 10 Allen screws u (alternating 5 screws M6x30 and 5 screws
M6x25) and torque to 10 Nm (90 in.lb.).
NOTE: The hole pattern in the magneto ring is symmetrical and
therefore it can be assembled in any position with the
flywheel hub.
Check Woodruff key in crankshaft for tight fit and degrease tapers of
crankshaft and magneto hub. Apply LOCTITE
well spread into the taper of magneto hub.
Fit magneto hub, washer 17x36x5, spring washer. Apply LOCTITE
221 to hex. screw M16x1,5, fit and immediate tighten to 60 Nm (531
in.lb.) +180° angle to rotation.
CAUTION: The Woodruff key serves for positioning and must re-
main in the groove.
Check the gap U between trigger coil and trigger cam with a feeler gage.
The axial position of the trigger coil to the trigger cam (part of the flywheel
hub) must be in the middle and offsetting must not exceed I, see para 15.
See fig. 107/1.

13.4.16.1) Disassembly of interference suppression box:

The 2 electronic boxes, 4 double ignition coils and 2 feed-
through capacitors are placed in the interference suppression
box. On every suppression box you will find a successive
serial number on its cover. Always state this number on
inquiries..
To prevent any mix-up at a later stage, mark all 8 H.V. (high
voltage) leads according to code on cover, prior to withdrawal.
Remove 3 countersunk screws M4x8 and upper half of high
voltage clip plate. Now, single H.V. leads can be exchanged as
required. H.V. leads are available pre-assembled with connec-
tion to spark plug.
Mark all connections to ignition coils and then detach wiring.
Remove 4 countersunk screws M4x12 from underside of
electronic box and detach mass connection. The complete set
of ignition coils can be withdrawn now. If need be, remove
electronic boxes as well, after disconnecting shorting lines
from capacitors. Check capacitors, renew as required. Check
all other components.
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221 sparingly, however
page 74
Initial issue, Jan. 01/2002
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