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Jabiru magnet collar Jabiru Hall Sensor mount
Set magnet air gap from the sensor to .050 - .080 inches by shimming the sensor or moving the collar as
the case may be. Torque Hall Sensor 10-32 Allen bolts to 25 in-lbs with blue Loctite on the threads, 30
in-lbs dry.
Indexing of the magnet discs is not important on fuel-only systems. The ECU just needs a frequency. 4
cylinder engines will use 2 magnets 180 degrees apart, 6 cylinder engines have 3 magnets 120 degrees
apart. These are called the trigger magnets.
Important, if your engine has fuel and spark control, your magnet disc will have an extra magnet
mounted, inverted polarity from the rest. This is the synch magnet and identifies #1 cylinder to the ECU
for spark control purposes. You’ll also have a twin element Hall sensor instead of the single element one.
If you have spark control, you need to index the magnet disc so that, with the crank at TDC#1, the #1
trigger magnet (one of the equally spaced ones with the synch magnet closest to it) is around 80 degrees
past the black squares on the Hall sensor, in the direction of crank rotation. See the diagrams in the F
Supplemental Manual.
Lycoming Ignition Coilpack(s) Mounting
Most aviation systems will come with either 1 or 2 coilpacks. Dual ECU systems almost always have 2
coilpacks. Single ECU systems may
have just 1 coilpack and use a
conventional magneto as the 2
nd
ignition. The 4cyl ones have integral
drive transistors, the 6cyl ones use
an external drive module bolted to
the coil mount with wiring
connections in between. Both types
may be engine mounted in any
orientation. We offer several
mounting brackets for Lycoming
applications and flat type bases for
firewall mounting.
4 cylinder and 6 cylinder coilpacks with rear mag mounts
Lycoming, Important! If you’re replacing the left magneto, be sure to remove the drive gear,
coupler and bearing on some models from the case before installing the SDS mag covers or coil
mounts. Use a thin layer of RTV on the mag covers before tightening the nuts. 6 cylinder engines
require removal of the bearings, gears and cush drives. See separate exploded view document.
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