12
Bracket Bolts and place another washer under the Hall Bracket Bolts. You could also do a depth
measurement from hex bolt surface down to the case bolt inside, and check against protrusion of bolt
through gold bracket. Snug tighten for now torque can be done after clearance checking.
Clearance checking Hall Sensor Air Gap to Magnets and Flywheel inner surface
For Either the Single or Dual Hall sensors you
need to have an air gap from the Hall Sensor
edges to the pulley inner surface of about
.025” to .040” See photo below. Use shim
washers under the Gold Hall sensor bracket if
you need to get the Hall sensor closer to the
pulley to achieve proper gap. See photo.
The wider Dual sensor vs Single Hall sensor
ends up with a larger magnet to sensor air
gap but this is okay since the magnets can still
trigger the sensor as far away as .250” Single Hall with edge gap of .025”
should end up with magnet-sensor gap of about .060”. Dual Hall with edge
gap of .025” should end up with magnet-sensor gap of about .090”.
Once correct gap is established, all bolts can be torqued to specs.
Torque Specs:
Case bolt/nut: 300 in-lbs.
Hall Bracket Bolts: 215 in-lbs.
Hall Sensor 10-32 Allen bolts: 25 in-lbs with blue Loctite on the threads, 30 in-lbs dry.
Hall Sensor mounting Rotax 912 engines This setup uses the “D” type or “F” type hall sensor and a
machined magnet disc, which bolts to the rear of the crankshaft (slides over dynamo ring stub) and a
machined Hall sensor mount which bolts to the upper left side of the engine. Magnets are already
installed for you. Follow factory recommended torque procedures for the rear crankshaft nut.
Rotax hall sensor mount Rotax magnet disc
Hall Sensor mounting Jabiru 2200 and 3300 engines use a split magnet collar, which bolts over the
crankshaft as shown below. The supplied Hall sensor mount bolts to the right front of the crankshaft seal
plate as shown below.
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