21
Crank Sensor (Hall Effect) and Mounts
Systems controlling fuel only (many Rotax and Jabiru engines) use an adjustable, single element Hall
Effect sensor and 2 or 3 magnets mounted to the crankshaft to send rpm information to the ECU.
Magnets should pass over the center of the small black squares at the end of the sensors. On Dual
ECU systems, the crank sensor cables are color coded green for primary and red for backup.
Checked that these are installed correctly.
D type (fuel only), F type adjustable blade, Lycoming F type single and dual Hall sensors
Rotax 912 engines use a machined magnet disc, which bolts to the rear of the crankshaft (slides
over dynamo 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 torquing procedures for the rear
crankshaft nut.
Hall sensor mounts. Left to right: Lycoming 3.25 spacing., Lycoming 3.50 spacing., Rotax and Jabiru
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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