4 years 4 months ago - 4 years 4 months ago#4528by Nick Clark
Does anyone know what are or where I can find bench test information on the Rotax 582 generator. I mean coil resistance and whether there is any way to check the rpm pick up - grey wire.
The generator appears to work as far as ignition/chanrging but the rpm pick appears to have a fault....I know there is lots of talk about how unreliable this is and to just live with it but we have two students in the group and the instructor would like it to work. Curently it shows a large mag drop (not real) and under-read on max rpm - indicated 5800 actual 6500rpm. And all other wiring and the rpm instument itself have been checked and found to work.
Last Edit: 4 years 4 months ago by Nick Clark. Reason: spelling correction
Best place for specs for bench testing are on the California Power Systems 1-800 Airwolf website. Go to the TECH INFO tab at the top of the page and click on TECH ARTICLES. Article #58, troubleshooting the ducati ignition.
Resistance values for the tach (grey) wire are 30-35 ohms for the old style and 35-40 ohms for the new style generator. There is an old service bulletin that warn of wire breakage in the older generators. In them, the grey wire is soldered to a resistor which is mounted on the stator and vibration causes a break at this resistor. Fix is to move this resistor outside the engine away from the stator.
Mag drop readings on the 582s are notoriously unreliable. The tach is reading six pulses per revolution normally, but when you switch half the system to ground during a mag check, the tach sometimes goes nuts on some engines. I have buddies who just ignore the tach and listen to the engine during mag checks.