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582 Generator bench tests?

  • Nick Clark
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4 years 1 month ago - 4 years 1 month ago #4528 by 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.

Thanks
Nick
Last Edit: 4 years 1 month ago by Nick Clark. Reason: spelling correction

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4 years 1 month ago #4533 by bill martin
Nick,

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.

Bill.

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4 years 4 weeks ago #4546 by Nick Clark
Thank you a lot of useful information on there useful but.....

There doesn't seem, at least I didn't fine, to be any specific test for the rpm pick up, this is the bit that may not work.

Can anyone suggest a static bench test for this ?

Cheers
Nick

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4 years 4 weeks ago #4547 by Nick Axworthy
Have you asked Conrad about it Nick....not much he doesn't know.

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4 years 4 weeks ago #4548 by Nick Axworthy
Reading through some of those tech articals...it says that the tach reads the pulses and that moving the earth can cure a tach prob,

www.800-airwolf.com/pdffiles/ARTICLES/Pa...9%20-%204%20page.pdf

Has your a/c got an electric starter ????

Nick.

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4 years 4 weeks ago #4549 by Nick Clark
Aircraft - Shadow (microlight/ultralight) has a pull start unfortunately.

I have remade and added to earths but to no effect.

Cheers
Nick

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4 years 4 weeks ago #4550 by bill martin
Nick,

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.

Bill.

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4 years 4 weeks ago #4551 by bill martin
Nick,

Another quick fix is just forget the grey wire and install a Tiny Tach.

Bill.

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4 years 4 weeks ago #4552 by Nick Axworthy
Nick has it ever worked 100% satisfactory for you.

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4 years 4 weeks ago #4554 by bill martin
Nick (Axworthy),

Have you found anything that cures this problem? I have never been able to come up with a sure fire answer. It just seems that some engines have the problem and some never do.

Bill.

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4 years 4 weeks ago #4555 by Nick Clark
Hi All

The standard ROTAX did work .....then didn't

Tried a Tiny Tach , at least a ebay clone but although it worked lashed up (taped on the side) , on the shadow (Tandem -pusher) I had to lengthen the wire and that seemed to stop it working.

It is all rather a pain.

Thanks for all the help
Cheers
Nick

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4 years 4 weeks ago #4559 by Nick Axworthy
Nick with you having no starter battery...I wonder if that could have any effect on the geni...as they need a load to work,

But as I think the tach run from the ignition it prob has no bearing on it...just a thought though,

I think you can get the correct extension wire for those Tiny Tachs if your dont work with your extension....I dont know if there is anything special about then extension though,

You didn't say Nick...have you spoken to Conrad at Conair about it....very helpful guy.

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