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912 Ignition module failures

  • Daniel Leach
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3 years 11 months ago - 3 years 11 months ago #8728 by Daniel Leach
912 Ignition module failures was created by Daniel Leach
Hi all

I just thought would conduct a survey

Please post on this thread if you have had to replace any of your rotax 912 ignition modules

I will start four of my friends had had at out local airfield have replaced and I have one replace on my motor .
912uls are all around the years of 2006 to 2007 with 150 to 600 hours on them that had problems .


Watch this space :). We may run out of paper :)
Last edit: 3 years 11 months ago by Daniel Leach.

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3 years 11 months ago #8737 by G-CDFO
Replied by G-CDFO on topic 912 Ignition module failures
Both modules 912 ULS; 2006 plane at 650 hours. Gradual deterioration in performance (from around 500 hrs). Apparently one fails, then the other giving the impression they both go at the same time, in both cases its gradual, sometimes it will, sometimes it wont start. The later becoming more frequent until it just won't.

Aware of two other 912ULS planes experiencing similar symptoms.
Around £1200 UK for 2 units (around $1500 USD) in the UK.

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3 years 11 months ago #8740 by Daniel Leach
Replied by Daniel Leach on topic 912 Ignition module failures
Yes Colin that is one of the problems we have found too the caps break down inside a friend has worked out a way to check caps out put value using a meter with them still on th plane .. The caps they use only have 80c deg temp rating they could have spent another dollar of two for a 100 deg cap when manufacturing them .

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3 years 11 months ago #8790 by hpb
Replied by hpb on topic 912 Ignition module failures
I am told to expect 30 days for replacement modules. Add to that the time it took to identify the likely problem, send them for a bench test, and you are grounded for several weeks.

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3 years 11 months ago #8795 by alananpat
Replied by alananpat on topic 912 Ignition module failures
Yes, I have replaced both modules on my 2006 engine at around 400 hours. It was just like Colin described.

Alan

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3 years 11 months ago - 3 years 11 months ago #8951 by Daniel Leach
Replied by Daniel Leach on topic 912 Ignition module failures
This is what inside a 912uls 6 pin module ,this one the two fet chips have been removed where the 2 holes are before this photo was taken . On this unit a fet had blown making unit total dead ,but the normal problem is the orange thing which is the main out put discharge capacitor gets weak so then hard starting follows .

cheers daniel

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Last edit: 3 years 11 months ago by Daniel Leach.

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3 years 11 months ago #8972 by quimeras
Replied by quimeras on topic 912 Ignition module failures
I know of 9 rotax owners that have had to change the ignition modules. I changed mines two years ago. Because of the pricy modules many other people is using the heating gun trick to start their engines. www.rotax-owner.com/rotax-forum/3-4-stro...ules-and-heating-gun

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3 years 11 months ago - 3 years 11 months ago #8999 by Daniel Leach
Replied by Daniel Leach on topic 912 Ignition module failures
You can test capacitor by using the one blue wire the (two blue wires are both linked together inside) and use a black wire ,the capacitor test in a new module unit tests around 2 micro farad . I hard staring one seem to deteriorate down to 1.5 micro farad or below a cross those two back and blue wires . You have to use a capacitor tested to do this . One think is for sure it will fail with time and use in the end sorry to say .

Cheers
Last edit: 3 years 11 months ago by Daniel Leach.

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3 years 11 months ago #9001 by markkkk
Replied by markkkk on topic 912 Ignition module failures
Does anyone out there have ignition modules that are 2010 or later that have died?. These units should have the soft start built into them. I would like to get hold of one if possible I will pay the postage and even a small remuneration to be able to get hold of one or two but they need to be the soft start ones. Maybe out of a crashed aircraft as they would not be used again or possibly even a engine fire. It does not matter if the module is damaged so long as it is intact

Mark

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