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Greetings,

I'm all set to fly a new experimental, except that one ignition on the used engine I purchased is dead.   I did an ignition test a couple days ago, and it appears that I'm only running on one ignition.  From Both, when I select Left, there's no drop at all.  When I select Right, the engine quits just like I selected off.  I desperately wish this was just a wiring error on my ignition switch, but I double checked that today, and it's correct. 

I'm pretty new to 912s, but I've been reading the manual, and preparing for some troubleshooting.  First, the engine has 670 hrs on it, so the wiring isn't exactly new, but nothing appears broken that I can see.  

In the heavy maint manual, I see measurements for the ignition unit.  I have the 4 pin plugs, with the later white/yellow and blue/yellow wires, plus of course separate red for stator, and the two coil connections.  I will make these measurements this weekend, but other than a broken wire, I wouldn't expect a problem with pick up coils like this.  If one pickup was missing, would the whole ignition module shut down, or just one coil output?

It looks like this can't be a HV coil, since each one only fires two plugs, so there would have to be two out, so likely that's not the issue. 

Sadly, that brings me to my fear that an ignition module is bad.  Those things are just stupid expensive.  From the parts listing, it appears that my original part number would have been 965359, which is now replaced by 965446.  If I do have a bad module, can I just replace the one bad one, or do they both have to be replaced? 

Finally, does anyone test these modules in the US?  If I do end up suspecting one, I think I'd like to find out for sure that it's bad before spending $900+ on a new one. 

Thanks,

Rusty

  • Re: 912UL one ignition dead

    by » 5 months ago


    Lockwood Aviation can test the module and supply a new one if needed. They have great technical support. If you need a new module ask for dean Vogel he can advise on integrating it with the the old module. You can try cold soaking the suspected bad module with ice it may bring it back to life for a start up.  If that helps it then the module has a typical common failure, I believe it is an internal capacitor going bad.

    https://lockwood.aero


  • Re: 912UL one ignition dead

    by » 5 months ago


    That's good to hear.  I've purchased most of what I've needed for the 912 from Lockwood, and I have a link already saved to the new module.  If the testing this weekend doesn't show anything useful, I'll give them a call Monday. 

    Thanks,

    Rusty

     


  • Re: 912UL one ignition dead

    by » 5 months ago


    Hi

    If you have a keyed ignition which check if it is working properly 


  • Re: 912UL one ignition dead

    by » 5 months ago


    Thanks, but the key switch is fine.  I couldn't get that lucky.  All stator and pickup coil measurements were correct, as expected, so it's simply a dead B module it appears.  The parts manual says it's a 965359 but the modules actually say 965358 on them.  They're both sitting on the desk, and I'll call Lockwood in the morning to arrange testing and replacement as needed. 

    Rusty

     

    24348_2_SS2019 0460.jpg (You do not have access to download this file.)

  • Re: 912UL one ignition dead

    by » 4 months ago


    You probably already have your B module issue solved by now. I had the same thing exactly going on and was ready to replace the B module and when after getting the A module off the top of the B  and unplugged I discovered that the 6 pin plug coming out of B came un plugged way to easy. I then made sure it was snapped back together and zip tied it to make sure.This solved the problem. Also, Lockwood Aviation is Great in price and technical help and service! This was in a RV 12 with 550 hours.


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