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Rotax 912 run on

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stranfaer(at)btinternet.c
Guest

Posted: Wed Dec 05, 2007 12:56 pm Post subject: Rotax 912 run on

We have of late been experiencing a run on with the engine after switching 

off!

The only way we have been able to shut down has been by turning off the 

fuel.



It does not do it evrytime, however the instances are becoming more 

frequent, I have only subscribed to the list for just over a year and dont 

recall any other instances?



However if there are any ideas or suggestions I would be gratefull?



rgds

David J Joyce B-BWON

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terrys(at)cisco.com
Guest

Posted: Wed Dec 05, 2007 1:06 pm Post subject: Rotax 912 run on

Hi,



We used the typical mag switch from Aircraft Spruce, and now with 500

hours on it, we have had the occasion when it will not shut off the

engine.  It seems to be dirty contacts in the switch, which is supposed

to short both mag wires to ground.  Moving the switch to on, then back

to off eventually cures the problem.



Regards,

Terry Seaver

A135 / N135TD

--

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paul.the.aviator(at)gmail
Guest

Posted: Wed Dec 05, 2007 1:21 pm Post subject: Rotax 912 run on

Hi Dave,



I had this on my 914 and it turned out to be  a partially broken mag

wire.  It was right at the crimp connector.  The wire on those modules

isn't too good.



Paul

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rlborger(at)mac.com
Guest

Posted: Wed Dec 05, 2007 1:40 pm Post subject: Rotax 912 run on

David,



Most likely, one (or both) mags are not being properly shorted to ground when switched off.  Do you get a proper mag check?  That is, do you get a RPM drop when you check Mag A and Mag B individually on your run up mag checks?  If you do not, then one of the mags has a bad ground wire.  If you do get a proper RPM drop on both Mags, then your switch does not properly ground one or both mags when switched off.  Check the switch connections in the off position to make sure both mag wires have continuity to ground.



Let us know what you find.



Great flying,

Bob Borger



 

On Wednesday, December 05, 2007, at 03:12PM, "David Joyce" <stranfaer(at)btinternet.com> wrote:

 	  Quote: 	
		  



We have of late been experiencing a run on with the engine after switching 

off!

The only way we have been able to shut down has been by turning off the 

fuel.



It does not do it evrytime, however the instances are becoming more 

frequent, I have only subscribed to the list for just over a year and dont 

recall any other instances?



However if there are any ideas or suggestions I would be gratefull?



rgds

David J Joyce B-BWON

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

rparigor(at)suffolk.lib.n
Guest

Posted: Wed Dec 05, 2007 2:25 pm Post subject: Rotax 912 run on

Hello David



"We have of late been experiencing a run on with the engine after

switching off! It does not do it evrytime, however the instances are

becoming more frequent" 



As mentioned, check switch, connections and wires first. If still doing

it, I have heard if you get ignition modules hot, the first symptom is you

can not turn off motor. Wrong time of year to first manifest??



On 914 anyway, you can swap ignition modules for a test, but it is not

recommended to leave it that way, may help a bit in narrowing down

problem.



Ron Parigoris

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jeff(at)rmmm.net
Guest

Posted: Wed Dec 05, 2007 2:56 pm Post subject: Rotax 912 run on

David,

I just went through this last summer and as Paul said it's probably at 

the mags. The wire coming out of them is very cheep and needs a pig 

tail of quality tefzel (Not sure of that spelling) wire. We then 

soldered the ground wires direct to the pigtails and the problem has 

never come back. Make sure you tie wrap the pigtails and put some 

shrink tubing at the solder joint. Vibration is your enemy right at the 

mag. A partially broken wire gave me fits until this list told me to 

look there.

Regards,

Jeff R.

A258 - N128LJ / Gold Rush 96 hours and climbing slowly.



On Dec 5, 2007, at 2:54 PM, David Joyce wrote:



 	  Quote: 	
		   

 <stranfaer(at)btinternet.com>



 We have of late been experiencing a run on with the engine after 

 switching off!

 The only way we have been able to shut down has been by turning off 

 the fuel.



 It does not do it evrytime, however the instances are becoming more 

 frequent, I have only subscribed to the list for just over a year and 

 dont recall any other instances?



 However if there are any ideas or suggestions I would be gratefull?



 rgds

 David J Joyce B-BWON

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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rehn(at)rockisland.com
Guest

Posted: Wed Dec 05, 2007 3:33 pm Post subject: Rotax 912 run on

I would put my money on this as the cause! I also have seen this and talked

to 912 and 914 drivers with the same. Tie all those wires tight after

fixing!

Jerry



--

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stranfaer(at)btinternet.c
Guest

Posted: Thu Dec 06, 2007 4:15 pm Post subject: Rotax 912 run on

Thanks for all the replys, I will check the results and report back to the 

list....

rgds

David J Joyce G-BWON

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