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magneto problems

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barrie

Joined: 19 May 2017
Posts: 4
Location: nova scotia

Posted: Fri May 19, 2017 4:14 pm Post subject: magneto problems

Hi, I have just finished an engine install in my homebuilt and have a problem with the Mags(probably of my own doing). After starting and checking for mag a drop, the left mag somehow appears to be grounded. The engine starts ok and the left mag has the impulse so I am assuming that it was working alright to begin with. Also the right one is working just fine.  I am sure that I have overlooked something but just haven't been able to figure it out. Does anybody have the magic solution?

Thanks

Barrie

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Fri May 19, 2017 6:06 pm Post subject: magneto problems

Are you certain that you had the engine at TDC on the compression stroke 

when you installed the left mag? You can get your symptoms if the mag is 

installed on the non-firing stroke.



On 5/19/2017 5:14 PM, barrie wrote:

 	  Quote: 	
		   

 

 Hi, I have just finished an engine install in my homebuilt and have a problem with the Mags(probably of my own doing). After starting and checking for mag a drop, the left mag somehow appears to be grounded. The engine starts ok and the left mag has the impulse so I am assuming that it was working alright to begin with. Also the right one is working just fine. [Question] I am sure that I have overlooked something but just haven't been able to figure it out. Does anybody have the magic solution?

 Thanks

 Barrie

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=469448#469448

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

barrie

Joined: 19 May 2017
Posts: 4
Location: nova scotia

Posted: Fri May 19, 2017 6:15 pm Post subject: Re: magneto problems

Yes, positive. I took a lot of care when doing the installation

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JohnCiolino(at)carolina.r
Guest

Posted: Sat May 20, 2017 1:52 am Post subject: magneto problems

Barrie,



You probably used shielded wire for the P-lead. Check that the shield wire

is not touching the terminal. 



John Ciolino

Bearhawk Patrol



--

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joerhenry(at)suddenlink.n
Guest

Posted: Sat May 20, 2017 5:49 am Post subject: magneto problems

It can be difficult to time a mag with an impulse coupling. The impulse coupling must  be disengaged or the timing will be incorrect. You should turn the prop in direction of rotation enough to hear the coupling snap. Then you can turn backwards to set the timing advance but not so much to reset the impulse coupling.  jrh

---- John Ciolino <JohnCiolino(at)carolina.rr.com> wrote: 

[quote] 

 

 Barrie,

 

 You probably used shielded wire for the P-lead. Check that the shield wire

 is not touching the terminal. 

 

 John Ciolino

 Bearhawk Patrol

 

 --

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barrie

Joined: 19 May 2017
Posts: 4
Location: nova scotia

Posted: Sat May 20, 2017 8:56 am Post subject: Re: magneto problems

Just got back from the aircraft. Timing is on the #1 compression stroke and the p leads are not grounding at the terminals. I'm just wondering if the engine would start right up on the right mag and the left one isn't working at all  Thinking back when we originally started the engine it fired right up but after going over the system I did put the bridge in place to ground the right mag when starting. The next startup did take a bit of cranking and I think that it caught just when the starter was released(not sure about that). I guess what I am asking is would the engine start even without impulse.

If not I will still be scratching my head.

Barrie

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barrie

Joined: 19 May 2017
Posts: 4
Location: nova scotia

Posted: Sat May 20, 2017 12:19 pm Post subject: Re: magneto problems

Hi Kelly & John,

Got it  Had a short on the p lead where it enters the mag. The wire was exposed and grounding on the shield. Thank's for the input.

Barrie

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