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Timing

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jbowerman(at)fastspot.net
Guest

Posted: Thu Jun 19, 2008 8:44 am Post subject: Timing

I have installed a new left magneto on my Yak52 and tried to time it to the Right mag.  It is about 5 degrees off and I have no more adjustment on the studs.  The aircraft seemed to be running fine on the right mag, so the assumption was that it was timed correctly.  

   

 One other item, I know where the timing marks are on the prop hub, but don’t know where the marks are on the engine.  Can anyone help me with the location of the timing mark on the engine case?  

   

Thanks in advance,  

Jim Bowerman N52YA  

       [quote][b]

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petervs(at)knology.net
Guest

Posted: Thu Jun 19, 2008 10:01 am Post subject: Timing

Just find TDC on Cylinder 1 and make a pointer that you can attach to the gills to point to the O degree mark on the prop hub.  

   

Pete  

       

From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Jim Bowerman

 Sent: Thursday, June 19, 2008 11:42 AM

 To: yak-list(at)matronics.com

 Subject: Timing  

  

  

   

I have installed a new left magneto on my Yak52 and tried to time it to the Right mag.  It is about 5 degrees off and I have no more adjustment on the studs.  The aircraft seemed to be running fine on the right mag, so the assumption was that it was timed correctly.  

   

 One other item, I know where the timing marks are on the prop hub, but don’t know where the marks are on the engine.  Can anyone help me with the location of the timing mark on the engine case?  

   

Thanks in advance,  

Jim Bowerman N52YA   	  Quote: 	
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dsavarese0812(at)bellsout
Guest

Posted: Thu Jun 19, 2008 12:26 pm Post subject: Timing

Jim,

 Timing a new magneto can be somewhat of a challenge.  If  you have a copy of the M14 maintenance manual, it is highly recommended you go  through the installation procedure for a new magneto which is on page 205,  Task Card 202.  Trying to explain this on the yak list is difficult to say  the least.  Basically though, there are 3 timings that you must go  through;  raw, course and fine.

  

 Raw timing - setting the coupling on the bottom of the magneto  to the correct position prior to installing the magneto.

 Course timing - adjustment of the magneto by rotating the  magneto in the slotted holes.

 Fine timing - adjustment of the plate to which the points are  mounted by the eccentric screw on the opposite side of the points.

  

 It is important that you following the procedure in the manual  starting with the setting of the coupling.  Otherwise you will be chasing  your tail for a very long time.

  

 Using a magneto synchronizer/timing box and after you have the  mags firing fairly close to each other, you can tweak the timing or synchronize  the mags using the concentric adjustment screw on the opposite side of the  points.  You must loosen the large slotted screws on the sides of the plate  first.  Do not loosen the small slotted screws as these are loosened to  adjust the point gap. (.25 to .35 mm or .010 to .014).  Point gap will also  affect the timing position.  But the most important thing to do is to set  the coupling on the bottom of the mag as instructed in Task Card  202.

  

 Dennis

  

  

  

 [quote]   ---

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dsavarese0812(at)bellsout
Guest

Posted: Thu Jun 19, 2008 12:30 pm Post subject: Timing

That's correct Peter, but ONLY if the magneto has been  properly timed BEFORE installing it.  ie: setting the coupling on the  bottom of the mag to the correct position as stated in the M14P manual, pg 205  Task Card 202.

 Dennis

  

 [quote]   ---

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dsavarese0812(at)bellsout
Guest

Posted: Thu Jun 19, 2008 12:36 pm Post subject: Timing

BTW, you don't time the mags to cylinder #1.  They  are timed to cylinder #4.

 Dennis

  

 [quote]   ---

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mark.bitterlich(at)navy.m
Guest

Posted: Thu Jun 19, 2008 12:44 pm Post subject: Timing

Jim, there are many adjustment points on these MAGS.  



Remove the MAG from the engine.  Look on the bottom of the MAG for the

coupling.  This coupling is really slick.  You will notice that if you

loosen one bolt that holds it on, you can turn the OTHER bolt and it

will move the whole coupling on the MAG shaft. Look carefully at this

thing, it is an ADJUSTABLE MECHANISM!   Since you already know which

direction you need to go on the screw slots to get the 5 degrees more

that you need, you should be able to look at that coupling shaft and

adjust it in the correct direction.  Be careful, a small adjustment goes

a long way.  You can then put the mag back onto the engine, and try to

sync the darn thing.  By a lot of trial and error, you can even end up

getting it synced with the screw slot holes for the mag itself "in the

middle" per se.  Lastly, there is a fine tuning screw opposite of the

points themselves.  This is one of those "egg shaped" deals that as you

turn it, it moves the assembly.  I think it is actually moving the

breaker plate for the points.  This is kind of the way that a vacuum

advance breaker plate advances the timing on a automobile distributor.  



ANYWAY... With that knowledge, and a lot of time and patience you can

get from to your goal.  It's not a lot of fun, but it is a worthwhile

learning experience.  



Mark Bitterlich

 



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mark.bitterlich(at)navy.m
Guest

Posted: Thu Jun 19, 2008 12:45 pm Post subject: Timing

I can't believe we were typing an answer to this at the same time

Dennis.  Sheesh.  Your answer was better than mine.  



Mark

 



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petervs(at)knology.net
Guest

Posted: Thu Jun 19, 2008 1:28 pm Post subject: Timing

Absolutely!  

   

Peter  

       

From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of A. Dennis Savarese

 Sent: Thursday, June 19, 2008 3:25 PM

 To: yak-list(at)matronics.com

 Subject: Re: Timing  

  

  

     

That's correct Peter, but ONLY if the magneto has been properly timed BEFORE installing it.  ie: setting the coupling on the bottom of the mag to the correct position as stated in the M14P manual, pg 205 Task Card 202.  

    

Dennis  

    

   

   	  Quote: 	
		      

----- Original Message -----   

    

From: Peter K. Van Staagen (petervs(at)knology.net)   

    

To: yak-list(at)matronics.com (yak-list(at)matronics.com)   

    

Sent: Thursday, June 19, 2008 12:53 PM  

    

Subject: RE: Timing  

    

   

  

Just find TDC on Cylinder 1 and make a pointer that you can attach to the gills to point to the O degree mark on the prop hub.  

   

Pete  

       

From: owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Jim Bowerman

 Sent: Thursday, June 19, 2008 11:42 AM

 To: yak-list(at)matronics.com (yak-list(at)matronics.com)

 Subject: Timing  

  

  

   

I have installed a new left magneto on my Yak52 and tried to time it to the Right mag.  It is about 5 degrees off and I have no more adjustment on the studs.  The aircraft seemed to be running fine on the right mag, so the assumption was that it was timed correctly.  

   

 One other item, I know where the timing marks are on the prop hub, but don’t know where the marks are on the engine.  Can anyone help me with the location of the timing mark on the engine case?  

   

Thanks in advance,  

Jim Bowerman N52YA   	  Quote: 	
		    http://www.matronics.com/Navigator?Yak-Listhttp://forums.matronics.comhttp://www.matronics.com/contribution   href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-Listhref="http://forums.matronics.com">http://forums.matronics.com 	
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        [quote][b]

- The Matronics Yak-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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petervs(at)knology.net
Guest

Posted: Thu Jun 19, 2008 1:34 pm Post subject: Timing

DOH! You are so right, my bad.  

   

Guess I should keep my mouth shut!  

   

Thanks,  

   

Pete  

       

From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of A. Dennis Savarese

 Sent: Thursday, June 19, 2008 3:34 PM

 To: yak-list(at)matronics.com

 Subject: Re: Timing  

  

  

     

BTW, you don't time the mags to cylinder #1.  They are timed to cylinder #4.  

    

Dennis  

    

   

   	  Quote: 	
		      

----- Original Message -----   

    

From: A. Dennis Savarese (dsavarese0812(at)bellsouth.net)   

    

To: yak-list(at)matronics.com (yak-list(at)matronics.com)   

    

Sent: Thursday, June 19, 2008 3:25 PM  

    

Subject: Re: Timing  

    

   

    

That's correct Peter, but ONLY if the magneto has been properly timed BEFORE installing it.  ie: setting the coupling on the bottom of the mag to the correct position as stated in the M14P manual, pg 205 Task Card 202.  

    

Dennis  

    

   

   	  Quote: 	
		      

----- Original Message -----   

    

From: Peter K. Van Staagen (petervs(at)knology.net)   

    

To: yak-list(at)matronics.com (yak-list(at)matronics.com)   

    

Sent: Thursday, June 19, 2008 12:53 PM  

    

Subject: RE: Timing  

    

   

  

Just find TDC on Cylinder 1 and make a pointer that you can attach to the gills to point to the O degree mark on the prop hub.  

   

Pete  

       

From: owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Jim Bowerman

 Sent: Thursday, June 19, 2008 11:42 AM

 To: yak-list(at)matronics.com (yak-list(at)matronics.com)

 Subject: Timing  

  

  

   

I have installed a new left magneto on my Yak52 and tried to time it to the Right mag.  It is about 5 degrees off and I have no more adjustment on the studs.  The aircraft seemed to be running fine on the right mag, so the assumption was that it was timed correctly.  

   

 One other item, I know where the timing marks are on the prop hub, but don’t know where the marks are on the engine.  Can anyone help me with the location of the timing mark on the engine case?  

   

Thanks in advance,  

Jim Bowerman N52YA   	  Quote: 	
		    http://www.matronics.com/Navigator?Yak-Listhttp://forums.matronics.comhttp://www.matronics.com/contribution   href="http://www.matronics.com/Navigator?Yak-List">http://www.matronhref="http://forums.matronics.com">http://forums.matronics.comhref="http://www.matronics.com/contribution">http://www.matronics.com/c 	
 	
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        [quote][b]

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