Tutorial for how to time magnetos?

alpinelakespilot2000 · #1 05-20-2013, 04:52 PM

Does anyone know where there might be a good tutorial on how to time magnetos? I didn't see anything in the archives, and the only EAA webinar I can find is a short 6-8 min. video that doesn't show the mags on the aircraft or how to align the prop to find the proper BTDC location, etc. Aerosport installed them originally and I'm now knee deep in my first condition inspection, needing to be walked through this part of it.
Thanks.

Andrew M · #2 05-20-2013, 06:17 PM

A quik you tube search shows a bunch of timing videos. I presume you are talking about external timing. (timing the mag to the engine) as apposed to internal timing (making the point open in relation to the magnet position) I am not current with recips, but if I recall correctly, the external timing is checked, and as long as it is within a degree or maybe two, then the internal timing is O.K. Rotating the mag to correct is acceptable. If it is out more than that then it indicates an internal timing issue due to worn points. It really helps to know exactly how close it was timed to begin with, and if any adjustment were made to correct worn points.
Slick or Bendix?

ArlingtonRV · #3 05-20-2013, 06:18 PM

There are a couple of usable videos on YouTube.

http://www.youtube.com/watch?v=0IcCLXpR0Bk

There was another one that was pretty good, looked like an old timey training video, but I can't find it right now. There is also pretty comprehensive information available at:

http://www.avweb.com/news/maint/184370-1.html

turbo · #4 05-21-2013, 05:45 AM

eaa video

alpinelakespilot2000 · #5 05-21-2013, 08:32 AM

Quote:

Originally Posted by turbo

eaa video

Thanks. I saw the Mike Busch EAA video. He offers a lot of good stuff about the mags but doesn't actually show the process for timing them to the engine, which is what I'm looking for. The short YouTube video Steve linked to above is close, just a bit too short to be real helpful. Still looking, but thanks for the suggestions so far.

az_gila · #6 05-21-2013, 09:35 AM

Not a video, but this previously posted link to AvWeb should give you what you need...

http://www.avweb.com/news/maint/184370-1.html

turbo · #7 05-21-2013, 09:37 AM

steve, drop me a pm with your phone # and maybe i can help you get the info you need.

cln1owner · #8 05-21-2013, 12:47 PM

Steve,

Do you think your timing has changed? What kind of problems are you having?

alpinelakespilot2000 · #9 05-21-2013, 01:41 PM

Quote:

Originally Posted by cln1owner

Steve,

Do you think your timing has changed? What kind of problems are you having?

No issues, Nate. Just have it on the checklist of things to check at annual.

Ron B. · #10 05-21-2013, 06:57 PM

I was reading up on timing as I just did mine tonight. I read not to re-use a mag gasket if at all possible. I'm wandeing if they are refering to re-use if the gasket is removed or are they refering to replacement everytime the timing is adjusted. I've never replaced a gasket when adjusting. Tonight I adjusted the starboard mag from 26 back to 25 degrees.
Thanks Ron