VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #1  
Old 02-07-2021, 07:09 PM
werxcv01's Avatar
werxcv01 werxcv01 is offline
 
Join Date: Aug 2008
Location: Brandon, MS
Posts: 105
Default p-Mag inop on mag check

RV-8, Lycoming O-360, one Slick magneto, one P-Mag model 113. New plugs on both 6 months and 26 hours ago. Auto plugs are the solid terminal ones. Today on run up, the engine lost all power when switching to R for the P-Mags. The aircraft has an Off\Right\Left\Both\Start switch with a separate toggle switch to remove ship power from the P-Mag to check the internal alternator. At the hangar, the LED on the P-Mag was red with the master on then dark with the ignition switch on. The P-Mag was last serviced at the factory 3/2017 - rebuilt, recalibrated, and Q.C.’d. I am not the builder. A reading through the installation manual did not help. Any thoughts would be appreciated.
__________________
Sold -6A, flying an 8 & a C182RG. Donated for 2021.
Reply With Quote
  #2  
Old 02-07-2021, 09:54 PM
rv8ch's Avatar
rv8ch rv8ch is online now
 
Join Date: Feb 2005
Location: LSGY
Posts: 3,757
Default

Quote:
Originally Posted by werxcv01 View Post
... A reading through the installation manual did not help. Any thoughts would be appreciated.
I'd get your ohm-meter out there and see if you have the right connections to the green connectors on the pmag.

This is from Page 26 on the manual I have:

Click image for larger version

Name:	pmag wiring from manual page 26.png
Views:	55
Size:	245.9 KB
ID:	8073

The Troubleshooting guide seems to show that the LEDs are indicating all is ok based on what you wrote. Perhaps confirm with a helper that you get the light burst when you power it on. My money's on a wiring issue, perhaps with the key switch.
__________________
Mickey Coggins
http://rv8.ch
"Hello, world!"
Reply With Quote
  #3  
Old 02-07-2021, 10:04 PM
werxcv01's Avatar
werxcv01 werxcv01 is offline
 
Join Date: Aug 2008
Location: Brandon, MS
Posts: 105
Default

Thanks. The airplane has a few hundred hours with the current set up so I believe the wiring would be correct but the suggestion about the switch may be helpful. A couple of times the master has not powered on the first time I flipped it. Probably need to check the master, key switch, and P-Mag wiring.
__________________
Sold -6A, flying an 8 & a C182RG. Donated for 2021.
Reply With Quote
  #4  
Old 02-07-2021, 10:21 PM
rv8ch's Avatar
rv8ch rv8ch is online now
 
Join Date: Feb 2005
Location: LSGY
Posts: 3,757
Default

Quote:
Originally Posted by werxcv01 View Post
Thanks. The airplane has a few hundred hours with the current set up so I believe the wiring would be correct but the suggestion about the switch may be helpful. A couple of times the master has not powered on the first time I flipped it. Probably need to check the master, key switch, and P-Mag wiring.
There have been reports of wires that are not properly supported at the pmag end coming loose.

Also, probably a good idea to check the timing. If something bad happened and the timing is way off, it would also look like it's not working when you do the mag check. It's an easy process if you have not done it yet. Take care when moving the prop.
__________________
Mickey Coggins
http://rv8.ch
"Hello, world!"
Reply With Quote
  #5  
Old 02-08-2021, 09:04 AM
John Tierney John Tierney is offline
 
Join Date: Jan 2006
Location: Vonore, TN
Posts: 448
Default

Check the connections on the back of the key switch. I had a screw back off of the terminals on the key switch. For me it was the starter. The wiring was tight and I would get intermediate contact between the ring terminal and the switch contact on the back. Found the tiny screw on the floor under the carpet.
__________________
John Tierney
Vonore, TN
RV-7A - N777JT Flying
Reply With Quote
  #6  
Old 02-08-2021, 09:11 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,951
Default

I note that VAF gets a lot of posts on “ignition switch issues” - especially when going to one or more EIs.

After being stranded with a spam can caused by a finicky ignition switch I decided to never use one in my planes - and have not.

So for you still building (or those getting ready to update your panel) ditch this 1960 Cessna leftover and just use simple toggle switches for ignition and a push start button. This goes for whatever type of ignition you run.

While you are at it, also ditch the stupid split master/alt switch.

Carl
Reply With Quote
  #7  
Old 03-17-2021, 05:08 PM
KLax18 KLax18 is offline
 
Join Date: Jul 2020
Location: Ripon ca
Posts: 21
Default

Give Brad Dement a call at E-mag. He just helped walk through an install and troubleshooting sequence on P-mag (114- new version). He can tell a lot from what you share with him.
Reply With Quote
  #8  
Old 03-17-2021, 05:20 PM
werxcv01's Avatar
werxcv01 werxcv01 is offline
 
Join Date: Aug 2008
Location: Brandon, MS
Posts: 105
Default

Quote:
Originally Posted by KLax18 View Post
Give Brad Dement a call at E-mag. He just helped walk through an install and troubleshooting sequence on P-mag (114- new version). He can tell a lot from what you share with him.
I ended up shipping the mag to E-Mag for an overhaul. The circuit board had to be replaced. They quickly turned the unit around and got it back to me. Check out my “Don’t do this” thread for more details.
__________________
Sold -6A, flying an 8 & a C182RG. Donated for 2021.
Reply With Quote
  #9  
Old 04-11-2021, 04:22 PM
D Weisgerber's Avatar
D Weisgerber D Weisgerber is offline
 
Join Date: Sep 2019
Location: Ionia Michigan
Posts: 243
Default

What did it cost to have the circuit board replaced?
__________________
RV6 N7219d
IO-320-B1A
Sam James cowl
first flight May 2, 1997
RV8 #83830 tail done, wing done, fuselage done.
Working on the finish kit.
Reply With Quote
  #10  
Old 04-11-2021, 07:19 PM
werxcv01's Avatar
werxcv01 werxcv01 is offline
 
Join Date: Aug 2008
Location: Brandon, MS
Posts: 105
Default

Quote:
Originally Posted by D Weisgerber View Post
What did it cost to have the circuit board replaced?
$640 plus shipping
__________________
Sold -6A, flying an 8 & a C182RG. Donated for 2021.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 05:34 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.