VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 08-08-2020, 08:32 PM
ChrisMcC ChrisMcC is offline
 
Join Date: Mar 2014
Location: Colorado Springs
Posts: 7
Default PMag Leads are Loose

My PMag leads (at the mag) are not confidence-inspiring. They slip on, but do not have the comforting "snap" fitting like at the plugs. On take-off roll today, one came loose, the engine began sputtering, and I aborted the takeoff.

Is there a way to more securely attach the leads to the mag?

Thank you!
__________________
Chris McClernon
Colorado Springs, CO (KFLY)
RV-7 N174FM

Last edited by ChrisMcC : 08-08-2020 at 08:39 PM.
Reply With Quote
  #2  
Old 08-08-2020, 09:18 PM
Scott Hersha Scott Hersha is offline
 
Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 1,539
Default

I agree, its a weak connector that is used on the Pmags. Do yourself a favor and tin the ends of the wires that slip into the connector. The screw clamps on the connector squishes the stranded wire, and tinning the end first prevents that and makes a more secure connection. You can really crank down tightly on those screws if you do it this way, without breaking any of the ends of the strands.
__________________
SH
RV6/2001 built/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Sold(sadly)
RV4/bought 2019 Flying
Cincinnati, OH/KHAO
JAN2020
Reply With Quote
  #3  
Old 08-08-2020, 10:30 PM
Toobuilder's Avatar
Toobuilder Toobuilder is offline
 
Join Date: Jul 2009
Location: Mojave
Posts: 4,613
Default

I think the OP is talking about the spark plugs leads on the coil tower. A bit of vasaline on the boot and a conscious effort to seat the boot as far as possible on the tower (rather than the terminal) will help. There are millions and millions of cars with this coil/wire connection and they don't fall off.

If not, and he's talking about the primary wiring connector, then crimping a brass tube/ferrule on the end of the wire gives the screw something to bite onto without creating the brittle segment of wire solder can cause.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

Michael Robinson
______________
Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
Reply With Quote
  #4  
Old 08-09-2020, 05:20 AM
Kyle Boatright Kyle Boatright is offline
 
Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,187
Default

If the wires easily slide on/off the coil, you've got wear in the system. Either the wire ends, the coil posts, or both. I don't exactly remember the tactile feel you should get (maybe two light clicks as a wire goes into place), but I noticed this issue on my the last condition inspection and replaced both the wires and coil to correct the situation.
__________________
Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
Reply With Quote
  #5  
Old 08-17-2020, 02:43 PM
isosceles isosceles is offline
 
Join Date: Jan 2018
Location: Fremont
Posts: 59
Default emagair service notes

Did you check emag air service notes?

https://emagair.com/service-notes/


Quote:
Plug Wire Terminal Coil Connection

Importance High.

Background: We have recent reports of certain ignition leads having reduced retention force at the coil termination on the back of the ignition...
Reply With Quote
  #6  
Old 08-17-2020, 03:10 PM
Carlos151's Avatar
Carlos151 Carlos151 is offline
 
Join Date: Jan 2008
Location: Lebanon, TN
Posts: 270
Default +1 for checking with Emag

Last year I ordered a new pMag with a wire set. Then I received a notice from them that some of the wire sets were shipped out with weak connectors that would not snap into place on the pMag or the plugs. After calling them, they had me send my set back in and I soon received a new set of plug wires at no cost. Give 'em a call, they're great to work with.
__________________
Karl Richcreek
RV-8
N151TK "La Otra Chica"
Flying as of August 14, 2015
TN26
Reply With Quote
  #7  
Old 08-17-2020, 03:35 PM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 9,433
Default

Be cautious about using a lubricant on plug boots. Although it tends to make them air tight and moisture proof, it can also allow the boot/connector assembly to rotate slightly on the coil post due to vibration...the boot doesn't grip the tower or plug as dry silicone would. I've seen some really worn connectors, as well as things like spark plug caps with grooves cut in them.

The p-mag coil is a Ford part. E-mag owners are unlikely to change it for the previous style, which is electrically equivalent, but for those going with an EDIS-base system, the early coil uses wire caps with positive retention.
-
Attached Thumbnails
Click image for larger version

Name:	early coil.jpg
Views:	97
Size:	114.8 KB
ID:	1388  
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #8  
Old 08-17-2020, 04:25 PM
Larry DeCamp's Avatar
Larry DeCamp Larry DeCamp is offline
 
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 983
Default Just something to consider

Based on past input from the forum, I use Fuel Lube as a dielectric lubricant for Pmag plug boots and it is very hard to get them off and they are clearly moisture occlusive, just a thought.
__________________
Larry DeCamp
RV-3B flying w/7:1 0320 / carb / Pmags / Catto 3b / digital steam
RV-4 fastback w/ Superior roller 360/AFP/G3X/CPI/Catto3b
Clinton, IN
Reply With Quote
  #9  
Old 08-17-2020, 07:28 PM
Doug Rohrer Doug Rohrer is offline
 
Join Date: May 2009
Location: Bowling Green, KY
Posts: 292
Default Another Loose Lead

To add another data point, I had a Pmag lead fall off at the mag end on my new engine. Did not notice it because misfire was masked by the other Pmag firing the other plug. I also found a loose, but not disconnected lead on the other Pmag. I will be calling Emag about this. I believe my leads were made in the suspect time period.
__________________
Doug Rohrer
Bowling Green, KY
Reply With Quote
  #10  
Old 08-21-2020, 01:18 PM
Doug Rohrer Doug Rohrer is offline
 
Join Date: May 2009
Location: Bowling Green, KY
Posts: 292
Default Update

I contacted Brad at Emagair and explained my problem. He quickly agreed to send me two replacement wire sets at no cost. Because the coil ran for a while with the wire disconnected, he said the coil is now suspect and he is sending a replacement coil as well. Great customer service.
__________________
Doug Rohrer
Bowling Green, KY
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 11:40 PM.


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.