Antique Engines and Old Iron
[Home] - [HELP] - [Forums] - [Groups] - [Classified Ads] - [Subscribe] - [Books] - [Sponsors] -

Go Back   SmokStak > SmokStak® Antique Engine Community > Magnetos, Ignition Coils and Spark Plugs
Forgot Password? Join Us!

Notices

Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Associated mag - no spark


this thread has 6 replies and has been viewed 430 times

Reply
 
Thread Tools Display Modes
  #1  
Old 09-27-2019, 09:25:00 PM
highpockets003 highpockets003 is offline
Registered
 
Join Date: Sep 2009
Location: ABQ, NM
Posts: 103
Thanks: 38
Thanked 19 Times in 12 Posts
Question Associated mag - no spark

My Associated 1.75hp was running at the show fine. Came time to oil it, so I squirted a drop here and there - at the mag gear and skew gear, I accidentally got the small oiler tip between the 2 gears for a split second - oops. They kinda munched on the oiler tip, and immediately the engine coasted to a stop.


Tested the mag at home and still no spark (engine does run on battery & coil). Disassembled the mag, measured the coil core at 6.0 ohms; seems reasonable. Each magnet will pickup one of the mag's side plates and hold it. I did have too much wet oil in the brass bushings, at each end of the mag; remedied.


Put the mag on the lathe and tested with 12vdc light bulb, 70-300 rpm; no illumination. I did notice when touching the light bulb lead to the coil's back end brass plunger while the mag is rotating, there is a small blue spark that jumps to the lead (using the mag body as ground). Measured the AC voltage output at the brass plunger; 7-9VAC. Check with light bulb again - and no illumination.


Don't know what I've done to the mag. The coil measures a continuous 6 ohms any time I check it. The magnets seem okay. The coil rotor is NOT touching the side plates while rotating.


Ideas why the mag won't produce a spark?



Thanks!
Reply With Quote
Sponsored Links
  #2  
Old 09-27-2019, 11:03:02 PM
ulgydog56's Avatar
ulgydog56 ulgydog56 is offline
Registered
 
Join Date: Dec 2017
Location: Smithcreek, Michigan
Posts: 834
Thanks: 197
Thanked 396 Times in 290 Posts
Default Re: Associated mag - no spark

is the oil acting as a conductor ?
Reply With Quote
  #3  
Old 09-28-2019, 02:21:53 AM
cobbadog cobbadog is offline
Registered
 
Join Date: Aug 2009
Location: Coopernook. N.S.W. Australia
Posts: 1,947
Thanks: 3,482
Thanked 881 Times in 585 Posts
Default Re: Associated mag - no spark

Sounds as if oil has got to a place where it should not be and is shorting to ground. A strip down and a good clean up and then check any and all wires just in case they are shorting for any reason.
Good luck with it and let us know how you get on.
Reply With Quote
  #4  
Old 09-28-2019, 08:58:51 AM
DavidRaines DavidRaines is offline
Subscriber
 
Join Date: Sep 2005
Location: Kearney, Missouri, USA
Posts: 842
Thanks: 446
Thanked 906 Times in 324 Posts
Default Re: Associated mag - no spark

I would try and clean the pickup and brass parts. If oil gets on the pickup you won’t have spark. First engine I got had this problem.
Reply With Quote
  #5  
Old 09-28-2019, 09:30:47 AM
Turbo's Avatar
Turbo Turbo is offline
Subscriber
 
Join Date: Dec 2006
Location: Heron Lake, Minnesota, USA
Posts: 1,157
Thanks: 672
Thanked 1,138 Times in 480 Posts
Default Re: Associated mag - no spark

7-9 Volts AC is about what they put out. I have never tried to light up a light bulb with one so I don't know if that is possible. I think what happened is when the oiler tip went through the mag gears the shaft slipped in the armature changing the timing. Check the armature drive shaft for any play. If you don't find any re-time the mag and try again. Here is how I test for spark: Take the output wire and rest it on the mag gear while spinning. If you see sparks it will run.
Reply With Quote
  #6  
Old 09-30-2019, 02:12:54 PM
highpockets003 highpockets003 is offline
Registered
 
Join Date: Sep 2009
Location: ABQ, NM
Posts: 103
Thanks: 38
Thanked 19 Times in 12 Posts
Smile Re: Associated mag - no spark

Because I can't read and absorb destructions well from Harry's Old Engine webpage, I didn't time the mag correctly. The destructions clearly state the mag's L rivet indentation should be centered "...when the igniter snaps...".

I was incorrectly timing the L indentation with the crank's and cam's timing marks.

The engine started up on the first crank.
Reply With Quote
The Following 3 Users Say Thank You to highpockets003 For This Post:
  #7  
Old 10-01-2019, 02:13:49 AM
cobbadog cobbadog is offline
Registered
 
Join Date: Aug 2009
Location: Coopernook. N.S.W. Australia
Posts: 1,947
Thanks: 3,482
Thanked 881 Times in 585 Posts
Default Re: Associated mag - no spark

Glad you got it sorted and that it runs again. I know what you mean in understanding 'destructions'. I have been playing with our vintage David Brown and the terminology that the Poms used back in 1954 is totally different to what we call things here in Oz. Even had an issue re wiring the tractor after a restoration and wondered why it was not working at all. Then I remembered the bloody thing is + earth, swapped a few wires about and all was good.
Reply With Quote
Reply

Bookmarks


Thread Tools
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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

F o r u m Jump

Similar Threads Chosen at Random
Thread Thread Starter F o r u m Replies Last Post
IHC H4 no spark DTurner Magnetos, Ignition Coils and Spark Plugs 1 03-04-2016 02:03:58 AM
IHC M 1 1/2 hp without spark pson68 Hit & Miss Gas Engine Discussion 14 12-07-2014 08:48:10 AM
Slick electro mdl 56 magneto on Continental FS162. Spark then no spark Greenbuggy Magnetos, Ignition Coils and Spark Plugs 2 06-29-2014 06:23:31 PM
Briggs WMB Spark at Wire but Can't See Spark at Plug KubotaDiesel Small Air Cooled Gasoline Engines 15 05-05-2014 11:15:05 AM
Why doesn't the spark-spark? flasks Magnetos, Ignition Coils and Spark Plugs 4 01-02-2009 01:49:20 AM


Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 06:43:42 AM.

Smokstak and Enginads site search!


All use is subject to our TERMS OF SERVICE
SMOKSTAK® is a Registered Trade Mark - A Community of Antique Engine Enthusiasts
Copyright © 2000 - 2019 by Harry Matthews P.O. Box 5612 - Sarasota, FL 34277