timing
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=49484
Printed Date: 22 Aug 2025 at 5:41pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: timing
Posted By: chal
Subject: timing
Date Posted: 23 Apr 2012 at 5:19pm
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Hi everyone I have a allis b with lucas magneto sr4 on it wanted to know is there a way to time the two gears in the magneto i set num 1 cyl on compression stroke firing @ tdc with magneto clicking it will start with a little pull and run fine but will not start with the handle any ideas? cheers
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Replies:
Posted By: CTuckerNWIL
Date Posted: 23 Apr 2012 at 5:24pm
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When you crank it by hand, can you hear the impulse snap in the mag? Sometimes if the impulse isn't working, they don't start well cranking but will start and run fine with a pull.
------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: chal
Date Posted: 24 Apr 2012 at 12:39pm
| Yes magneto is clicking @ tdc |
Posted By: Guests
Date Posted: 24 Apr 2012 at 1:11pm
| Not for sure about a Lucas Mag. A Bosch, Wico , and Fairbanks Morse compensate the needed timing by retarding the spark the necessary amount to allow for crank starting. During that same process, (impulse snap) it then immediately snaps forward under spring pressure to create the needed speed to power the coil and condenser to create a ggod spark when operating correctly. It sounds to me like the Lucas mag is not creating the needed timing compensation to allow it to start at slow turning speed, but it is ok when turned at a higher speed. Explaining why it is ok on the pull start. Either that or the coil in the mag could also be weak, but has enough to go when the spinning speed is fast enough. |
Posted By: CTuckerNWIL
Date Posted: 24 Apr 2012 at 3:15pm
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I think I would try to find a known good mag to swap out and try it. ------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: chal
Date Posted: 24 Apr 2012 at 4:45pm
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I finely found out wat was wrong num2 & num3 plug leads were on wrong round Tanks for the relys
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Posted By: CTuckerNWIL
Date Posted: 24 Apr 2012 at 6:08pm
 
------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |