Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Attention Forum Users: On the 28th of December 2023 at 9:00am Central Time, we will be taking the forums down for maintenance while we prepare the new forums for your use. Please click here for more information.

Allis Chalmers Discussion Forum
:

Starting a B

Welcome Guest, Log in or Register
Author 
Dave 39B

08-29-2007 14:51:21




Report to Moderator

Hey guys,just bought a 39 B the other day.Today I went through the carb.and drained the old gas out and cleaned the points.Hooked it up to the truck and went to pull start it,only pulled her about three feet and she jumped to life.Drove around a bit and tried all the gears and the pto,she worked great and purrs like a kitten.I shut her off and crank started it a couple of times,started a little hard(8 or 9 cranks
)for being warm so I put in new plugs.Tried to start her cold and got some pops and kicked back a couple fo times,checked to make sure the wires were right and tried some more cranks but I finally quit.Are there any tricks to starting these or should I go through the mag and put in points and condenser.Any ideas or help would be very welcome.
Thanks
Dave

[Log in to Reply]   [No Email]
DS Mi

09-02-2007 07:53:03




Report to Moderator
 Re: Starting a B in reply to Dave 39B, 08-29-2007 14:51:21  
sometimes we forget the simple thigs. make sure you have the throtle in the sweet spot. if throtle is all the way back, it might not start by hand my 2 cents. DSmi



[Log in to Reply]  [No Email]
Butch(OH)

08-30-2007 05:32:46




Report to Moderator
 Re: Starting a B in reply to Dave 39B, 08-29-2007 14:51:21  
With everything in good order and properly choked a B or C will start in 2-3 pulls cold. Realize that "proper" choking is an individual tractor thing, ususaly 1-2 choked then off however we owned one that needed no choke cold or not. When it starts easy remember how you did it. They will usualy start in a pull or two when warm. I have never owned nor personaly seen a crank start model B or C allis that would easily start whem hot such as killing it under load, pull start or let cool down. Crank kicking is not a design flaw and should not be considered "normal". To kick the hand crank backwards spark must occur before TDC and it should not be that way if things are right in the mag and it is timed correctly. This is covered in the service manuals. An easy field check is to make double sure that the impulse is not clicking before the TDC mark is centered in the timing window. If not and you dont have cross firing due to a bad cap the crank cant kick, period. A battery ignition equipped B is a differant animal. I would NEVER hand crank one due to the fact that they have lots of static advance (fires before TDC at cranking speeds).

[Log in to Reply]  [No Email]
Dick L

08-30-2007 07:24:04




Report to Moderator
 Re: Starting a B in reply to Butch(OH), 08-30-2007 05:32:46  
If the impulse dogs are wore just right they can release the spring to soon and fire. The timing can be correct and with the above happening it can and will fire early. When the impulse releases/clicks the rotor is some what free wheeling and will fire. What I gathered from the explainations is that by not noticing the click that the dog only cought some times and then he would get a spark then without the dogs catching there was no and can not be spark.

[Log in to Reply]  [No Email]
Dave 39 B

08-29-2007 18:55:03




Report to Moderator
 Re: Starting a B in reply to Dave 39B, 08-29-2007 14:51:21  
Thanks guys,I probably will have AIS go through it for me.I like doing things for myself but the first time I play with a mag I'll use one I don't need just in case I screw it up.Oh ya Old it hit me pretty good,I had my thumb out of the way but it came around before I got my hand clear and smacked the back of my hand.Won't be doin much heavy werk with my right hand fer a while.
Thanks again
Dave

[Log in to Reply]  [No Email]
Sid

08-29-2007 20:34:53




Report to Moderator
 Re: Starting a B in reply to Dave 39 B, 08-29-2007 18:55:03  
How I crank a tractor. Based on different manuals and what a mechanic taught me when I was a young know it all whippersnapper. Hold crank in left hand(do not wrap thumb around handle). Stand whith left hand on crank and pushing away from tractor with right hand. (You are facing across the front of tractor not facing the tractor.) Pulling up and over. If the tractors kicks back it will pull the crank out of your hand, and your right hand will push you back away from the spinnig crank. If you pull up and over with right hand the crank can spin back and get the back side of your hand. I have seen it done. I ain't saying you gotta do it my way, just saying that this is what I believe to be the safest way.

[Log in to Reply]  [No Email]
old

08-29-2007 18:58:32




Report to Moderator
 Re: Starting a B in reply to Dave 39 B, 08-29-2007 18:55:03  
By the way if you need a manual for that mag I have it on my computer and can send it to you if you send me an e-mail



[Log in to Reply]  [No Email]
old

08-29-2007 16:35:06




Report to Moderator
 Re: Starting a B in reply to Dave 39B, 08-29-2007 14:51:21  
I agree with Dick on this plus impluse not working like it should can also lead to a broken arm. Of course being a little out of time can also lead to a broken arm. I had a B get me once and I went to the hospital because of it and yes I was holding the crank the right way but it still got me

[Log in to Reply]  [No Email]
DaVE 39b

08-29-2007 15:42:00




Report to Moderator
 Re: Starting a B in reply to Dave 39B, 08-29-2007 14:51:21  
Forgot to mention this in my last reply,really nice page on mag timing Dick,I made sure to print it out and put it in my 39 B file.Great info there.Thanks
Dave



[Log in to Reply]  [No Email]
Dick L

08-29-2007 17:29:41




Report to Moderator
 That was Rod (NH) in reply to DaVE 39b, 08-29-2007 15:42:00  
That was Rod(NH) that did the wonderful job on the magneto explanations, illistrations, and pictures. He has done a bunch of work like that on many Allis subjects.



[Log in to Reply]  [No Email]
Dave 39B

08-29-2007 15:35:20




Report to Moderator
 Re: Starting a B in reply to Dave 39B, 08-29-2007 14:51:21  
Dick you might be on to something because I haven't heard the mag click when cranking even when I had the plugs out.I have other mag fired engines and they all make the telltale click.If this is the problem what do I need to do to the mag,a good cleaning or will I need some parts.Thanks again
Dave



[Log in to Reply]  [No Email]
Dick L

08-29-2007 17:38:42




Report to Moderator
 Re: Starting a B in reply to Dave 39B, 08-29-2007 15:35:20  
The impulse drive would have to be disassembled and each part inspected to know if or what parts would be needed. Could even be a broken clock spring. I have repaired the dogs when the corners are rounded off. I bought in the neighbor hood of 20 magnetos at auctions and over Ebay over the years to have cheap parts. You should get a magneto manual if you have never rebuilt one and plan on giving it a try.

[Log in to Reply]  [No Email]
Dick L

08-29-2007 15:21:36




Report to Moderator
 Re: Starting a B in reply to Dave 39B, 08-29-2007 14:51:21  
Try pulling it again. If it starts up in about three feet again my guess would be the impulse dogs are wore or one stuck. When you pull it the mag turns fast enough that the impulse dogs not catch to load up the spring. To crank start they have to catch and tighten the clock spring and when it clicks the spring spins the armature to build electricity for the spark.



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy