B starting problems
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=202956
Printed Date: 25 Sep 2024 at 12:13am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: B starting problems
Posted By: Brinky
Subject: B starting problems
Date Posted: 30 Aug 2024 at 11:02pm
| Some times I pull the starter leaver and she fires straight away, most of the time I I have to turn her over and over again. I’ll drive a couple of hundred yards she’ll cut out then doesn’t like to start. The previous owner fitted new manifold and carb, plugs and leads. He could start it easily with the crank I could never get it started that way. I have tried checking the timing and it seems ok. Any ideas would be appreciated. Thanks |
Replies:
Posted By: Greg (Hillsboro, OH)
Date Posted: 31 Aug 2024 at 7:02am
| Is it a magneto or distributor? 6 volt or 12? |
Posted By: truckerfarmer
Date Posted: 31 Aug 2024 at 7:02am
|
First off, welcome to the forum. My first though is a fuel problem. If your tractor has a sediment bowl on the tank, take the bowl off and check that the screen isn't plugged. Then with the bowl off, open the valve to verify you have a good flow. ------------- Looking at the past to see the future. '53 WD, '53 WD45, WD snap coupler field cultivator, #53 plow,'53 HD5B dozer Duct tape.... Can't fix stupidity. But will muffle the sound of it! |
Posted By: Brinky
Date Posted: 31 Aug 2024 at 7:17am
| It has a magneto, I’ve only fitted a 6v starter with a 12v battery, no other electrics. I recently drained the tank and fitted a new screen in the bowl, and added fresh fuel |
Posted By: steve(ill)
Date Posted: 31 Aug 2024 at 7:36am
|
if you can hand crank start a tractor, and the electric starter is hard to start... it can be the impulse in the magneto. Hand crank starts at ZERO rpm so the motor fires at TDC and easily starts... SPIN the motor, especially with 12v and if the impulse throw out weights do not GRAB, then the motor fires at the FIRE mark or 30 degrees before top dead center.. VERY HARD to start at that point... You may need some work done on the impulse / spring / weights / small springs on the weights inside the Mag front end..
that does not explain why it dies after 200 yards, but is a possible explaination of why it will not start when electric cranking. ------------- Like them all, but love the "B"s. |
Posted By: Steve in NJ
Date Posted: 31 Aug 2024 at 3:01pm
|
Your hard starting with the starter motor is because you're using a 12V Battery. Your spinning the engine way to fast and its overriding the impulse on the Mag. Running 12 volts through a 6V Starter motor isn't a good idea. Cracked nose cones, bent or damaged drives and premature worn ring gears are a result of that practice. Steve@B&B ------------- 39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife |
Posted By: Brinky
Date Posted: 01 Sep 2024 at 2:44am
| Thanks for the advice, I’ll order a 6v battery. What Ah is best ? |
Posted By: Les Kerf
Date Posted: 01 Sep 2024 at 7:47am
|
My Model C doesn't like having the throttle opened very far for starting; it is happiest with the throttle set at the second or third notch. |
Posted By: steve(ill)
Date Posted: 01 Sep 2024 at 8:17am
|
It is correct that a 12v battery spins the starter faster and is probably a little harder on the starter nose and ring gear.. That being said, there are TENS OF THOUSANDS of old tractors now running 12v batteries in them without problems. Many of the "bad ring gears" and such were from WORN OUT 50 year old tractors before the 12v battery was installed. I have 6 tractors with 12v batteries and all run great. YES, they do spin faster and YES, you have to have a GOOD MAG and GOOD IMPULSE to get ANY TRACTOR to start. My main tractor starts in 1-2 revolutions of the engine...has had a 12v battery for 20 years.... starts just as it would when you did a manual crank start... really dont have time to "get up to high rpm" with the 12v starter.
------------- Like them all, but love the "B"s. |
Posted By: dfwallis
Date Posted: 01 Sep 2024 at 11:05am
100AH or so is common. ------------- 1952 CA13092 |
Brinky wrote:Posted By: Brinky
Date Posted: 24 Sep 2024 at 8:06pm
| So I’ve got a 6v battery, bearing in mind I have no other electrics fitted, dynamo etc, should I still have a positive earth or doesn’t it matter? |
Posted By: steve(ill)
Date Posted: 24 Sep 2024 at 8:25pm
|
most 6 volt systems were POSITIVE ground ( earth).... that being said, the starter / mag dont care.... Your amp meter may run backward.. ------------- Like them all, but love the "B"s. |