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

Shop Now

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

Discussion Forum
:

Farmall A erratic running

Welcome Guest, Log in or Register
Author 
csmeyers

09-26-2007 17:46:43




Report to Moderator

My A starts right up and runs smooth, however when put the tractor under a load or fast throttle advancement it will run very rough. It sounds like it is not running on all 4 and I do notice dark smoke from the exhaust stack, when I pull back the throttle it will run smother. I just went through some Mag resetting, but I don’t think that is it....or may be it is. I need some of you Farmall experts to give me some suggestions. Also what should the original Generator put out, I know a car alternator will put out about 14 volts, will a 6 volt generator put out 8 volts. My amp meter is not working, but I can see the contacts closing on the regulator so I am some what sure the generator is working.

[Log in to Reply]   [No Email]
Loren P

09-27-2007 08:07:16




Report to Moderator
 Re: Farmall A erratic running in reply to csmeyers, 09-26-2007 17:46:43  
I fought a similar problem for a long time on my 1939 A. The problem turned out to be a restriction in the intake manifold. I bought it with a stuck engine, and put new sleeves & pistons in and completely rebuilt the motor, but it always seemed to run bad under load, like it was missing on a cylinder. It would start on two cranks and idle great, but when advancing the throttle, it would 'putt-putt' like a 2 cyl. John Deere. Switched carb and mag with my nice running B, made no difference. Checked timing, valve clearnace, etc. many times; still ran bad.

This spring I took the carb off to clean it when it flooded, and I put my finger in the intake to see if it was wet from gas. That's when I noticed the passages felt restricted. I took the manifold off and found that were the passages branch out above the carb were restricted down to about 3/8" or 1/2" hole, and they should be about 1". I couldn't get the stuff out of the manifold, even by sandblasting. It almost looked like casting slag. I bought a new manifold for $100 on eBay, and the tractor runs great now.

[Log in to Reply]  [No Email]
csmeyers

09-27-2007 18:19:55




Report to Moderator
 Re: Farmall A erratic running in reply to Loren P, 09-27-2007 08:07:16  
I never thought of checking the manifold. Today when it sputtered and spit I just held the throttle and kept running, there was a lot of black smoke and eventually she cleared right up. I am starting to think that there is some carbon build up, I am pretty sure that this engine has never be worked on. I will check out the Manifold.

Thanx,

Corey



[Log in to Reply]  [No Email]
John T

09-26-2007 18:23:15




Report to Moderator
 Re: Farmall A erratic running in reply to csmeyers, 09-26-2007 17:46:43  
Its NOT the open unloaded output of a genny that counts its what it can maintain when coupled to a load like a battery. If shes charging, the battery voltage should raise from 6.3 volts (just sitting there not running) to 6.5 to around 7 volts at fast running RPM. Similar the lights would glow noticeably brighter from slow idle to fast RPM if shes charging cuz the battery voltage rises. Put your voltmeter on the battery n measure it sitting there then running at fast RPM to see if shes charging. It have a working ammeter?? if so it should show if she's charging or not. If no charge make sure the belt is tight n try n dead ground the gennys Field post to see if she charges then?? If so but NOT otherwise its a wiring or a VR problem or the VR isnt grounded(if a VR) or a light switch problem (if a 2 wire cutout relay system) or the wiring up to the switch or the switch is bad or not grounded.

Not sure if the erattic running is fuel or ignition but Id check the points n the gap n replace if badly burned or pitted but if good n only gray oxide coated try to clean/buff/polish them n try it. Clean n inspect the cap n rotor n look for hairline cracks or carbon traces or moisture. If the plugs are oiled or carboned up or burned REPLACE THEM n try it....

Have fresh clean water free gas???

John T

[Log in to Reply]  [No Email]
csmeyers

09-26-2007 18:25:19




Report to Moderator
 Re: Farmall A erratic running in reply to John T, 09-26-2007 18:23:15  
Clean Gas, new cap and rotor, and some what new wires and plugs. I did have to clean the points, perhaps the gap is to wide. Would timing cause this problem?

when I put a meter on the batt it displays 6.5 volts, and as I said earlier I can visually see the VR closing and opening with the engine RPM's. I just ordered a new gauge, thanks any way.

corey



[Log in to Reply]  [No Email]
John T

09-27-2007 05:36:54




Report to Moderator
 Re: Farmall A erratic running in reply to csmeyers, 09-26-2007 18:25:19  
If you removed the wires from the ammeter and place an ohm meter across its leads, it should be almost a short circuit UNLESS its open n bad and then no charging current could pass through it like Jim was talking about. Also, if you put your volt meter on the battery and short by pass the meter like he suggested and the batetry voltage then rises, sounds like an open bad meter is the problem ASSUMING ITS WIRED CORRECT. Id also insure theres a good wire from the BAT terminal on the VR or Cutout Relay up to the load (NOT battery/starter) side of the ammeter cuz thats the charging current path otherwise it cant charge n raise the batterys voltage. Theres usually onky ONE wire on teh ammeters Supply side that leads to the battery/starter while its other Load side is what wires down to BAT on the VR plus supplies hot battery voltage (if ammeter is good and continuous) to loads like lights n ignition.

If the VR's Cutout relay is closing that tells me its producing higher then battery voltage so if you can get a continuous current path from the genny to n thru the relay and actualy up to the battery via the ammeter it should raise battery voltage ?????

Although you say you see the relay is closing... Are you sure its the Cutout Relay instead of the Field current control relay????? ????? ???? if the genny was okay but the cutout relay wasnt closing you can try to by pass short jump around it by temporarily wiring the VR's BAT and GEN/ARM terminals togetehr n see if she charges then????? ? if that makes it charge (ammeter would have to be okay) then its the Cutout relay thats the problem instead of the ammeter or other things.

TEST THE AMMETER TO BE SURE ITS NOT OPEN,,,,, ,BE SURE ITS WIRED CORRECT,,,,, ,TRY TO DEAD GROUND THE GENNYS FIELD TO SEE IF SHE CHARGES,,,,, ,,TRY TO BY PASS JUMP THE CUTOUT RELAY AS DESCRIBED ABOVE IN CASE ITS THE PROBLEM

If you need my long winded Troubleshooting Procedure to diagnose non charging problem search the archives or post back

John T

[Log in to Reply]  [No Email]
Janicholson

09-26-2007 18:59:48




Report to Moderator
 Re: Farmall A erratic running in reply to csmeyers, 09-26-2007 18:25:19  
A burned out amp gauge will do that. Mag points .013" try jumping across the old amp gauge with a piece of # 10 solid wire. (this just replaces the internal parts that might be "open". JimN



[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