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

Ford 9N, 2N & 8N Discussion Forum
Order Ford 8N Parts Online

8n problems

Welcome Guest, Log in or Register
Author 
jeepboy

04-24-2007 12:54:22




Report to Moderator

ok i have a mind boggling problem. i have an 8n 6v side mount dist with no spark. ive replaced everything bc its been sitting in the field for about 5 years now. with my tester i have continuity through the ign switch. i also have 6 v from the pos. side of the batt to the pos side of the coil but not the neg. side where i have only 1-2 v. the same goes for the points. when i switch to the neg. side of the batt its just the opposite. 6v at the points and neg. side of the coil and 1-2 on the pos side of the coil. whats wrong??!! its giving me a headache trying to figure it out. any help??

[Log in to Reply]   [No Email]
A. Bohemian

04-24-2007 18:31:53




Report to Moderator
 Try This in reply to jeepboy, 04-24-2007 12:54:22  
I know, you just replaced the points. Nonetheless, if you haven't yet done so, you should check their operation through the following procedure, which takes only a few seconds and doesn't involve disconnecting or connecting anything.

Throw the ignition switch without cranking. You should see approx. 3 amps discharge.

No discharge? There is an open somewhere in the points circuit, likely in the points themselves, or the points are open. And, on an engine of this type, the motor will almost always come to rest with the points closed. Even so, you can crank the motor to make sure.

Normal discharge? Crank the motor. The ammeter should flutter as the points open and the current flow drops to zero, then the points close and the current flow resumes.

No flutter? The points are stuck closed or there is a short somewhere.

See what a useful device the little ammeter is? And yet people hardly ever consult it when the tractor won't run...

[Log in to Reply]  [No Email]
Phil (NJ ,AZ,Sask)

04-24-2007 14:30:08




Report to Moderator
 Re: 8n problems in reply to jeepboy, 04-24-2007 12:54:22  
Jeepboy, When you measure between points in a circuit its necessary to provide information of which Battery post is connected to Ground/Frame and which coil terminal is connected to the wire going to the Distributor?

I can only guess that your +ve battery post is connected to the Frame and that your -ve coil terminal is connected to the Distributor.

If that is correct! the 1-2 voltage reading is bad.. it should be near ZERO. Bad Ground Connection at the Battery/frame

You need to also measure Voltage with the POINTS OPEN.

BTW: I always measure point to point because it
provides MORE accurate information that directly complies with the laws of Physics. It is harder to understand for the novice JMHO

[Log in to Reply]  [No Email]
K.LaRue-VA

04-24-2007 13:04:21




Report to Moderator
 Re: 8n problems in reply to jeepboy, 04-24-2007 12:54:22  
I think you need to measure for voltage from the ignition switch to ground, battery side of the coil to ground, and ignition side of the coil to ground.

Measuring from either terminal on the battery to anything else is just going to confuse you.

I suspect your problem may be a bad ignition switch or that little wire going into the distributor. Sometimes the insulation is bad right where it passes through the body of the distributor.

[Log in to Reply]  [No Email]
souNdguy

04-24-2007 13:02:02




Report to Moderator
 Re: 8n problems in reply to jeepboy, 04-24-2007 12:54:22  
First.. the N was 6v Positive ground. That menas positive side of battery to ground. You can swap.. but make sure the coil is swapped too.

The side mount uses no ressitor.

With points open you should read battery volts at ignition switch and at both posts on the coil, as well as to the feedthru to the points.

With the points closed.. you will read battery volts on the 'switch' side of the coil.. and none after it.

Sounds like you have really coroded / dirty points, and or a partial short at the feedthru bushing on the side of the distribuitor.

clean/reset points, and gap.

Make sure the feed thru conductor is not shorted.

Hot wire with gator clips from battery to input of coil.. see if you have spark.

Soundguy

[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