Posted by Texasmark on May 02, 2023 at 07:25:35 from (147.160.221.188):
In Reply to: Re: Oliver 1850 posted by showcrop on May 01, 2023 at 04:08:01:
Been 18 years since I retired but here goes:
Permeability of the coil's core is temperature sensitive and decreases with temperature meaning that the inductance, hence amount of energy it can store to dump into the spark plugs, diminishes. Allowing the coil to cool temporarily shrinks the conductors, opening the short and reverses the loss. I never have researched the exact mechanism within the coil that produces the heat that wasn't produced when it was new. Possibly shorted turns (insulating varnish encircling the wires which has worn off due to operational effects might be the answer since heat makes copper expand and when it cools it shrinks back and opens the short.
The coil has a volt per turn value based on the design/circuit parameters. If one turn does not produce it's required voltage the coil essentially pumps all its energy, dissipating heat, heating the core, into that turn to bring it up to the required value and that could be the reason the coil fails when it gets hot.
The condenser (capacitor) is made up of layers of conductor and insulator and probably aluminum foil and oil soaked paper or plastic. My experience with these components is that once they short they shorted and its not recoverable due to the nature of the material that is burnt during the short that remains in place.
I too have had coils fail as yours probably has on some of my gasoline engines over the years.
Upload one or more videos to your post. Photo and video filesizes should be less than 5MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
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 ]
Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
... [Read Article]
Latest Ad:
Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
[More Ads]
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.
