Posted by Texasmark1 on May 29, 2015 at 19:49:04 from (184.63.170.149):
In Reply to: Coil questions posted by Freewheelin' on May 29, 2015 at 18:48:51:
My MF 35 service manual says that points are designed to break 5 amps. Considering you are cranking, 12v/5 amps = 2.4 ohms total resistance from the voltage source through the ignition switch, starter switch, ignition coil primary circuit, ballast resistor, points, and distributor to the tractor frame where the battery (-) for negative ground systems is located. Less resistance and you burn up the points over time prematurely. More resistance and you don't have enough energy stored in the coil when the points break to fire the plug properly for combustion.
Voltage is just a mechanism to force the current through the circuit just like water pressure is the mechanism to force water through your water pipes. The resistor is just an orfice of sorts to regulate the flow.
Upload one or more videos to your post. Photo filesizes should be less than 300K and Videos, less than 2MB. 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 - Oliver 550 Clutch Overhaul Tips - by Greg Sheppard. I got my 1964 Oliver Model 550 (serial 141-139-519) second-hand and used it for several years before the clutch began to slip. After taking up the pedal linkage several times I saw it was going to take more than that. The engine had been leaking oil at the rear seal and I suspected
... [Read Article]
Latest Ad:
For sale Farmall super A tractor is complete and has just been setting for awhile,it was running when pulled out of the barn,shouldn’t take to much to get it going asking 1100.00
[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.
