A the university I looked back into books I had when I was in mechanics school. Answer! We are learning: The drive spring is the only force driver involved in the link between the pinion and the armature shaft. It does get smaller in diameter as a result of taking shock loading of the pinion teeth in the ring gear. You are correct.
The weak spring assures that the pinion stays out of engagement when the cranking stops (due to either the engine overspeeding the pinion pushing it back on the spiral sleeve, or the starter motor shuts off with no starting of the engine. The sleeve is designed with either groove limits, or a stop (like yours)that force the pinion to turn with the sleeve when it reaches this limit. THe forces are contained to the sleeve.
There are several designs of this type of system, and applied to many different engines. I Learned also the new style has a shock absorber internal to it, and does not use the big spring. It is more reliable because of the reduces number of parts, and the more solid positioning of the drive pinion to the ring teeth.
If you purchase a used starter with good armature, and a new style drive, it should be magnificent. A 1970 motor service -Automotive Encyclopedia- provided the context in which it was made clear (along with your good photos.) Thanks for the enriching discussion. Jim
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 - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[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.
