On the automatic advance. About 90 percent of them old distributors need attention in that department. Worn out weights, pins they pivot on, weak or broken springs or rusted parts. You need to put a timing light on to check the actual advance and retard. Like I said , it should be at tdc at low idle ideally and gradually advance with increasing engine speed. You need some reference marks on pulley to see what it is doing. On an M, 2 inches on pulley is equivelent to about 30 degrees. There fore, it should be in that vicinity at full throttle and be steady, not changing back and forth. And again, there are several different shafts in these distributors with different advance amounts. I's betting your's is probably advancing several degrees at low idle there fore causing rough idle. So many variations over the years in these old tractors, gas heads, kerosene heads etc, different domed or flat pistons and if you don't have the combination right you have problems. On my own M that I am ressurecting from the long dead, it had a 22 degree shaft which is for fire crater pistons, but it has flat head pistons so I modified the advance and will have to calibrate it when I get it running. I made marks on pulley to reference different degrees. To do so you take pulley diameter times 3.l4159, divide that by 360 and multiply that by the degrees you want to make your mark. This gives you a measurment in inches on circumference of pulley to make your mark. Never had math after 8th grade but as a mechanic you use it every day.
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 - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
... [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.
