I was looking over old posts today and noticed your reply. First off, low ash oil is good, I like it but not the only reason for valve burning. In 1969 I went to Hickory Hills training school near Chicago for a week. One subject was gasoline engine reliability. At that time IH had not yet introduced low ash oil. That came a few years later. They also introduced a improvement package which included new sleeves & pistons, valves , valve seals and a new distributor along with improved gaskets. All of these along with low ash oil helped a lot. The 656 was not equipped with stellite valves but I did put them in a lot of them when doing valve jobs. Another things, once your torch a valve, you will often find the valve seat is no longer tight in the head and then you need to install oversize seats. The valve head gets rid of most of it's heat to the valve seat so if it is loose the valve runs too hot. Now as far as the 666, one thing they did was to increase the cubic inches of engine but stay with a smaller venture in the carburetor thus limiting the horse power some what. This reduces the available air to engine so therefore it also reduces the heat and pressure in the cyl. That engine lived much better due to these changes. You could easily get another 10 horsepower out of that C-291 in the 666 but running with extra cubic inches and lower horsepower it just plain made for better engine life. Note, my spell check keeps screwing up my spelling on the carb venture.
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 - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
... [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.