If this is a late 70's single cylinder Tecumseh OHV, they had an overheating problem by design. Craftsman, Bolens, and probably other OEMs used this engine thinking that it would be a great new technology for small engines. But it was put into the marketplace before it was perfected. At that time I had gone to Tecumseh tec school and was a certified tec. We were seeing a lot of these engines failing from overheating at about 200 hours, and the factory would not stand behind the customer, the OEM, or the shop.
The problem.... The valve box sat on top of the aluminum head's cooling fins. Of course the rocker arms and push rods needed to be oiled, and so they were. But the heat of the head transferred up into the base of the steel valve box and the rubber O rings on the attachment (head) bolts could not take the heat and so cracked and failed. Now the oil was leaking down onto the head's cooling fins and forming hard crispy chunks that continued to grow from more oil escaping and baking until the cooling fins below the box were totally blocked. The heat would now warp the head, dropping the steel valve seats and destroying it.
In later series OHV engines, they found a better quality O ring that could stand the heat, and so the problem was solved. The cast iron cylinder and crankcase and lower end parts were plenty substansial, commonly giving an engine life of about 1500 hours.
Of course, mouse nests mean big trouble for these engines and all air cooled engines as well.
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 - Threshin Demonstration - by Michael Delaney. Introduction I bring you greetings from Prince Edward Island, Canada. We are Canada�s smallest province but big on farming. Maybe you�ve heard of us. Potatoes are our biggest crop. However, there is lots of mixed farming here also. I have a small mixed farm with 25-30 cattle. I make very good use of old machinery. I have a 135 MF Diesel, Farmall H and 1/3 share in an Allis B. I have complete lines of tillage and harvest equipment, and a saw gear etc. I have everything one would
... [Read Article]
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.
