Avery Tractor Offered Triple Play of Engine Options

In 1919, three years before the Avery Power Machinery Co. went bankrupt, a brochure discussed the company's engines.

| March 2007

  • MarvStochl.jpg
    Marv Stochl’s 1913 Avery 40-80 tractor, hooked to a thresher.
    Photo courtesy of Marv Stochl

  • MarvStochl.jpg

In 1919, three years before the Avery Power Machinery Co. went bankrupt, a brochure discussed the company's engines. "The motor on the Avery tractors is of the valve-in-the-head type. Motors are built in three types: the T-head, the L-head and the valve-in-head. In the T-head motor (like Marv Stochl's 40-80 Avery), the valves are located on either side, with the result that the combustion chamber has two pockets, one on each side.

"In an L-head motor, the valves are arranged on one side, with one pocket or valve chamber. In the valve-in-head type, the valves are located directly above the cylinders. There are no side pockets or valve chambers."

Another feature of the Avery engine was its removable cylinder heads. "By removing the nuts from the stud bolts passing through the cylinder head, the head can be slipped off and the valves are so exposed that they can be readily ground."

The renewable inner cylinder wall was another feature far ahead of its time. The inner cylinder wall was cast separately from the main cylinder, which, according to the company, gave it several advantages:



"First, if you have any trouble, such as scoring from lack of lubrication or from any other cause, you can easily and quickly take out the inner cylinder wall and replace it with a new one at a very small cost. With the other tractor motors, should you have trouble of this kind, there is just one of two things to do - either take out the motor, crate it up and ship it back to the factory or to a machine shop and get it rebored, reground and have an oversized piston turned up and fitted for it, or throw it to one side and get a complete new cylinder.

"Either of these methods is a very expensive proposition, both in the amount of money it costs and in the amount of time you are without the use of your tractor, which might seriously delay your work.



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