Jun/Jul 2008

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Hercules Engine News

Model S Changes

By Glenn Karch

Near the end of production of the Model S Hercules gas engines in 1929, several changes were made to the basic engine block and its mechanical features. The pictures shown here are of a 1-3/4 HP Model S Hercules engine with a June 1, 1929, casting date on the block and serial number 374563 on the tag. This engine was purchased in the fall of 1929 by my grandfather, Jacob Karch, through his son-in-law (my uncle), Harold Miller, who was employed at the time by Servel, Inc., the parent company of Hercules Products.

At that time, only one 3-1/4-inch bore style of block was being cast, all Hercules, Jaeger and ARCO engines of that size using the same block casting. Model S Economy engines were no longer being produced, as Sears had opted to sell the newer style Model XK Economy engines through their catalogs starting in 1928.

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