Restoring a 1-3/4 HP Monarch - Part 1

Reclaiming its crown


| April/May 2010


According to the tag, this engine, serial number 16690,  was manufactured by the Royal Engine Co. and given the name of Monarch. It should produce 1-3/4 HP at 500 RPM.

This is a “badged” Nelson Bros. engine, a company that is more widely known for its Jumbo line of gasoline/kerosene engines. Little is known about the Nelson Bros. Co., which was established in the early 1900s and went bankrupt in 1940 when all the company assets were sold. It later transpired that all the company records, blueprints, etc., were destroyed by the purchaser of the business in the late 1940s.

There is no register of engine dates for Nelson engines. This one is of later manufacture, identified not just from the serial number, or the fact grease cups were fitted rather than troughs for oil, but also that it was up-rated from 1-1/2 to 1-3/4 HP, which is believed to have started in 1916.

Nelson Bros. background
The Nelson Bros. Co. was based in Saginaw, Mich., and made identical lines of engines, many being sold through its marketing arm – the Royal Engine Co. In all, Nelson Bros. is believed to have sold some 400,000 engines, having, according to the company, reached the figure of 115,000 in 1921.



Engines were sold under a number of trade names, 50 or more, including Bohan, Maynard, Gray, Krackerjack, Macleod and Sattley. For more details and a comprehensive list of trade names, Mark Baier’s article “Nelson Brothers Company History” in the January 1993 issue of Gas Engine Magazine is most informative.

Marks on the Monarch
One can only guess at the date of this engine but it would be before 1923 as after this date they were sold with WICO high-tension ignition. I would estimate 1916 to 1920.














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