1919 Eaton Restoration – Part 2 of 3

Making governor weights, a latch arm and muffler for the Eaton from scratch.

| April/May 2017

This is Part 2 of Peter Rooke’s series on restoring a 1919 T. Eaton Co. engine. Start at the beginning with Part 1.

Governor weight

The governor weights were missing from the Eaton, as well as the latch arm that locked the pushrod and thus held the exhaust open. Fortunately, several photographs were found, including some very useful ones on eBay where the vendor had helpfully laid a ruler alongside the weight. There was only one weight for sale and the shipping costs and duty alone would have added another $35 to the price, so the photographs were a great asset in making the weights.

A single long piece of 1-inch-diameter steel rod was used to fabricate the two weights, making it easier to hold the work in the lathe chuck and vice. First, the 0.25-inch holes were drilled at the end of each weight for the springs, spaced 2.75 inches apart. Allowance was made between each of the two weights for parting off and the holes for each weight were drilled at 90 degrees to each other.

The steel rod was then machined on the mill, cutting rectangular 0.25- by 0.50-inch profiles at each end of a weight before transferring it to the lathe.

Using a ball turning tool set to a radius of 2.5 inches, the bodies of the weights were shaped. It was not possible to shape right up to the rectangular sections at each end in view of their different orientation. The cutter was stopped short and the radius later finished with a file.

To complete the weight body, the recess for the flywheel hub was filed, along with a flat where the arm would be welded. To mark the center line and the depth to file to, a hacksaw was first used to cut a shallow slot.


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