Hercules Engine News

Half-Breed Project Update

Hercules screen-cooled engine

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The progress on the 7 HP Hercules screen-cooled engine replica continues, but somewhat slowly. The story today is mostly in pictures, and the first picture shows the newly cast cylinder cover and lid in place on the cylinder (see Photo #1). The coolant pipe is in place, as is the oiler pipe and the oiler. Since the oiler pipe passes through the water jacket, it requires a water-tight joint. The originals had packing around the pipe, but in this case I'm hoping a little silicone on the bottom side will do the trick. The igniter, igniter trip and right-angle priming cup are in place. Mow, where does the I.D. tag belong? Very early E Model engines of this type had the tag on the base, but in this case a spot on the front top of the cylinder cover has been chosen as appropriate.

Photo #2 shows an aluminum pulley that will drive the water pump being turned on the lathe. Photo #3 shows the pulley mounted on the crankshaft spacer and the water pump it will drive. The water pump had to be small to fit between the crankshaft throw and the flywheel, and a small, offset flywheel salvaged from an electric treadmill mechanism proved ideally suited for the pump pulley.

Photo #4 shows the screen cooler connecting cone, which was turned on the lathe from a solid piece of aluminum.

And finally, Photo #5 shows how it was necessary to route the plumbing to allow for a head drain. It had to leave room for accessing the fuel filler spout and for the exhaust pipe and muffler. With luck, next month we may get to see the whole thing assembled and ready to go.

Glenn Karch is a noted authority on Hercules engines. Contact him at: 20601 Old State Rd., Haubstadt, IN 47639, or e-mail at: glenn.karch@gte.net