My Education

Spark

Content Tools

135 Harmon Street, North Tazewell, Virginia 24630

Several years ago, when I was young and innocent, I saw my first hit and miss gasoline engine. It was a marvel to me how the engine would seemingly run at times and coast at other times. Being blessed with better than average mechanical ability, I soon saw that the exhaust valve and the magneto were disabled during the coasting times. I immediately set a goal for myself to own one of this type of engine.

Later I saw an advertisement for a book with the plans to build a hit and miss engine from scratch. I purchased the book, looked at it, studied it, and put it up for another day. That day has never arrived.

Last spring a friend of mine brought to work an auction flyer with a Fairbanks-Morse one and one-half horsepower hit and miss engine listed. He informed me that he planned to attend the auction. I asked him to buy it for me if he could stay within my budget. The following Monday he showed up at work with a truckload of goodies and one engine in very dirty shape.

After studying the engine I saw that it was a Fairbanks-Morse Model Z one and one-half horsepower engine that ran at 500 rpm. The engine had a set of points rigged to work from a post on the timing gear and what I assumed to be a coil.

Later that day, I loaded the engine and hauled it to a steam cleaner for a thorough cleaning. Then I waited for the 'cheap time' to phone my cousin in Washington who is an expert on and a connoisseur of antique engines. I proudly informed him of my acquisition and he broke the news to me that it was not a hit and miss engine but a throttle governed engine. He told me that he would send me copies of Gas Engine Magazine advertisements so I could order reprints of manuals.

Between this time and the time my manuals arrived, my friend and I looked through his other boxes to decide what was of value and what was fit for the scrap iron yard. We kept a magneto that looked interesting and a used head gasket. We scrapped the funny looking motor scooter fender.

The U.S. mail finally delivered the manuals. That evening I spent a few hours studying and restudying them. Then I found that the engine ran on the spark supplied by a magneto. The same magneto that we had stored in case of a future need. The engine also had a crankshaft guard that was the duplicate of the 'fender' I scrapped. Woe and misery upon me.

On further inspection I found that at some time in the life of this engine someone had broken the connecting rod and repaired it in a blacksmith shop. The connecting rod journal was measured and found to be 0.011 of an inch out of round. The magneto trip pin and roller on the timing gear would have to be renewed and the governor spring adjusting screw was missing. The engine was missing the hold-down clamp for the magneto. The oak skids would need replacing, and a new fuel tank would need fabricating. The magneto was inspected and found to have no spark. The butterfly in the carburetor was worn, and a new one was made from a scrap door kick plate. I also found, to my dismay, a crack in the head that would need the attention of a professional welder.

Getting a spark from my magneto was an initial concern, and no one in my area could help with the repairs. An advertiser in Hemmings Motor News told me that Mr. John Rex in Massachusetts could do the repairs. So 1 contacted Mr. Rex and talked to him for several minutes. He seemed to be very knowledgeable. Mr. Rex told me that I should not be concerned about the connecting rod journal and that he could repair the magneto. Mr. Rex was good to his word and returned my magneto, in a couple of months, with a very hot spark.

I was still concerned about the connecting rod journal. I took the crankshaft to a local automotive machine shop. The man at the shop wanted to know the original size. I told him that it did not matter because bearings would have to be made especially for the engine. I don't think he wanted to do the job because no meeting of the minds occurred. Upon returning to my shop, I used a micrometer, a milling machine (a flat smooth file), and various grits of sandpaper to remove the excess metal from the journal. The journal is now smooth and round to within 0.001 of an inch.

New rings, bearings, gaskets, and a replacement rod were ordered from our friends at Hit and Miss Enterprises. However, Hit and Miss could not help me with a replacement for the 'motor scooter fender,' but the machinist did inform me that the connecting journal was undersized by 0.250 of an inch.

Several parts had to be custom made to finish my restoration. Using a photograph I found on the Internet, I made a pattern and cast a new magneto hold-down clamp. A new ratchet pawl was made for the starter crank handle. A new fuel tank was fabricated from galvanized sheet metal and two old paint thinner cans. Finally, using blacksmith tools, a new crank guard was forged from sheet steel. The compound radii were so time consuming that it made the 'scooter fender' worth about $300.

The engine was covered with a fresh coat of green paint and reassembled. I then mounted the wooden engine skid on a shop-made cart assembled from scrap iron and pipe. It gave me great pleasure at lighting off time for the engine to start and run smoothly the first time.

My advice to anyone who has the bug to own or restore any piece of antique machinery is to educate yourself. Subscribe to Gas Engine Magazine, read books, and talk to owners before buying or starting any project.