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Hit & Miss Gas Engine Discussion

O&S Cam Stopper Engine Questions

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Old 08-14-2019, 09:19:25 PM
Martin Reed Martin Reed is offline
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Default O&S Cam Stopper Engine Questions

Hello all,

I am renovating a 6hp O&S horizontal hopper cooled engine for a gentleman and have a few questions. The can stopper mechanism is very similar (almost exact) to a Columbus and I had a question about the pawls that engage and disengage the from the cam. There are two pawl(photo 2929, one showing) that lock in a housing that operates both valves and the igniter when running. On this engine there is a small stud underneath each pawl as shown in photo 2930. I believe the stud should have a tiny spring behind it to continually force the pawl outward. Am I correct? I have had this type of mechanism apart before but I now forget whether the pawls are spring loaded.
Again the Columbus works the same way. In fact I assume the O&S company copied or had some for of license to manufacture the mechanism.
O&S (Orr and Sembower) mainly made steam engines and boilers. They also had a line of vertical and horizontal engines with the horizontals being cam stoppers. Currently I know of only one other horizontal, another 6hp horizontal engine.
This particular engine appears to be a kerosene burner which is unique. It has the air preheat chamber between the head and muffler and also a provision for admitting water into the carburetor. I suspect not many of this arrangement was made. The other known 6hp is a straight gasoline burner.
I would very much like to converse with any other owners of O&S engines. The final photo is of the engine in its present state of repair.

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