"Can the rings be checked without pulling the piston?"
If you've got a good ear and an airhose, you can try, one cylinder at a time. Hook whatever you're using to put air into the cylinders up. Best is a hose from a compressor with the tank pressure up and the power off. Set your regulator at 100# or so and put the air in and listen. Turn the motor one cylinder at a time and test the one where both valves appear to be closed. (If the rocker is off, they should all be closed, if not, closed vlaves are indicated by a gap between the rocker face and valve stem). If you get a sound of escaping air from the exhaust pipe on top of the manifold, there's an exhaust valve stuck open on that cylinder. If you have air leaking back out through the carb (it helps to remove the hose between the air cleaner and carb, it's an intake valve stuck. You might have to drop the pan to hear it, but if the sound seems to be coming from the bottom of the motor, you can suspect your rings. If you've still got a lot of oil in your cylinders, you may hear a drip in the pan instead of an air leak, as the oil is forced out. If it bubbles or hisses out through your radiator, think head gasket.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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