"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 - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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