Posted by Tom in TN on July 24, 2013 at 12:15:25 from (22.214.171.124):
I am working on a Gravely walk-behind tractor/mower for a friend of mine. It is the old "L" style tractor that was new in about 1964 or 1965.
The exhaust valve is binding badly. It will come up when I turn the engine over, but will not go back down. If I rotate the engine so that the intake valve is open, I can tap the exhaust valve back down, but it takes a pretty good tap using a piece of 2 X 4 lumber and a mallet.
I have soaked the valve stem for about four days using PB Blaster. I can turn the valve using a pair of pliers, but it turns really hard.
I've turned the engine over and tapped the valve back down into the engine about 20 times and it is still really stuck.
The mower sat outside in the rain. One of the head bolts has been twisted off and there was definite signs of rust inside the head and on the exhaust valve.
Any ideas short of pulling the cylinder and removing the valve from the block?
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