I pulled the head yesterday, used a lead hammer to "perswade" the valve to close and then to drive it out after removing the spring. There was just some corrosion on the valve stem. I wire brushed the stem, used an engine oil passage cleaner brush and WD 40 on the valve guide and got it so that the valve moved freely. I reassembled the head and rotated the engine by hand and the valve moved freely. I need to drain the oil, which appears to be full of coolant, put in new oil and coolant and finish bolting on the gas tank before trying to start it.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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