Turn the engine so no pressure is on the valve. Try to pry the spring up gently. Soak down the valve stem with penetrating oil. Give the valve stem some gentle tapping to cause a slight vibration to get the penetrating oil moving around it good. Do this over a period of days. If no luck you may need to remove the valve to inspect the stem and guide. Most of the time it's just baked on oil that takes up the clearance between the valve stem and guide. If you get it free drain the engine oil and keep it changed on a regular basis.
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Today's Featured Article - Search For Spares - by Anthony West (UK). Following on from the aquisition of the old Fordson F, I was very much in need of spares. As a novice though I didn't appreciate the fact that there were so many Fordson tractors made, that all the other makes seem rare by comparison. As far as I was aware a fordson was a fordson and it was only through trial an
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