Re: "It ran well when I parked it!"
Squirt some MMO or other penetrating lube in at the top as described above and leave it alone. You might have to add more lube but once should do it. One morning, you'll come out to the garage and see the valve has returned to its proper position. Patience is a virtue here and tearing into pulling it apart will probably prove to be a waste of time.
I've never used MMO - too expensive at $110 for a US gallon. That's only 3.8 litres.
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