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Timing chain or belt? Almost all timing gears have a dot that face each other when the timing marks are lined up. If you are not carful you can damage the valves while rotating the crank and came to the lined up position. However in a perfect world the top gear can be removed when it is lined up, and reinstalled with the chain or belt in place, it will be tight but you should not need to force it. good luck
No engine used in the Expedition has a timing belt, they all have timing chains, timing chains never have to be replaced unless they fail or the engine is being rebuilt. On this engine replacing the timing chains for each of the two camshafts (2) cost about $500.00