Welcome to 2CarPros.
If the starter is working properly but only spinning and not engaging with the flywheel, remove the starter and confirm the flywheel is positioned correctly, there are no teeth broken from it, and it is tight. I have to be honest, usually there is at least a grinding sound. Are you certain that the engine isn't turning really fast due to a broken timing belt? Make sure when you engage the starter that the drive belts (alt, AC.) Aren't turning.
Do me a favor. Record the sound made by the starter and upload it so I can hear what is happening. I should be able to tell you what is happening.
Let me know.
Joe
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Saturday, June 15th, 2019 AT 7:21 PM