Hi,
To determine the top dead center, you need access to the crankshaft timing gear behind the timing cover.
There is a mark on the gear that aligns with a mark on the rear timing belt cover. Take a look at the picture below.
Let me know if that helps. Also, if you have other questions, let me know.
Take care,
Joe
See pic below.
Sep 15, 2023 at 2:25 PM