WARNING: This page is about a different car, the 2023 BMW X5, 2022 BMW X5, 2021 BMW X5, 2020 BMW X5, and 2019 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The figure shows the rear of the engine.
Pull out and remove exhaust camshaft adjuster (1) from the timing chain (2).