The marks on the camshafts 1 and 1 are aligned with the dark links on the timing chain.
The mark on the No.2 camshaft is aligned with the dark link on the timing chain.
3. Align the mark on the crankshaft gear with the dark link on the timing chain.
4. Install the lock of the upper camshaft.
5. Tighten the screw fixing the camshaft lock to complete the operation.