Hi and welcome to JA
Do do this task requires special tools and the transmission removed for access.
I hope i have answered your question please let me know if you require further assistance.
See instructions below
NOTE: Camshaft gear bolt (13) and friction washer (14) MUST only be used once.
NOTE: Camshaft bearing cap bolts MUST only be used once.
Tighten camshaft compensation gear bolt. Tightening torque: 20 Nm + 90° (16) .