Right o-ring
1. Remove the camshaft pulley.
2. Remove the O-ring using the special tool. Alternatively, drill two small holes in the end of the o-ring, screw in two self-tapping screws, and use pliers behind the screw heads to pull the o-ring out of its socket.
3. Clean the O-ring seat and sealing surface of the camshaft.
4. Lubricate the new O-ring with clean engine oil and install it on the camshaft.
5. Press the O-ring into the seat using an M10 bolt with a suitable washer.
6. Install the camshaft pulley.
Left camshaft seal
An O-ring is used as the left camshaft seal. The sealing ring can be replaced after unscrewing the bolt from the plate from the cylinder head.