Replacement
1. Disconnect the negative battery cable.
2. Put the car on the handbrake.
3. Set piston N1 to TDC.
4. Unscrew the camshaft sprocket bolt, remove the sprocket.
5. Remove the seal using a small screwdriver.
Installation
1. Lubricate the new seal with engine oil and install.
2. Install remaining parts and check engine operation.