Seal Ring - Camshaft, Replace
Remove, Disconnect
Remove camshaft timing gear - see "Removing and installing camshaft timing gears".
Remove camshaft seal (1) with a suitable tool, making sure not to damage sealing surfaces.
Clean
Clean sealing surfaces and remove sealant remnants.
Install, Connect
Slightly lubricate seal ring lip (with) white silicon grease.
Use KM-422 (2) to press seal ring into camshaft bearing cover - use camshaft timing gear screw and disc.
Install camshaft pulley - see operation "Camshaft Pulleys, Remove and Install".
Remove, Disconnect 
Clean 
Install, Connect 