Usually the camshaft oil seal is replaced during engine repairs and when oil leaks
Leaking oil splashes onto the timing belt, which eventually deteriorates.
Execution:
Using a 10mm wrench, unscrew the three bolts securing the timing cover
Remove the front timing drive cover.
Insert a 10mm head with an extension through the hole in the pulley and put it on the nut securing the rear timing belt cover.
Using a 17mm socket, loosen the bolt securing the camshaft timing pulley.
Remove the timing belt (see the article “Checking and replacing the timing belt")
After unscrewing the fastening bolt, remove the camshaft pulley
Use a screwdriver to pry off the oil seal
Remove the camshaft oil seal
Apply a thin layer of engine oil to the working edge of the new oil seal and press the oil seal using a mandrel of suitable diameter
The subsequent assembly is carried out in the reverse order.