Hello,
You will need to remove the valve cover to do it here is a guide and diagrams below on how to do the job:
https://www.2carpros.com/articles/replace-valve-cover-gasket
Check out the diagrams (below). Please let us know if you need anything else to get the problem fixed.
Cheers, Ken
Images (Click to enlarge)
Jun 22, 2018 at 4:48 AM