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
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Friday, June 22nd, 2018 AT 11:48 AM