what is the cause of a clicking sound inside valve cover?

Asked by Thomas Aug 20, 2007 at 04:22 AM about the 1987 Jeep Wagoneer

Question type: Maintenance & Repair

There is a clicking sound inside valve cover.  What could be the possible causes?

1 Answer
84,415

littlehorn answered 17 years ago

Probably a sticking or loose rocker arm. You can try a quick fix by adding some Marvel Mystery Oil to the engine at your next oil change, but you may need to remove the valve cover and tighten the rocker arms gradually until you find the one that is sticking. My parents 1992 Jeep Cherokee developed this same problem as it aged, but it has not caused any major issues for them, and we have eliminated it by tightening the rocker arm nuts in the past.

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