Leaking valve cover gaskets are a not uncommon to see on older Mazda Miatas. The rubber that a valve cover gasket is made of will turn hard and brittle if left unserviced for a long period of time. Leaking valve cover gaskets can cause problems.
The valve cover gasket on the NA and NB Miatas not only seals the outer edge of the valve cover, but also seals the spark plug galleys where the sparks plugs and ignition wires live.
Motor oil and ignition wires don’t mix. The motor oil causes the ignition wire boots to swell and self destruct. This condition can ignition misfires and noticeable performance drops. When I see a leaking valve cover gasket I immediately inspect the spark plug galleys for any motor oil intrusion.
I have replaced many Mazda Miata valve cover gaskets and I have found that even with the upmost care that a new valve cover gaskets can leak soon after its installation. New valve cover gaskets don’t leak badly, but any leaking really drives me crazy. It must be some of my German heritage sneaking through.
When installing a new valve cover gasket, I like to get all parts and sufaces as clean as possible before reassembly. I also like to break the surface tension of the cylinder head by sanding the cylinder head surface with an abrasive emory cloth. I also use a light coat of air craft sealant on both mating surfaces.
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Just Miata is Florida’s number one Mazda Miata service and repair facility for oil changes, service, repairs, timing belt replacements, water pump replacements, and convertible top replacements. Just Miata has the most knowledge and provides the best service and repairs and convertible tops for the Mazda Miata MX-5. Just Miata is the only Mazda Miata MX-5 specialist in florida.
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Just Miata is a Mazda Miata MX-5 service, repair and convertible top replacement shop for the greater Tampa Bay area, including St. Petersburg, Clearwater, Tampa, Bradenton, Sarasota, plus Orlando, Lakeland, Fort Meyers, Port Charlotte, Venice, and the surrounding counties of Pinellas, Hillsborough, Manatee, Pasco, Sarasota, Lee, Charlotte, Orange, Lake and Polk.