CAS and Valve cover gasket - Miata Forumz - Mazda Miata Chat Forums
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NA (1989-1997) NA Miata discussion within. The MX5's first generation, the NA, sold over 400,000 units from 1989 to 1997.

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Old 05-09-2014, 10:51 AM   #1  
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Default CAS and Valve cover gasket

Upon doing my oil change I noticed what looked to be a little seepage from what I later determined to be the CAS. After a brief bit of research it looks as if this is a pretty simple fix, nonetheless I figured I would gather any input from some of you fine folks before tackling it. Can anybody recommend any tips or tricks?
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Old 05-09-2014, 01:46 PM   #2  
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The o-ring leaking is common. Mark its orientation with regard to its timing slot or you will need to orient it with a timing light. Ensure it isn't also leaking internally as this is a precursor to failure.
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Old 05-09-2014, 07:50 PM   #3  
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This might be a stupid question but How would I determine whether or not it is leaking internally?
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Old 05-11-2014, 08:19 AM   #4  
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Quote:
Originally Posted by Calane53 View Post
This might be a stupid question but How would I determine whether or not it is leaking internally?
It would be leaking oil out through the electrical plug-in or at any of the seams or joints in the body of it. It usually doesn't come out very much before the unit fails and is hard to tell if the outside o-ring is already making everything wet. The good news is it is easy to change if it ever fails. I am just a big proponent of inspecting things when I have them apart.
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Old 06-04-2014, 11:00 PM   #5  
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I just did this job on my '95. Six shooter is right on the marking. I used a paint stick. Rotating the CAS is how you adjust the timing, so to avoid that, before you remove or rotate the CAS mark it's position. When you put it back in just like up your marks. When you remove the CAS note the orientation of the inside of it. It fits into a slot in the camshaft and can be a problem to align properly. If the cam cover is off, you can rotate the engine until you see the notch in the camshaft. That makes the job a bit easier. A little oil on the new O-ring will make it easier to put the CAS back together. Good luck.
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Old 06-05-2014, 03:36 PM   #6  
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^Yep, what he said.
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