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Old 01-02-2010, 08:34 AM   #1
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Default valve cover gasket leak

So the past few weeks my car started leaving a couple drops of oil on the floor overnight. Scared shitless I finally started looking around the engine bay for leaks and looks like I found it:

The valve cover rubber seal is leaking towards the back of the engine. Now this is not just a teeny spot: it looks like the whole back side of the seal is covered in oil and very very slowly it runs down the back of the motor and onto the ground.


I put in a BRAND new one when I put the valve cover back on when rebuilding my engine. Now the questions:

1) What could cause this brand new seal to leak?
2) What can I do to prevent this from happening once I replace it? (again)

I did make sure to put drops of engine sealant in the proper places as per instructions on m.net btw.

Anyone?
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Old 01-02-2010, 08:41 AM   #2
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Bad gasket..? Did you buy the ~$3 el-cheapo advance auto gasket by chance? I did on my '92 once and replaced it a few weeks later when I had a similar leak, no problems thereafter.
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Old 01-02-2010, 08:43 AM   #3
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LOL yes I did. Which one did you replace yours with? The OEM one from Mazda?
And did you do the silicone/sealant thing or no?

Its funny you say that cause this is EXACTLY what happened to me too: it was fine for a few weeks, probably about a month or 2 now. And then all of a sudden: leak.
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Old 01-02-2010, 08:47 AM   #4
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LOL yes I did. Which one did you replace yours with? The OEM one from Mazda?
And did you do the silicone/sealant thing or no?
I actually replced it with another el-cheapo gasket, the same exact one, lol. I was working at advance at the time so I figured why not since I was swapping them out for free anyway, guess it comes down to luck of the draw. I actually didn't use the sealant on a few of the miata valve cover gaskets I've replaced (had 3 so I've replaced my share, only time I ever had a leak was the time I mentioned and I actually did use the sealant that time.)
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Old 01-02-2010, 09:32 AM   #5
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The DFW crew always puts RTV around the gasket on both sides and then it won't leak. We're the ****.
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Old 01-02-2010, 11:07 AM   #6
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There's a $3 valve cover gasket?!?!?!

I think I gave $70 for mine from NAPA. **** me runnin.
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Old 01-02-2010, 11:19 AM   #7
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There's a $3 valve cover gasket?!?!?!

I think I gave $70 for mine from NAPA. **** me runnin.
~$20 now, I think they were like $12 back then..something like that, 3 was a bit of an exaggeration.

Valve Cover Gasket by Felpro - Part VS50569R - Advance Auto Parts
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Old 01-02-2010, 01:16 PM   #8
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I always use silicone on the corners of my valve cover.
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Old 01-02-2010, 03:39 PM   #9
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Don't pinch the gasket when you install it - press STRAIGHT down into the RTV. I've pinched a gasket and had it leak. I use OEM gaskets, too.
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Old 01-02-2010, 07:02 PM   #10
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Thanx everyone. I'll pick up a new one today and make sure I do it right this time around. (though I was extra carefull to do it right before too)
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Old 01-03-2010, 12:06 AM   #11
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I've done a couple now. Every time I've used a OEM gasket and followed the m.net garage advice. I also always put the silicone dabs by the cam gears and CAS, as well as torque the bolts in sequence. Never had one leak.

BTW Vlad.....let me know if you want the other 2 wheels/tires. I have them sitting by the fireplace at the moment, but I'm thinking about trying to sell them. Let me know if you'd be interested dude!
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