C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Leaking valve cover?

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Old Nov 1, 2017 | 12:23 PM
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Default Leaking valve cover?

Started smelling it every now and then. Here are some pics. Just thought I'd ask before take stuff off. Weird, because I used felpro gaskets when I changed the valve cover gaskets, in may 2014.




This is how my fingers got when I put them where valve cover meets the head, on the left side.



I don't know why oil comes out of there. The bolt is tight.

Last edited by 1993C4LT1; Nov 1, 2017 at 12:24 PM.
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Old Nov 1, 2017 | 12:39 PM
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which fel-pro gaskets did you use? VS50443R are for the 93-96 composite valve covers and are supplied with sealing (washer) gaskets for the mounting hardware. when you say the bolt is tight, are they torqued to spec? (106 in.lbs.) I've found in most cases, over-torqueing VC hardware causes leaks.

Last edited by Joe C; Nov 2, 2017 at 07:27 PM.
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Old Nov 1, 2017 | 05:45 PM
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I probably did over tighten them, and yes it did come with the sealing washers. Oh well, at least it is an easy fix. Passenger side is dry as can be
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Old Nov 2, 2017 | 07:18 AM
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Brandon,

I wouldn't worry about it, they all seep/weep eventually. Just keep it clean under there all you can do man.
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Old Nov 2, 2017 | 05:28 PM
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On my car someone replaced the gaskets and rear of gasket fell out of groove on both sides. Surprisingly there wasn't a major leak. You might try to use a mirror to be sure it's just seepage.
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Old Nov 2, 2017 | 07:25 PM
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Originally Posted by TorchTarga94
Brandon,

I wouldn't worry about it, they all seep/weep eventually. Just keep it clean under there all you can do man.
That's what I do for the most part. But when I popped the hood to clean it, I saw oil on the head, right under the valve cover. I'll just remove it, see what's up.
Originally Posted by Kevova
On my car someone replaced the gaskets and rear of gasket fell out of groove on both sides. Surprisingly there wasn't a major leak. You might try to use a mirror to be sure it's just seepage.
I've seen that happen before. I'll check it with a mirror.
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Old Nov 4, 2017 | 07:06 PM
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Originally Posted by Kevova
On my car someone replaced the gaskets and rear of gasket fell out of groove on both sides. Surprisingly there wasn't a major leak. You might try to use a mirror to be sure it's just seepage.
I can see where that's a common problem with center bolts. I highly recommend this stuff -

been using it for years . basically, it's not a sealing goop, but a mild adhesive that will hold the gasket in place during assembly. works great on center bolt valve cover gaskets. just spray a light coat on the gasket and position it on the VC. holds perfectly while positioning the VC's to the cylinder heads.

Last edited by Joe C; Nov 4, 2017 at 07:06 PM.
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Old Nov 11, 2017 | 10:36 PM
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I replaced the gasket with one from Chevy. I used a 3m spray before laying the gasket. Put it in the groves correctly. Drove it today, let the engine cool down. Just check where it was leaking previously, and it still is.

I did notice when I had the valve cover off, it had the slightest crack. Would that be causing it leak? Only pissed because the valve cover didn't always leak.
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Old Nov 13, 2017 | 05:53 AM
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where is the crack, by the leak?
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Old Nov 13, 2017 | 08:25 AM
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Yes it does leak where the very small crack in the valve cover is. But it seems to leak more than just that spot.
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Old Nov 14, 2017 | 07:43 AM
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Originally Posted by 1993C4LT1
Yes it does leak where the very small crack in the valve cover is. But it seems to leak more than just that spot.
You should replace the valve cover. That may correct the other leaks. It needs replaced anyway.
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Old Nov 14, 2017 | 08:29 AM
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Will do. And it's not even visible unless you take the valve cover off. It has the crack where the gasket goes, again super small crack. But I figured the new gasket would stop the leak.
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Old Nov 15, 2017 | 06:07 AM
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Good luck and let us know what it does.
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Old Nov 23, 2017 | 03:01 PM
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I guess I forgot to wipe what was there before. Driven the car about 50 miles, and put my fingers where it leaked previsouly. No leaks Still, if it leaks I'll keep you guys updated.
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