88 s10 2.5 Valve cover Gasket - S-10 Forum
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88 s10 2.5 Valve cover Gasket

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Old 11-19-2011, 03:18 PM   #1
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88 s10 2.5 Valve cover Gasket

My 88 s10 is leaking oil at the valve cover gasket again. I replaced it about 2 years ago. the gasket I used was one I found under the seat when I bought the truck. It was quark and still in the box so I figured it was good but it didn't last long. So I am going to replace it soon. Should I use quark or rubber, and do I need to use the RTV make gasket? If so do I use it on both sides of the gasket?
Thanks,
Jonathan
Old 11-19-2011, 04:02 PM   #2
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I like the cork gaskets myself. And heres how I do my gaskets. Rtv on gasket, stick gasket to valve cover. Then rtv on the bottom of the gasket. A thin layer all the way around on both sides of the gasket Then tighten in an alternating pattern
Old 11-19-2011, 08:29 PM   #3
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Re: 88 s10 2.5 Valve cover Gasket

My truck had a cork gasket that leaked. I got a rubber felpro gasket for it, which also came with a new EGR gasket. I used spray adhesive when I put it on, and it's all good.

I'm pretty sure I asked the mechanics at my company what they recommended before I did it and they said rubber gasket with spray adhesive.
Old 11-21-2011, 05:42 PM   #4
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Re: 88 s10 2.5 Valve cover Gasket

Well I ended up getting the felpro cork gasket. It was way cheaper and all they had in stock anyway. I will install it like 90blues10 suggested. Thanks for your comments.
Old 11-21-2011, 05:45 PM   #5
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Re: 88 s10 2.5 Valve cover Gasket

Fact: The gm service manual doesnt even say to use a gasket on these motors. Just rtv silicon.
Old 11-21-2011, 07:33 PM   #6
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Re: 88 s10 2.5 Valve cover Gasket

Really that's interesting. Do you think that that would work as well?
Old 11-21-2011, 07:34 PM   #7
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Re: 88 s10 2.5 Valve cover Gasket

definitely not.
Old 11-22-2011, 11:41 AM   #8
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Re: 88 s10 2.5 Valve cover Gasket

Quote: Originally Posted by 90blueS10
Fact: The gm service manual doesnt even say to use a gasket on these motors. Just rtv silicon.
Kind of like the olds 307 that was put together without gaskets, just gasket maker stuff.
Old 11-22-2011, 07:37 PM   #9
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Re: 88 s10 2.5 Valve cover Gasket

Its actually best to use just silicone like GM recommends. It seals a lot better than a cork gasket. Also I wouldn't use silicone on both sides of the gasket. Put it on the valve cover side because it will be easier to get off the next time, instead of scraping it off the head. I used a cork gasket on mine only because my valve cover is bent up. Yet it still leaks.
Old 11-22-2011, 08:17 PM   #10
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Re: 88 s10 2.5 Valve cover Gasket

Well I used the cork gasket and put RTV on both sides. I may have used too much RTV but I think my valve cover is also slightly bent. I am letting it set overnight to make sure it all dries and I will see what happens tomorrow.
Old 11-22-2011, 08:26 PM   #11
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Re: 88 s10 2.5 Valve cover Gasket

After you let it dry tonight, tighten it a little bit more tomorrow and you should be fine.
Old 11-23-2011, 12:31 PM   #12
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Re: 88 s10 2.5 Valve cover Gasket

If you get a premium Felpro cork gasket, it has steel inserts in each bolt hole. This prevents over tightening and will keep the cork just compressed enough to last a while. I use RTV silicone on the VC side and keep the head clean. The gasket lifts off easily when replacing, you only have to dick with the VC side.
The main reason for premature gasket failure is overtightening.
Old 11-23-2011, 02:00 PM   #13
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Re: 88 s10 2.5 Valve cover Gasket

on older volkswagen motors they..

Use a cork gasket
only sealant the valve cover side
and put wheel bearing grease on the head side. Because VW's needed valve adjustment everyoil change be able to take it off then add more wheel bearing grease.. change the gasket every other three oil changes on them too
Old 11-23-2011, 03:32 PM   #14
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Re: 88 s10 2.5 Valve cover Gasket

Well I started the truck and drove it for 5 minuets and no oil leaks yet so I am thinking it is good.
Old 11-25-2011, 11:16 AM   #15
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Re: 88 s10 2.5 Valve cover Gasket

Good info: I just went thorugh the same thing on my truck, cork-- no luck, RTV ONLY: no luck (this one was more my fault though-- could see an uneven bead when removed), then my most recent and successfull method:

1) clean both surfaces
2) thin bead of rtv on vc side
3) apply rubber gasket on VC, use clothspins to help it set up,
4) one hour later light grease on rubber gasket
5) tighten to spec on head

No leaks 200miles later

Thanks
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