Valve cover gasket: plastic or cork? - JeepForum.com

View Poll Results: What type of gasket (4cyl 2.5L)
Cork 16 51.61%
Plastic 15 48.39%
Voters: 31. You may not vote on this poll

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post #1 of 18 Old 05-22-2007, 09:00 AM Thread Starter
merlin2375
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Valve cover gasket: plastic or cork?

Need to order one from autozone, what do you guys think. I searched and read all the old threads but wanted more opinions.

1) Seems like a pretty easy job if I use cork should I use RTV/gasket maker and if so what kind. Same for plastic?

2) I need to check my haynes manual but there is definitely a torque spec for the bolts, but what about a tightening order?

3) What's good to clean the inside of the valve cover (simple green)

4) Anything I should be worried about?

Thanks in advance!

p.s 95 YJ, I4 2.5L.


1995 YJ Rio Grande | 2.5L 4 cyl | 4" skyjacker suspension lift | 33x10.5 tires on AR rims | 105K on the odo
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post #2 of 18 Old 05-22-2007, 09:05 AM
97bigxj
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1-Cork with RTV on top and bottom worked well for me
2-I did the 2 back the 2 front then opposite sides going to the back
3-I used a parts cleaner for the valve cover and a wire brush it was nasty but definitely came out shiny and new
4-No worries just take your time and give that valve cover the love it deserves
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post #3 of 18 Old 05-22-2007, 09:23 AM Thread Starter
merlin2375
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thanks man, yeah I'll definitely be taking my time. What kind of RTV did you use? I have some RED, high temp stuff lying around. Is there something better?

1995 YJ Rio Grande | 2.5L 4 cyl | 4" skyjacker suspension lift | 33x10.5 tires on AR rims | 105K on the odo
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post #4 of 18 Old 05-22-2007, 09:40 AM
97bigxj
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I used the black mainly because it's supposed to be the most oil resistant.
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post #5 of 18 Old 05-22-2007, 10:30 AM
Mitchness
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Cork, plastic, rubber- it doesn't really matter. The valve cover gasket isn't pressure baring or hi-temp anyway. Heck you could prolly get away with just thick bead of RTV if you wanna try it. The type of gasket isn't that important in this case. Just make sure the RTV is thick enough all the way around. Go to Napa or somewhere and get some Permatex "Right Stuff". Good, strong RTV.

Quote:
Originally Posted by CopperHead_Road View Post
Then again, I live in the mountains and sip (non-taxed) corn whiskey for a living... I may not know what the heck I'm talking about... lol
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post #6 of 18 Old 05-22-2007, 10:31 AM
bobbert350
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i used cork and rtv works fine

88 jeep wrangler, 4.2, auto---cragar soft 8's, d35 locker, bucket seats with 5 point harnesses, warn bumper w/ grill gaurd, winch plate, kc daylighters, light bar, herc the interrior, rebuilt tranny (yay) with tranny cooler, winch and msd ignition, 3.5 inch fabtech lift, currie boomerang shackles f/r, weber carb...[B]

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post #7 of 18 Old 05-22-2007, 10:56 AM
coachchuck
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I don't use either.
Clean both surfaces good.
Use RTV, -Red, Black or Blue (what ever I have handy at the time)
Let it cure overnight.
I have found this to work as well as gaskets for the valve cover.
Been doing it like this on various vehicles since 1974

Chuck
Sold : 93 YJ, 33s, 4.1, HO 4.0, AX15, d300 flipped
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post #8 of 18 Old 05-22-2007, 11:01 AM
lturley
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Plastic? Never, ever use sealant on cork! It will generally make it squeeze out, cork must be used dry. I vote for the plain RTV on CLEAN surfaces.
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post #9 of 18 Old 05-22-2007, 11:03 AM
Angelous
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sure tack adhesive spray on a cork gasket!!

"There is no hole to deep, or mountain to steep, for the driver of this Jeep!"

87 YJ - 2.5 - TJ Flare Swap - Rubicon's - no track bars -
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post #10 of 18 Old 05-22-2007, 02:56 PM
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Quote:
Originally Posted by lturley
Plastic? Never, ever use sealant on cork! It will generally make it squeeze out, cork must be used dry. I vote for the plain RTV on CLEAN surfaces.
I agree!! My first valve cover seal I replaced using cork with RTV, as that's what people on here recommended to me, and it squeezed out and leaked BAD, probably worse than it did before. Thought it was my rear main seal because "hey, I already replaced the valve cover seal so it can't be that." Decided to do it again with dry cork and my 20 year old engine is almost completely dry underneath now

'87 YJ Laredo - 4.0L, AX-15, NP231, 4.10s: 3.5" BDS, 31" Muds

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post #11 of 18 Old 05-22-2007, 07:05 PM
Pitr
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1) Felpro has cork ones. Bought it at pepboys, but autozone might have something different

2) 27ft/lbs start in the middle and work out a circular pattern...
and make sure your torque wrench works. Mine was bound up, and i snapped 2 bolts.

3) a can of brake cleaner, some soap, water, and brillo pad. mine was horrible...

4) don't overtorque
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post #12 of 18 Old 05-22-2007, 08:03 PM
84 400
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A trick i learned with sealing gaskets is to p[re soak them in maval mystery oil. I used it for all the gaskets when i rebuild a few small egins and seems to be holding up fine. don't think it would work with cork or plastic tho..... I would go cork and eather back or red RTV.

Lil' red islander: 1989 Yj 33's on 15 x10 american raceing wheels with 3.5 Tuff country lift kit and 1.5 lift schackles. 4.2L ba 10/5 231 front d30 d35c rear flowmaster SOLD SOLD SOLD

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post #13 of 18 Old 05-25-2007, 07:11 AM Thread Starter
merlin2375
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thanks for all of the responses guys! I ended up ordering a cork one...should be in shortly.

As far as using RTV with cork, I've read a lot of mixed things and most of the people with opinions have STRONG opinions either to use or NOT use RTV. So I figure I'm just going to use a very small amount to get the gasket to stay in place.....thoughts??

1995 YJ Rio Grande | 2.5L 4 cyl | 4" skyjacker suspension lift | 33x10.5 tires on AR rims | 105K on the odo
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post #14 of 18 Old 05-25-2007, 08:48 AM
vadslram
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Plastic, with a VERY thin RTV to hold it in. I go that way because then I don't have to replace it as often. I started back when I had a 69 mustang with solid lifter roller rockers, the darn thing always needed tweaking.
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post #15 of 18 Old 05-25-2007, 12:30 PM Thread Starter
merlin2375
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boy this is a tight poll! Just out of curiousity does anyone know what type of gasket was used from the factory is cork OEM or is plastic?

1995 YJ Rio Grande | 2.5L 4 cyl | 4" skyjacker suspension lift | 33x10.5 tires on AR rims | 105K on the odo

Last edited by merlin2375; 05-28-2007 at 07:29 AM.
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