Need help with valve cover gasket replacement - JeepForum.com
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post #1 of 28 Old 02-17-2009, 06:15 PM Thread Starter
nasars
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Need help with valve cover gasket replacement

I have a 94 cherokee 4.0 engine that I need to replace the valve cover gasket, leaking in the front and the back. I have a GM factory repair manual, in the manual it states that the valve cover has an embedded silicone seal and if this seal is messed up I need to get a whole new valve cover. Seems odd to me to have to replace the whole cover to replace the seal. The service department said he thought that referred to models that have a plastic valve cover (mine is metal) and that I should havent any problems. Thier parts list showed a gasket for this miodel. I searched the forum and could not find my answer. For all you guys that have replaced these, help! Am I good with just a gasket or does the cover need to be replaced.
Thanks

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post #2 of 28 Old 02-17-2009, 06:37 PM
kboyts
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Quote:
Originally Posted by nasars View Post
I have a 94 cherokee 4.0 engine that I need to replace the valve cover gasket, leaking in the front and the back. I have a GM factory repair manual, in the manual it states that the valve cover has an embedded silicone seal and if this seal is messed up I need to get a whole new valve cover. Seems odd to me to have to replace the whole cover to replace the seal. The service department said he thought that referred to models that have a plastic valve cover (mine is metal) and that I should havent any problems. Thier parts list showed a gasket for this miodel. I searched the forum and could not find my answer. For all you guys that have replaced these, help! Am I good with just a gasket or does the cover need to be replaced.
Thanks
Well why do you have a GM manual for a jeep?
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post #3 of 28 Old 02-17-2009, 09:05 PM Thread Starter
nasars
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My bad, it's a Jeep manual.
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post #4 of 28 Old 02-17-2009, 09:06 PM
xjfever
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I replaced mine last summer. All you need is the gasket and some RTV sealant. Be sure to clean both surfaces well, and don't get anything down inside the head. A good thing to do is take a shop vac, and clean everything up once you have the head cleaned from the gasket material. And don't overtighten the valve cover bolts, or it will leak again.

  1. '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
  3. Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
4. 04 Dodge ram 1500 quadcab, yes, it has a hemi.
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post #5 of 28 Old 02-17-2009, 09:33 PM
XJaggerated
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If you end up getting a cork gasket make sure you go back and check the bolts a bit later. The cork likes to compress.

Cheers

Logan

'99 XJ Sport 4.0 4x4 @ 155k
AW-4
NP-231
C8.25 -22inches from hub to fender. how big is my lift?
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post #6 of 28 Old 02-18-2009, 12:01 AM
eshew
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Yep, used a FelPro cork gasket on mine, RTV'd both sides of the gasket. Been leak free for 3 years so far.

Make sure to clean out your valve cover while you have it off. I wire bruhed mine and cleaned it out with brake cleaner. The 2 towers inside the valve cover if cleaned well (inside & out) will reduce oil coming out of the breather tubes, same thing wire brush and some brake cleaner. I noticed the caps on the tower things had some sort of gasket, I just used some rtv on those as well (sparingly)
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post #7 of 28 Old 02-18-2009, 07:58 PM Thread Starter
nasars
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I got rubber gasket from the dealer, do I still need to use rtv sealer?
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post #8 of 28 Old 02-19-2009, 09:09 AM
AZ Jeff
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Quote:
Originally Posted by nasars View Post
I got rubber gasket from the dealer, do I still need to use rtv sealer?
I certainly would not hurt to use it in conjunction with the OEM gasket. Just don't glop on large quantities over the gasket. Just a thin film is all you need.

AZ-Jeff
I don't own an XJ any longer, but I still think they are the best of all the Jeep products ever made. My XJ was my favorite vehicle in my 50+ years of driving.
So...I stick around and give advice.
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post #9 of 28 Old 02-19-2009, 08:54 PM Thread Starter
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Thanks everybody!
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post #10 of 28 Old 02-19-2009, 10:10 PM
tallyjeepguy
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How many inch pounds are needed to torque the bolts for a cork gasket vs the inch pounds for a rubber gasket?
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post #11 of 28 Old 02-19-2009, 11:11 PM
Lynch_6913
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ya ive gone through 3 of these in 30000 miles... i believe i iver tightened and they kept leakin and all.. the cork ones didn;t hold up well... last time i busted one of the many bolts off so i think its stayin like it is...
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post #12 of 28 Old 02-20-2009, 12:43 AM
greenxj513
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two options:
RTV and torque cover bolts to 28 in-lbs
rubber gasket and torque cover bolts to 55 in-lbs

btw cork sucks, don't waste your time.... i use RTV on everything works fine.
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post #13 of 28 Old 02-20-2009, 06:47 AM
xjfever
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The cork gasket will work fine if you do it right. Overtightening the bolts is what kills the cork gaskets.

  1. '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
  3. Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
4. 04 Dodge ram 1500 quadcab, yes, it has a hemi.
5. '08 BMW X3, Mods in progress.
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post #14 of 28 Old 02-20-2009, 07:37 AM
90xjmark
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got one in the back end waiting for a day when i feel like doing it
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post #15 of 28 Old 02-20-2009, 08:30 PM
tallyjeepguy
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Quote:
Originally Posted by xjfever View Post
The cork gasket will work fine if you do it right. Overtightening the bolts is what kills the cork gaskets.
What is the right way to do the cork gasket?

RTV on engine and one side of cork, let set for 30 min, place cork onto engine; RTV on valve cover and cork set for 30 min, place valve cover on gasket; torque bolts to 28 inch-pounds in correct order. Let cure for 1 hr. start engine, search for leaks.

Do I have this down right?

I suppose the biggest issue my clumsy-self has is not dropping something into the head.
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