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Old 04-09-2011, 05:25 PM   #1
Nick96'SL2
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Default 1998 Sc2 DOHC Valve Cover Gasket...

My 98 sc2 dohc needs a valve cover gasket. i pulled the #1 cylinder spark plug wire and there was like 1/2 of oil on it, and oil in the plug hole.

Well, my dads autozone rewards card has $20 credit on it, and i'm going to autozone to buy a new one. But i went online and looked at the picture of it and it doesn't look right.....

http://www.autozone.com/autozone/par...72507_69281_0_


^^^^^Is this gonna fit? ^^^^^


also, any tips on changing it??

Thanks guys

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Old 04-09-2011, 05:37 PM   #2
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1998 SC2
Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

That is the correct part. The little bolts are torqued to 89in-lb which is about 7.5ft-lb and if you exceed that they break. There is a specific torque pattern for the bolts also and they are torqued in stages in rotation. The corners are installed first ad the rest tucked into place. A small blob of RTV is placed on the 2 places where the timing cover meets the head. The head surface and cam cover surface has to be absolutely oil free or it will leak. use acetone for the final clean. You can use brake cleaner for the initial cleaning.

Intake
9--5--6--10
--3--1--2
8--4--9--11
Exhaust

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Old 04-09-2011, 05:46 PM   #3
Nick96'SL2
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

Quote:
Originally Posted by OldNuc View Post
That is the correct part. The little bolts are torqued to 89in-lb which is about 7.5ft-lb and if you exceed that they break. There is a specific torque pattern for the bolts also and they are torqued in stages in rotation. The corners are installed first ad the rest tucked into place. A small blob of RTV is placed on the 2 places where the timing cover meets the head. The head surface and cam cover surface has to be absolutely oil free or it will leak. use acetone for the final clean. You can use brake cleaner for the initial cleaning.

Intake
9--5--6--10
--3--1--2
8--4--9--11
Exhaust

where is the "7" in your bolt order thing ... In between the 9 & 8 right?

i also have this black rtv gasket maker type thing that when dry turns into a dry hard rubbery feeling, and i have red gasket maker.

would either of them work? ^^

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Old 04-09-2011, 09:04 PM   #4
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1998 SC2
Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

Either the red or black will be fine but black is the better one.

Seems I can not read my notes.

Intake
9--5--6--10
--3--1--2
8--4--7--11
Exhaust

That will fix that problem....


8 and 9 are the 2 on the timing chain end. there are only 11 bolts total

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Old 04-09-2011, 09:17 PM   #5
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

Quote:
Originally Posted by OldNuc View Post
Either the red or black will be fine but black is the better one.

Seems I can not read my notes.

Intake
9--5--6--10
--3--1--2
8--4--7--11
Exhaust

That will fix that problem....


8 and 9 are the 2 on the timing chain end. there are only 11 bolts total
Cool, thanks for clarifying.

I'll use the black rtv stuff i have.( i remember the package when i bought it, had a picture of a valve cover and gasket...)

Also, between the "10" and "11" bolt, like above the ECTS, i have oil leaking there too, could my cover be warped there, or could it just be the bad gasket?

Besides using a rag and long screwdriver, what's another way of getting oil out of the plug holes? ( my mechanic changed the plugs and wires, i'm surprised he did not tell me about the oil in plug holes)

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Old 04-09-2011, 10:01 PM   #6
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

I usually just pull the plug and let it run back into the cylinder. After the majority of it goes away, I go with the rag and screwdriver. You may want to check into a new set of wires as well, depending on how long you figure it was marinating-all that oil can soften them up. Last set of premium wires I bought at NAPA was like $23. I have followed Old Nuc's valve cover advice and only had one leak. I didn't quite get enough rtv around that corner or that particular cover was warped. Don't forget to let er set 24 hours if you can. That also gives that oil a long time to run down from the wet hole...

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Old 04-09-2011, 11:15 PM   #7
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

Quote:
Also, between the "10" and "11" bolt, like above the ECTS, i have oil leaking there too, could my cover be warped there, or could it just be the bad gasket?
Might as well check it for warp while it is off. Lay it face down on a flat table and see if it touches the table all the way around. Then turn it over and check that the intake side, exhaust side, and left end gasket groove is straight between the corners. Use a straight edge.The left end tends to bow and that will cause it to leak. You can install a new gasket on a warped or twisted cover and it may hold but the best approach is to replace. Do not even think about "just tightening" the bolts as they only go so far and then break. The cover floats between the gasket and the rubber isolators on each bolt. It is effectively suspended in rubber.

The cover, gasket, and head have to be absolutely oil free or it will leak. Acetone is the best final cleaner you can get your hands on.

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Old 04-10-2011, 07:54 PM   #8
Nick96'SL2
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

Found my tube of the black rtv stuff i have. the link isthe exact thing i have

http://www.autozone.com/autozone/acc...er=526681_0_0_


so, i would put this rtv between the two parts, where the timing cover meets the engine? i put a dab on the 2 cracks where they meet together between the gasket, And the engine? ( grammar?)...lol


--------- <gasket
**** < RTV
------- < Engine ( the crack) << correct?

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Old 04-10-2011, 08:15 PM   #9
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1998 SC2
Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

Thats it, right there. There is usually a bit of space or a step there and if not fixed with the RTV it will leak, a bunch. Let it cure overnight so it does not just wash out.

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Old 04-11-2011, 02:11 AM   #10
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

I have 0.040 off my head and used the black 1ST AYDE RTV. It works perfect to take up the seal for the little gap on timing cover and head. I also just used a new Fel Pro gasket that worked great on the Valve Cover. I also used it on Timing Cover and a few otherplaces on a complete DEEBS Build. No Leaks, as I just ran it on the track tonight for a total of about 50 laps. I race dirt track ovals and man this build is a scary one for that. The damn thing pulls so hard in the corners that I have to figure a new suspension set up.

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Old 04-14-2011, 01:56 PM   #11
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

Having issues with getting the valve cover to stop leaking.
I've tried everything.
Any special instructions, I've read above and have tried. The cover does not appear to be warped, but will check again.

I also had issue with the gasket not looking or mating correctly to the cover. If you turn it upside down it looks correct.

I did not follow a torge sequence. I'am a experienced mechanic and go by feel. But if this is a critical torge spec, it would be a first for me.

Also have done the Saturn covers before and not had this much trouble.
I'm working on a 98 SL2 Twin Cam.

Have cleaned the mating surfaces rigously.

Last attempt made with a thin coat of #2 permatex. Don't usally need to do this. This also did not work.

Dan

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Old 04-14-2011, 02:16 PM   #12
OldNuc
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

Well, exactly where is it leaking at? It makes a difference as what might work to fix it.

If you are using the FelPro gasket correctly fitting it to the cover can be difficult as there is more gasket than cover. The cover floats between the gasket and the elastomer isolators on the bolt assemblies. The tightening pattern is moderately critical but as long as the bolts are tightened down in stages in order the cover usually seals. They all have to bottom against the head to provide the proper tension. Any oil film on either the head or gasket will usually result in a leak with a problematic cover. Usually the left end bows out and this releases the pressure on the gasket and oil leaks from there.

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Old 04-15-2011, 05:48 AM   #13
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

Removed the Cover, rechecked on a flat surface again, this time I did find the cover was warped. So the problem is now understood. I cleaned both mating surfaces and proceeded to apply a silicone base around the heads mating surface. Let it skin, then applied the cover very carefully. I used the torgue sequence given, and then walked away for night.

If this does not work, I wonder if anyone has had success at filing the offending corners to square up the mating service. I have not read where anyone has attempted this, but as long as you approach it carefully I believe this could help to correct the issue.

I found that my cover appears to be bowed on the drivers side above the temp sensor. If the corners were files a bit it may bring the cover back to a closer spec. What say you to this, if the seal doesn't hold

Thanks,
Dan

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Old 04-15-2011, 06:07 AM   #14
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

Which DOHC covers seem to seal better / warp less... the alloy or plastic units?

...
J.R.
'01 SC2
SoCal

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Old 04-15-2011, 07:14 AM   #15
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

The aluminum is warp free. 93-95 to replace 96-98 plastic. You are stuck with the 99 and newer plastic.

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Old 04-16-2011, 01:40 PM   #16
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

Just a note to state that I was able to seal the cover.
The silicone did the trick
I still think that filing a cover corner on my valve cover may have solved the problem as well.
The idea is to plain the cover to a flat position.
I would only try this if I was looking at no other solutions but a replacement, by that time, theres nothing to loose, saving the gasket if it gets damaged or stretched.

I also didn't understand why Fel Pro designed the gasket in reverse. Although I could make it work, I didn't like the misformed gasket.

Thanks to all who contributed to my successful repair of the leaking new valve cover gasket. The Plastic Valve cover was not a bright idea.

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Old 04-16-2011, 04:50 PM   #17
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

When you found out it was warped and you cleaned the mating surfaces.

Did you apply the rtv alone to the mating surfaces or did you also incorporate the Felpro gasket along with the silicone rtv?

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Old 04-16-2011, 07:59 PM   #18
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

Once you find the plastic cove is warped about al you can do is either replace it or experiment. The FelPro gasket is exactly like the OEM except it is blue. The narrow tongue is supposed to fit into the mating grove in the cover.

Quote:
Originally Posted by Great Cars View Post
Just a note to state that I was able to seal the cover.
The silicone did the trick
I still think that filing a cover corner on my valve cover may have solved the problem as well.
The idea is to plain the cover to a flat position.
I would only try this if I was looking at no other solutions but a replacement, by that time, theres nothing to loose, saving the gasket if it gets damaged or stretched.

I also didn't understand why Fel Pro designed the gasket in reverse. Although I could make it work, I didn't like the misformed gasket.

Thanks to all who contributed to my successful repair of the leaking new valve cover gasket. The Plastic Valve cover was not a bright idea.

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Old 05-01-2011, 03:17 AM   #19
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

Quote:
I also had issue with the gasket not looking or mating correctly to the cover. If you turn it upside down it looks correct.

I am replaciing the gasket on my 96 SL2 DOHC, and I am having the same issue with the gasket looking as if it is made upside down... here are a few pictures...

The 1st on left is with the two sides pressed in the valve cover, notice how the wavy part is not matching correctly.

The 2nd is with the gasket turned upside down, and this way the gasket looks as if it would fit as formed (if it could be pressed in this way, but it can't)

The 3rd is with the 'wavy' part of the gasket pressed in to match the cover. This way the ends of the cover that stick out do not match, as one is too short, the other too long.

If I just press it in will it still seal correctly since the top and bottom part of the gasket that actually seal with the mating surfaces are flush?
Or is this the wrong gasket? I do not have the exact part number right now ( i may come back and edit, as it is in a post of which I asked for info for this R/R, just too tired and after dealing with it today and still not getting it on after over a week of trying to fight the rain, I'm too worn out) but I did follow directive of memebers on thios forum for the correct part.
I have the composite 11 bolt cover.

Any help is greatly appreciated... hopefully the pics help in understanding what is wrong with it!
Attached Images
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Old 05-01-2011, 04:17 AM   #20
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Default Re: 1998 Sc2 DOHC Valve Cover Gasket...

Just squeeze it in. It's not made of a solid material. It forms just fine to the valve cover.
Be glad it "almost" looks like it'll fit. One's I've gotten have looked like they're made for a wider & longer head, but they still worked fine.

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