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

Gasket replacement + a few pics...

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Old May 26, 2008 | 10:33 AM
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Good call on the V/C bolt gaskets. I didn't see anything durin' breakdown, and kinda' wondered about that. I haven't opened the gasket boxes yet.

I broke down on doin' the TB myself. The carbon on the bores was incredible - I don't see how this thing even ran. And fine at that.

All the carbon came out great - includin' that IAC bore. Hardest part cleanin' the TB was the coolant encrustation on the hose nipples. The rubber TB diaphragm was still supple - scrubbed with armor all and a toothbrush. I'll soak it later with the injector O-rings in Trans-X.

All those stains ain't goin' anywhere tho'. Oh well...

And don't forget the mosquito marinade (yellow circle).
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Last edited by schrade; May 30, 2008 at 12:39 AM.
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Old May 26, 2008 | 10:49 AM
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Those little inserts where the holes are for the valve cover bolts should just press out - those are the donuts that should be included in the gasket set. Also be careful to torque the valve covers properly - mine were leaking pretty good, and I think it's because they were over-tightened when they did the rocker arm recall.
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Old May 26, 2008 | 12:50 PM
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Originally Posted by pianoguy
Those little inserts where the holes are for the valve cover bolts should just press out - those are the donuts that should be included in the gasket set. Also be careful to torque the valve covers properly - mine were leaking pretty good, and I think it's because they were over-tightened when they did the rocker arm recall.
I just found them when I opened the new gasket sets. Thanks piano.

Unfortunately, I did not find the rubber TB diaphragm (mine is still plenty supple anyway), and I did not find the TB coolant body gasket. Off to the sto'...
ed!!! $20 for the TB-coolant passage gasket. AND a 3 day wait. Damn. I can buy a whiff of gas for $20. I ordered, then cancelled. Hello RTV.


Little grease film on the gasket/diaphragm, little on the bolts...
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Last edited by schrade; May 26, 2008 at 01:24 PM.
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Old May 26, 2008 | 02:23 PM
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Default TB almost done...

...so I took my first shortcut usin' RTV instead of a gasket. Clear too. Shoulda' used colored to make sure of a good thin layer, but it felt good goin' on.

Coffee's kickin' in on the second pic.

I still need feedback on the TPS placement there...
http://forums.corvetteforum.com/show...post1565623135
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Last edited by schrade; May 26, 2008 at 02:27 PM.
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Old May 26, 2008 | 02:29 PM
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I noticed Autozone and Advance do not have the full TB gasket kit in their computers. I saw GP Sorenson part # here somewhere and both places said they may be able to order if I take it to them. Theres smaller stores around too but their hours suck.... might try some of them.

Or just go the RTV route like you did...

I happen to have 2 basic TB to Intake gaskets now.
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Old May 26, 2008 | 02:31 PM
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PS you need to get some Mother's Aluminum polish. That **** is the bomb
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Old May 26, 2008 | 02:42 PM
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Originally Posted by geist
PS you need to get some Mother's Aluminum polish. That **** is the bomb
Hey there ghost...

How does the aluminum polish clean off? I got this TB cleaned (except for the stained aluminum), and it's bagged now waitin' to hook back up. I'm not wantin' to get anything into the passages now.................
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Old May 26, 2008 | 05:37 PM
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Thread chasin' in the intake...

Spray some thin lube in to the bottom of the hole, then run the bolt all the way in twice. Then drop the bolt into the parts cleaner, make sure the hole is horizontal, and blow it again with the light lube. It gets the grit out. Then blow off the bolt, hit it with light oil, and put the bolt back til you're ready for assembly.

There's NOTHIN' like a bolt turnin' freely in the hole with no grit (kinda' like lovin' ).

Sure is a pisser when the bolt won't 'catch' with the ratchet on re-assembly - NOT!!!

The fuel rail, and injector O-rings are left, the intake still has to go out for a dip, and yikes - the worst part... shop-vac-in' the intake ports and the lifter valley where the seaweed and kudzu fell in.


ed.: PIC 3... Does the EGR gasket have metallic heat paste, or somethin' like that, between it and the intake? Ya' think thread anti-seize #13 with copper will work as well?
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Last edited by schrade; May 26, 2008 at 05:41 PM.
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Old May 26, 2008 | 05:50 PM
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Originally Posted by schrade
How does the aluminum polish clean off?
Wipe and buff a little with a terry cloth, or good paper towels like Viva. You should be able to keep it out of the passages, but a little throttle body cleaner I guess could clean up residue if it bothers you. I polished the inside of my TB a little too and figured I'd hit it with some TB cleaner on a rag just to be safe. Not sure if it makes a difference?

Mine still has some little spots but OMG it looks SOOO much better and shiny. I tried putting a little brake cleaner on one spot, a hack I read about somewhere, but didn't make a diff. Short of using something more abrasive and time consuming this is as good as it will get

and my fuel rail looks god-lke, not sure I want to put the covers on LOL

seriously, get some Mothers polish!
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Old May 26, 2008 | 05:55 PM
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Originally Posted by schrade
Spray some thin lube in to the bottom of the hole, then run the bolt all the way in twice. Then drop the bolt into the parts cleaner, make sure the hole is horizontal, and blow it again with the light lube. It gets the grit out. Then blow off the bolt, hit it with light oil, and put the bolt back til you're ready for assembly.
Ok I am soon going to be reinstalling ALOT of bolts. My garage is full of labeled ziplock baggies.

What do you use for the "thin lube" and "light oil"? I was just going to clean them off with WD40 or PB Blaster, I have both handy.
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Old May 26, 2008 | 06:59 PM
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Originally Posted by geist
Ok I am soon going to be reinstalling ALOT of bolts. My garage is full of labeled ziplock baggies.

What do you use for the "thin lube" and "light oil"? I was just going to clean them off with WD40 or PB Blaster, I have both handy.
Hey there geist...

Probably doesn't matter what brand - I been usin' WD-40 only cause I got more of that that anything. I DO imagine that the thinnest, lightest stuff will blow back out of the bolt hole with the most 'speed', and carry out the grit and grime. WD is okay, but it's a little more viscous that PB I think. Just plant that red spray attachment in the bottom of the hole, and have the hole level for best drainage.



There's probably a couple of ways to pull the injector clips, including tool Jxxxx for $35. I pulled mine with a small screwdriver - pic 1. Get under the clip, and roll the blade toward the injector body. All 16 - 8x2, came out problem free.

Every fuel rail-end O-ring stayed in the rail. Be careful prying it out - that ring is only an inch or 2 from the intake port, and needs to seal good, w/o vacuum leaks.

The tip O-ring was not too much problem.

They O-rings are cleaned, and soakin' in Trans-X til re-install. That stuff makes rubber VERY soft.
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Last edited by schrade; May 26, 2008 at 07:02 PM.
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Old May 26, 2008 | 07:19 PM
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O-rings are pocket change, replace them!

I heard here that dish soap is best for the orings... I had used motor oil in the past but apparantly thats bad.

My injector clips came out easy with a screwdriver too, can't believe people spend 35 on a tool!

WD40 - that won't really last tho over time will it? I once did a headgasket and used anti-seize just about everywhere for all the parts I removed in the process... had silver smears just about everywhere too. I live in Chicago area and bolts get rusty... sadly this vette was driven in the winter a few years, but looks to have been covered with oil from before that so alot of stuff is in good shape.

gotta get out there, missing valuable day-off daylight and I am a slow putz
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Old May 26, 2008 | 07:41 PM
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Originally Posted by geist

WD40 - that won't really last tho over time will it? I once did a headgasket and used anti-seize just about everywhere for all the parts I removed in the process... z
WD is just while the bolt goes back into the hole to keep them and the bolt itself clean.

I got the intake bolt holes clean, and when it goes in the tank, I DO NOT want anything settlin' in the holes.

At re-assembly, I use anti-seize with copper almost everywhere, except gaskets. They get a thin layer of grease, like the rubber TB diaphragm post #23 pic 1.


PIC 3 post 28 ... Does the EGR gasket have metallic heat paste, or somethin' like that, between it and the intake? Ya' think thread anti-seize #13 with copper will work as well?
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Old May 26, 2008 | 08:32 PM
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Didn't you see my earlier post on the NAPA part number for the TB gasket set?

No one else has a full gasket set for the darn thing!

I know, I tried to find one years ago when I rebuilt an 88.
Since they take afew days to get I always have 2 on the shelf in the garage.
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Old May 26, 2008 | 08:46 PM
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Originally Posted by jaa1992
Didn't you see my earlier post on the NAPA part number for the TB gasket set?

No one else has a full gasket set for the darn thing!

I know, I tried to find one years ago when I rebuilt an 88.
Since they take afew days to get I always have 2 on the shelf in the garage.
Hey jaa...

I saw it, but didn't really note it since I had already purchased intake and V/C gaskets about 5 weeks ago. I never opened 'em to see if they actually had ALL the gaskets.

Now I got the TB coolant attachment sealed. I'm gonna' stay with it.

But how 'bout the EGR gasket-to-intake anti-seize?
PIC 3 post 28 ... Does the EGR gasket have metallic heat paste, or somethin' like that, between it and the intake? Ya' think thread anti-seize #13 with copper will work as well?
Thanks...
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Old May 26, 2008 | 08:50 PM
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The OEM EGR gasket is metallic, don't think any sealer or antiseize was used.
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Old May 27, 2008 | 11:28 AM
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Default What can ya' do to an injector with a hammer, a prybar, and a 16mm open end?

This:
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To Gasket replacement + a few pics...

Old May 27, 2008 | 12:42 PM
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Sorry I got here late but the fuel lines do not have to be taken off to do this job. All that is needed is to pull the rails and flip them over onto the surge tank. It also make for easy replacement of the "O" rings.

For future reference the Felpro intake kit comes with the TB gasket and "O' rings for the injectors as well as the AIR gasket.There is no need to remove the EGR to do this just unplug it.That is why the Felpro kit does not have that gasket. Another tip is to scuff the forward and rear of the intake and block with some sand paper and use Permatex " The Right Stuff" RTV You can start the car pretty much as soon as you get it back togther with that "stuff". I have done a couple of these and can do it in about 2-3 hrs now.

Like I said a little late on this post but it may help someone else.....
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Old May 27, 2008 | 12:46 PM
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Default Injectors after the toothbrush...

... and ready to re-assemble and bag up...

Screen baskets are re-inserted, body is brushed, O-rings are installed and lubed with Trans-X, and the rails were dis-assembled, swabbed with Q-tips and bushed off with toothbrush, and re-assembled.



Originally Posted by Redeasysport
I have done a couple of these and can do it in about 2-3 hrs now.
.
WOW! I need to start up the coffee pot! I got about 22 hours in it right now...
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Old May 27, 2008 | 01:15 PM
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Well you are doing quite a bit more than I would have. I just flip the fuel lines and TB out of the way and do the gaskets. I disconnect as little as possible not even the hoses off the TB. You can spend a lot of time cleaning and detailing but I say screw it fix it a drive it like you stole it. A litlle wipe here and there is good enough for me. The worst part is gettin at the oil build up off the front but again a good job on that can wait till the opti goes( as we all know it will).
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