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

Intake manifold gasket problem

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Old May 13, 2002 | 08:26 PM
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Default Intake manifold gasket problem

I have attempted to replace the intake manifold gasket on my L-98 car and am having a problem with installing the new one. The gasket is the paper/metal sides and rubber for the ends. I followed the instructions that came with the gasket that said to put a bead of gasket sealer across the edges of the block before installing. I did this, pieced everything together, and set the intake on. Now the problem the gasket sealer is acting like grease and when I torqued the bolts down it squeezed the rubber end gaskets out:mad . Anyone have any advice from experience that may help me out? Any suggestions would be greatly appreciated.
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Old May 13, 2002 | 08:28 PM
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I used black RTV and let it sit for about 15 mins. to get tacky before installing.
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Old May 13, 2002 | 08:28 PM
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Default Re: Intake manifold gasket problem (White91)

Don't use the rubber front and back pieces. Just a nice thick bead of silcone, hi-temp rtv or similiar.

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Old May 13, 2002 | 08:34 PM
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Default Re: Intake manifold gasket problem (James94LT1)

I swear I'm the only person on earth that's had good luck with the rubber gaskets on the china walls. The ones that came with my old fel-pro kit had tabs to keep them in place and I've never had a leak. Unfortunately, the Fel Pro 1204s only came with cork. Go figure. :mad

Guess I'll be trying the RTV method this time.
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Old May 13, 2002 | 08:40 PM
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Default Re: Intake manifold gasket problem (White91)

Just run a thick bead of RTV instead of the front and back seals. Clean the surfaces with brake cleaner or something similar so that the silcone sticks.
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Old May 13, 2002 | 08:48 PM
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Default Re: Intake manifold gasket problem (White91)

If you get the FelPro intake gasket set, P/N 93318, it comes with the gaskets needed and a tube of black RTV for the two block end lands.

The instructions say to put a 3/16" bead along the lands and some up onto each gasket. Then proceed immediately to lay the base on as the RTV sets up (skins over) in about 10-15 minutes.
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Old May 13, 2002 | 10:01 PM
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Default Re: Intake manifold gasket problem (White91)

Do not use the end pieces. RTV only.

Vic
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Old May 13, 2002 | 10:11 PM
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Default Re: Intake manifold gasket problem (Vic'89)

I agree RTV only.
:cool:
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Old May 13, 2002 | 10:25 PM
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Default Re: Intake manifold gasket problem (White91)

Thanks for all the advice guys. To be honest with you I was suprised to get the rubber pieces with the rest of the gasket. I just thought everybody used RTV for the ends. I just wanted some reasurance that I was thinking the right idea. I know on "Horse Power TV" that they only use RTV. :yesnod:
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Old May 13, 2002 | 11:23 PM
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Default Re: Intake manifold gasket problem (White91)

TV wouldn't lie......... I used the O2 sensor safe blue stuff. Also a forummember advised to use a punch and make a dimple every inch or so on the china wall and the ends of my new Accel SuperRam Base. Yes some of the goo oozed out,when tightening. I threw away the cork end peices as advised by the forum. you guys are great!!!
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Old May 14, 2002 | 12:12 AM
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Default Re: Intake manifold gasket problem (White91)

My fel pro set came with a tube of black RTV also.
One thing I was told was to set the manifold down exactly where it is going to stay. If you move it around to line up the bolts it will not seal.
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