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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-04-2006, 02:29 AM   #1
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Default Best RTV

I'm possibly going to re-seal my HVII to the UIM.
Here is a pic of the HVII on top of the LIM:
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The stock UIM gasket is between the HVII and LIM.
I currently have red RTV between the HVII and UIM.
So what would be the best RTV considering the temperature, plastic-plastic contact, and oil fumes from the PCV?
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Old 05-04-2006, 02:42 AM   #2
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The stuff in the black can with the touch nozzle. I think it'* called "The Right Stuff" or something along those lines.

EDIT:


from http://www.devcon.com/devconcatsolution.cfm?catid=66
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Old 05-04-2006, 02:49 AM   #3
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That dosen't really say how it works with plastics and it says 'low pressure seal'. Would this be ok for 20 or so inches of Hg in the UIM?
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Old 05-04-2006, 02:51 AM   #4
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How about the Ultra Series they mention?
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Old 05-04-2006, 08:46 AM   #5
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When I buy RTV there'* only one tube. Permatex Ultra Copper.

It works for all applications, Gas, Water, Oil, Air, Exhaust and has never let me down. Good adhesion properties. I applied a small amount to the Canadian car EGR pipe where it was leaking and haven't heard anything since.
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Old 05-04-2006, 09:55 AM   #6
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Quote:
Originally Posted by BillBoost37
When I buy RTV there'* only one tube. Permatex Ultra Copper.

It works for all applications, Gas, Water, Oil, Air, Exhaust and has never let me down. Good adhesion properties. I applied a small amount to the Canadian car EGR pipe where it was leaking and haven't heard anything since.
Yeah, it seemed to fix the slightly rough idle. To be honest I don't even think about it anymore. I'll check again tomorrow.
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Old 05-04-2006, 03:13 PM   #7
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Ok thanks guys. I'll check out the Ultra Series then (copper).
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Old 05-04-2006, 06:12 PM   #8
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Even though I'm chiming in alittle late, I second the copper. I've used it and it'* held up great in high temps and I'm pretty sure the tube says it good to 600 degrees F.


Ed
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Old 05-05-2006, 01:21 AM   #9
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95naSTA I recognize that picture.

Whichever RTV you use be sure to extrude a test bead, and let it sit over night, to be sure it will cure all the way through. I don’t know if Permatex Ultra gets old or if they have bad batches but I have two tubes of the stuff that just sits there and never cures.
When you find a good tube of Permatex Ultra a ¼’ bead should cure all the way through in over night or sooner.
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Old 05-05-2006, 11:52 AM   #10
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I've had similar bad experiences with the ultra copper; either it didn't cure completely, or it cured but didn't bond well enough to prevent leaks.
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