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CC Advertisers
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11-28-2009, 09:28 AM
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CC Member
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Join Date: May 2004
Location: centralia,
IL
Cobra Make, Engine: B&B cobra (sold), Hurricane HMS1002 (sold), Kirkham 289 FIA, (sold) RCR GT 40(sold) SPF GT40 2122(sold) Hurricane HMS2002, (sold) RCR SLC (sold) GTR on the way!
Posts: 1,288
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Not Ranked
How do you remove silcone sealer?
I am working on a little engine project and I pulled the pan to inspect the internals. The pan and windage tray are just covered in gasket material and silicone RVT. How can you get that stuff off?
__________________
High Maintenance Racing Team
Run & Gun 2003 - 2013 
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11-28-2009, 09:31 AM
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Banned
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Join Date: Oct 2003
Location: Yorba Linda,
CA
Cobra Make, Engine: SPF w/392CI stroker
Posts: 3,293
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Not Ranked
Goof-Off will work, but it just takes patience and a lot of rubbing. I knock off the big chunks with a razor scraper and then hit it with a rag dipped in lacquer thinner. Also a fine steel/brass brush will make quick work and it scuffs up the flanges just enough to allow the new gasket/sealant to bite.
-Dean
Last edited by RedBarchetta; 11-30-2009 at 10:20 AM..
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11-28-2009, 09:55 AM
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CC Member
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Join Date: May 2002
Location: Mission Viejo,
CA
Cobra Make, Engine: Kirkham, 427 side oiler
Posts: 225
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Not Ranked
Try Denatured Alcohol. You may need to soak the affected area. The silicone should lift off the surface.
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11-28-2009, 11:51 AM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Given that you are working on the underside of the engine with the pan off; needless to say you do not want any small pieces left behind that could end up in the oiling system.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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11-28-2009, 12:01 PM
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CC Member / Sponsor
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Join Date: Oct 2003
Cobra Make, Engine:
Posts: 808
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Not Ranked
Don't for get to use the 3m tape and some plastic 
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Squeaky wheel always gets the grease!!
www.gcperf.com
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11-28-2009, 01:11 PM
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Senior Club Cobra Member
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Join Date: Aug 1999
Location: Ellington,
CT
Cobra Make, Engine: Classic Roadster 351W, T5, Red & White
Posts: 3,478
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Not Ranked
Someone ( s ) please comment, heating with a hair dryer set on high would make the silicone and gasket sealer " easier " to remove/scrape off ? While the make up is entirely different, same approach as removing candle wax, which also can be frozen with ice cubes.
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2014 Porsche Cayman S, 2014 M-B CLA 45 AMG,
Unkown:"Their sweet lines all but take my breath away, and I desire them as much for their beauty as for their use "
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11-28-2009, 01:17 PM
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Regularly Offensive
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Join Date: Feb 2006
Location: yuba city,
ca
Cobra Make, Engine: spf
Posts: 1,231
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Not Ranked
Hire the removal out.........it's much faster and less messy.....
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Ed
Too close for missles, switching to guns.........
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11-30-2009, 10:01 AM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,452
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Not Ranked
I use a fine wire brush in a drill motor. Only takes a few seconds. Be sure to mask where needed, it can make a mess.
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11-30-2009, 10:30 AM
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CC Member
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Join Date: Jun 2004
Location: Potomac,
MD
Cobra Make, Engine: West Coast, 460 Ford Racing Crate w/ TREMEC TKO 600
Posts: 732
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Not Ranked
ENGINE FLANGE
I would avoid using any type of abrasives on the machined surface of the engine block oil pan flange (iron or aluminum block, goes without saying alum is more sensitive to scratches), block flange has a machined surface with a specific surface finish by design that you dont want to damage or alter to keep a good seal. To mechanically scrape the silicone off this flange, try using plastic scrapers (like the body shops use for bondo or other uses) you can cut them to size if needed. Final prep with a solvent to clean the surface (I know this it tough upside down with oil dripping!) before the new sealant bead goes onto pan for re-install.
OIL PAN FLANGE
The pan in your gallery seems to be a custom one but with a stamped steel flange (upper portion), these are more forgiving as far as surface roughness but try to avoid abrasives here also and use plastic implement here too when removing old sealant.
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"...some assembly required, ages 8 and up...... well that took longer than expected......
Last edited by kitcarbp; 12-01-2009 at 11:49 AM..
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11-30-2009, 12:41 PM
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Member of the north
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Join Date: May 2003
Cobra Make, Engine: A Cobra
Posts: 11,207
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Not Ranked
Air wire brush.
GM has used RTV since 1974. Their shop instructions were to use an air powered wire brush. Makes a mess, but it all comes off.
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I'm a writer, feed the artist and buy a book.
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11-30-2009, 05:31 PM
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CC Member
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Join Date: Jun 2005
Cobra Make, Engine:
Posts: 3,077
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Not Ranked
I agree a little pneumatic die grinder with a wire wheel and it is relaxing. As far as scratches left behing, the silicone you apply with the new gasket will easily fill the tiny voids and in addition help the silicone "bite" better. Now if I were working on the engine and internals exposed I would have to try a scraper and elbow grease but a component on the ground away from the car use the wire wheel.
Quote:
Originally Posted by trularin
Air wire brush.
GM has used RTV since 1974. Their shop instructions were to use an air powered wire brush. Makes a mess, but it all comes off.
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11-30-2009, 05:41 PM
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Senior Club Cobra Member
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Join Date: Jan 2007
Location: Sacramento,
CA
Cobra Make, Engine: Superformance 460 SVO
Posts: 305
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Not Ranked
I use a wire brush from Snap-on AC16C. fine bristle and made for cleaning aluminum. used it to clean silicone gunk from a CF blower once and didn't even mar the blower. fits in a 1/4" air die grinder
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