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#1
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Cleanup of mating surfaces...
I am about to reinstall a completely cleaned up intake manifold (1989 560 SEL). I noticed a lot of residue on the mating surfaces of the cylinder heads.
My plan for now to cleaning this up is using acetone as a solvent, but I am looking forward to any other suggestions. What have others done before bolting the manifold back in with the new gaskets?
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Henry Bofinger 1989 560 SEL (black/black) 2001 Audi TT Roadster (silver/grey) |
#2
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What's the residue? If it's old gasket material, soaking with Permatex Gasket Remover and then using a plastic scraper (sometimes a few soak-and-scrape cycles if there's a lot of material) often works wonders.
Permatex® Gasket Remover |
#3
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Thank you!
Quote:
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Henry Bofinger 1989 560 SEL (black/black) 2001 Audi TT Roadster (silver/grey) |
#4
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The Permatex Gasket Remover won't melt silicone / RTV, but it works well on old-school paper and solvent-based sealers. If you can find a can of the old (high VOC) Permatex spray, it probably works even better than the new low-VOC stuff. https://youtu.be/iF2my-oganM
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#5
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In that case acetone migh be the right answer after all
I think I will be scrubbing there for a while...
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Henry Bofinger 1989 560 SEL (black/black) 2001 Audi TT Roadster (silver/grey) |
#6
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I recently bought a carbide scraper, it is simply amazing, just drag it on the surface and the gasket debris simply peels away with it. Finish off with a solvent cleanup, cuts time by as much as 10x.
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2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017) |
#7
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^ Great tip for steel or iron parts! Just don't use a carbide or steel scraper on aluminum, it's too easy to damage the machined surface.
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Event Video: Cars & Coffee 2023, Simi Valley CA: https://youtu.be/CFfY9CPVuEs URO Parts online catalog: https://apaindustries.com/catalog Last edited by URO Parts Support; 08-13-2019 at 12:27 PM. |
#8
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Sometimes a slightly dulled putty knife would work. A perfectly sharp one may gouge into the aluminum.
Finish with a scotchbrite pad. |
#9
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Quote:
Scraping Tool | Super Scraper | Carbide Processors Just lay it on the aluminium surface and pull towards yourself, it lifts out any gasket, then finish with a solvent or if fine polishing is required a silicon carbide sponge of 3000 or 4000 grit can make it shiny as a mirror. A soft brass brush is also a good tool to finish off as it doesnt change the surface characteristics of the item being worked on. Of course proper common sense is required when using. Before this I used to use smashed copper pipe to act like a scraper, its soft, but takes longer. In half cases I still have to use the copper pipes - when the area is very small
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2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017) |
#10
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scotchbrite is very bad on an engine surface unless you are going to flush the object clean with cleaning surfactants.
__________________
2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017) |
#11
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Quote:
__________________
Event Video: Cars & Coffee 2023, Simi Valley CA: https://youtu.be/CFfY9CPVuEs URO Parts online catalog: https://apaindustries.com/catalog |
#12
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I've got very thin residue, it will not scrape off, I've tried a plastic scraper. It is super thin. Unfortunately, the Permatex gasket remover is pretty useless against this stuff, and the acetone takes a lot of effort too. Any other chemical suggestions?
__________________
Henry Bofinger 1989 560 SEL (black/black) 2001 Audi TT Roadster (silver/grey) |
#13
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Or should I just leave it and pray the new gasket will seal over the old residue?
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Henry Bofinger 1989 560 SEL (black/black) 2001 Audi TT Roadster (silver/grey) Last edited by hbofinger; 08-13-2019 at 06:26 PM. |
#14
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find a scrapped copper pipe and smash it to an edge, then sharpen it a bit - use that to scrape it. Copper is a bit softer and wont hurt the aluminum if you are sort of gentle on it.
__________________
2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017) |
#15
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Never tried one, but brass scrapers and putty knives are available. Looks like copper and brass are similar in hardness, with copper being a bit softer.
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Event Video: Cars & Coffee 2023, Simi Valley CA: https://youtu.be/CFfY9CPVuEs URO Parts online catalog: https://apaindustries.com/catalog |
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