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Registered
Join Date: Apr 2007
Location: wisconsin
Posts: 2,553
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Any risk to glass beading?
Getting ready to bead blast my heads...
Tried the GUNK bucket carb cleaner (Berryman equivilant), and Methylene Chloride (paint stripper)... so far, super slow to do anything... I have a bead blast/sand blast cabinet... Anything to NOT blast? I know that when I do powdercoating, bead blasting does seem to deposit some debris into soft metals, which shows up under the powdercoat... When you bead blast a head, do you avoid the mating surface to the cylinder? Assuming you don't want to machine it, as it is fine... Do you avoid the valve seat, or valve sealing area? Avoid the valve guides? My heads/valves seem to be in spec, just want to clean off the carbon... |
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08-30-2017, 04:05 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,115
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Yes, avoid any sealing surfaces as the machined/lapped finish will be compromised.
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08-30-2017, 05:10 AM
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Registered
Join Date: Apr 2016
Posts: 1,176
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You can even sand blast heads if you need to. There are no internal passages obviously so do whatever it takes to clean them, noting what Tippy said about hitting sealing surfaces. I use duct tape on the parts I don't want to blast.
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08-30-2017, 07:10 AM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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Soak the combustion chambers with brake fluid. It will dissolve the carbon. Then wash with gasoline followed by a good degreaser. If you want them shinyer, follow that with phosphoric acid (prep n prime) and a brass brush. It used to be we could get chemicals that would clean oil off of parts. Now they have to be environmentally friendly. H*ll, I can't get carb cleaner to clean the oil off my floor anymore. I digress.
Most shops bead blast since it is much faster. You need to make sure to use new beads of the correct grit. A machinist friend of mine showed me some heads someone had bead blasted and the cylinder seating surfaces were no longer smooth. They had used old beads, which were broken with sharp edges.
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage Last edited by Trackrash; 08-30-2017 at 08:27 AM.. |
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08-30-2017, 08:21 AM
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Registered
Join Date: Apr 2007
Location: wisconsin
Posts: 2,553
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Quote:
I have 2 vlaves dipped in a jar of paint remover right now. Will see what they look like when I get home. Paint remover seemed to work much better than carb cleaner in a bucket... Have never tried brake fluid... Some on here have also recommended heating in an oven and using oven-off... |
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08-30-2017, 08:51 AM
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Registered
Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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Don't use gasoline. You can die.
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08-30-2017, 09:56 AM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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Quote:
What can someone, who doesn't have a hazmat permit, buy that will clean engine parts?
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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08-30-2017, 10:16 AM
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My Garage
1971 Porsche 911
Baja Bug
