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Old January 29th, 2007, 07:10 PM   #1
alltypesvw
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Default How to take paint off of a engine block???

OK I have not started on this yet because I don't have all the parts I need (like a crank or rods) at my parents house in the garage (stuff I saved from my apartment) I have an engine block from an aircooled VW. I cant remember how or when I got it but it is totally painted black. I know it was that way when I got it. I want to know if I should try to remove the paint from it? I won't do it if paint remover will just ruin it. I want to have a beautiful engine and I am willing to spend alot of time to make it pretty. so if I can polish it I want to know how you would suggest or if doing that just would mess it up some other way. Help me out here!
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Old January 29th, 2007, 07:31 PM   #2
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Default Re: How to take paint off of a engine block???

bead blasting?
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Old January 29th, 2007, 07:42 PM   #3
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Default Re: How to take paint off of a engine block???

have it vated
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Old January 29th, 2007, 07:46 PM   #4
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Default Re: How to take paint off of a engine block???

Type 1 motor ?
I think they are Magnesium.
Many chemicals that will remove paint are hard on Magnesium.

If it's solid,I'd try Lacquer Thinner.
With lots of ventilation,and ideally a respirator.

If that didn't help,you can do a LOTS and LOTS of scraping and sanding,
or scuff it and paint over it.
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Old January 29th, 2007, 07:50 PM   #5
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Default Re: How to take paint off of a engine block???

As Squreback said have it vated But as for polishing it ??? polishing is just like painting it it will not breath and hold in alot of heat !!! Good for show not for go !! your choice my 2 sence.
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Old January 29th, 2007, 08:31 PM   #6
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Default Re: How to take paint off of a engine block???

ez off oven cleaner? ... brake fluid?
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Old January 29th, 2007, 08:35 PM   #7
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Default Re: How to take paint off of a engine block???

The Lye in Oven Cleaer will corrode Aluminum,and Magnesium.
You definately wouldn't want it soaking over night.

Don't know about Brake Fluid on Aluminum or magnesium.
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Old January 29th, 2007, 08:38 PM   #8
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Default Re: How to take paint off of a engine block???

i know i use brake fluid for stripping paint off of plastic model car bodies and metal model car bodies .. (pot metal?)
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Old January 29th, 2007, 09:03 PM   #9
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Default Re: How to take paint off of a engine block???

Magnesium can be pourous.Any chemicals trapped in the pours
will react with any paint put on over top.

Common problem with old Corvettes.
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Old January 29th, 2007, 10:47 PM   #10
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Default Re: How to take paint off of a engine block???

The Magnesium cases are infact all porous. Painting them aren't that good of an idea in the first place. Possibly would work on a brand new case though..

The thing is that a used case allways have oil trapped in the porosity, which will make the paint to peal off...

Dipping the Magnesium cases (and Aluminium) into any Basic or Acidic cleaners etc. is a BIG NO-NO!! If you leave them over night you wouldn't have anything else left in the basin than all the steel bolts etc. on the bottom....

Beadblasting is good if you can make sure that you get all the grains out of the oilchannels etc. (No matter how you do it there will go some inside the case too...)

Other would possibly be Thinner or simply scraping it off and then rubb the surface to semigloss..
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Old January 30th, 2007, 07:31 AM   #11
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Default Re: How to take paint off of a engine block???

check the yellow pages for soda blasting. it's what sounds like, baking soda. it only leaves a fine powder on your block that is easely rinsed with water. I let mine soak in a tub of water overnight a blew it dry with an air nose the next day. Regardless of what you use and if you are doing a complete overhaul as I did, change your oil after a 2000 - 2500 RPM 20 min. break in.
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Old January 30th, 2007, 09:28 AM   #12
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Default Re: How to take paint off of a engine block???

check the yellow pages for soda blasting. it's what sounds like, baking soda. it only leaves a fine powder on your block that is easely rinsed with water. I let mine soak in a tub of water overnight a blew it dry with an air nose the next day. Regardless of what you use and if you are doing a complete overhaul as I did, change your oil after a 2000 - 2500 RPM 20 min. break in.
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Old January 30th, 2007, 11:01 AM   #13
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Default Re: How to take paint off of a engine block???

I've also heard of places using crushed walnut shells as a blasting media, it's used on fiberglass so I'd think it would be ok on magnesium.

Then again, I could be an idiot and be wrong.
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Old January 30th, 2007, 02:31 PM   #14
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Default Re: How to take paint off of a engine block???

well I was most concerned about the spots where the cylenders seat. thanks for the good suggestions. I think if I can find a place to do it I will have the block soda blasted. I just would like to have a clean block to rebuild. I know the cylenders and pistons I have are not really good neither are the dellorto carburators I have. but free is free so I can't complain about that
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Old January 30th, 2007, 03:28 PM   #15
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Default Re: How to take paint off of a engine block???

I have used easy off oven cleaner on a couple of engines. Just spray it on wait an hour or so pressure wash the snot out of it and you'l be fine. If the case is really old and pourous , I would scrape and sand it.
Blasting works fine with the right media-NO SAND- too much heat is created and you may have a hell of a fire on your hands!
Dont ask how I know........but I know for sure!
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