Author Topic: How to clean engine for paint  (Read 20141 times)

Offline 9511234

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How to clean engine for paint
« on: October 01, 2011, 10:08:41 am »
I have the engine out on a stand, intake and pan dropped.  The heads are still on.

What's the best way to clean it up for spray painting some color on the block and heads?

I don't want anything too corrosive that might damage seals, obviously don't want to use water or a liquid that could get in the bottom end of the engine.  I had the pan vat cleaned at the engine shop.

If I took it there is there a process there they could use to clean it without taking the heads off or with the block and rotating assembly in place?
Primarily trying to get grease/sludge off the outside.  There's a little bit of rust, but nothing the paint shouldn't be able to handle.
Thanks for the help.

Offline bake74

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Re: How to clean engine for paint
« Reply #1 on: October 01, 2011, 10:49:38 am »
     If it is on a rotating engine stand, I would use a degreaser sparingly, one side at a time with a brush and small wire brushes, rotate the engine so you can clean the down side and keep turning, or put your pan back on, and cover (plastic)the other area's and then clean with a solution so as to get the grease off so your paint will stick.  Are you painting or coating it with something like por-15.
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Offline mach1mustang351

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Re: How to clean engine for paint
« Reply #2 on: October 01, 2011, 10:26:16 pm »
Degreaser works well.  I also use some brake clean or mineral spirits because they tend to remove the degreaser helping the paint stick.  Blowing everything off with compressed air helps well too.  Keep the engine inside and warm and make sure the paint can is warm.  It tends to flow better out of the can, in my experience.   

Offline roadrage41

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Re: How to clean engine for paint
« Reply #3 on: October 02, 2011, 01:15:45 am »
make sure the engine as a whole is sealed up, mini wire wheels and compressed air, little bit of brake clean and a scotch brite here and there.
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Offline Blazin

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Re: How to clean engine for paint
« Reply #4 on: October 02, 2011, 10:36:34 am »
I use all of the above methods, and also Aircraft Paint Stripper. You will need to be careful not to get it on rubber, and your hands. Once the heavy grime is gone with degreasers and a presure washer. the stripper will take off all the old paint. I presure wash the striper off. Then I wire brush, use a mini grinder with scoth brite wheels, and 36 grit wheels. Also use a 3" DA sander to prep it, and a blow gun. For the rusty areas I use Chassis Saver, and the clean metal areas I use a spray bomb self etching primer
( Transtar brand is a good one ). Then paint with a quality top coat.
Few pics of the last one I did.












In the truck.


« Last Edit: October 02, 2011, 08:35:10 pm by Blazin »
Some people are like Slinkies. Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs

Offline bake74

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Re: How to clean engine for paint
« Reply #5 on: October 02, 2011, 03:49:20 pm »
     Hey blazin, is that cat yellow paint.   ;D
#1: The easiest and most obvious solution to any problem is 99% of the time correct.
#2: There is no such thing as impossible, it just takes longer.
  74 k10, 77k10    Tom

Offline Blazin

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Re: How to clean engine for paint
« Reply #6 on: October 02, 2011, 04:09:43 pm »
Why yes, it is. Thanks for noticing!! Meoow!!   ;D
Some people are like Slinkies. Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs

Offline Bitzer!

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Re: How to clean engine for paint
« Reply #7 on: October 23, 2011, 04:53:33 pm »

Hi guys, I don't have access to "cack" paint  ;D

Once it's cleaned and etched, would normal 2k paint survive the heat?

I've heard several stories blah blah only use enamals etc?

cheers
1979 GMC CrewCab  C20 1t
454 750 Holley,TH350, 14bolt diff fully floating
Why aren't there 8 days in a week!
A K5 rolling shell *new addition*

Offline VileZambonie

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Offline Bitzer!

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Re: How to clean engine for paint
« Reply #9 on: October 23, 2011, 05:25:03 pm »
 ;) cheers Vile. Next to decide the colour!
1979 GMC CrewCab  C20 1t
454 750 Holley,TH350, 14bolt diff fully floating
Why aren't there 8 days in a week!
A K5 rolling shell *new addition*

Offline VileZambonie

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Re: How to clean engine for paint
« Reply #10 on: October 23, 2011, 05:45:38 pm »
What color is the truck?
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              ⌠ŻŻŻŻŻ'   [☼===☼]
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Bitzer!

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Re: How to clean engine for paint
« Reply #11 on: October 23, 2011, 06:14:19 pm »

You mean you haven't been following  ::)

Orange with black roof & black strip down sides.

Thinking orange inner fenders and a black & silver engine?
1979 GMC CrewCab  C20 1t
454 750 Holley,TH350, 14bolt diff fully floating
Why aren't there 8 days in a week!
A K5 rolling shell *new addition*

Offline VileZambonie

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Re: How to clean engine for paint
« Reply #12 on: October 23, 2011, 06:38:21 pm »
Wasn't sure that's what you are working on here but yeah black looks nice
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              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Bitzer!

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Re: How to clean engine for paint
« Reply #13 on: October 24, 2011, 09:38:42 am »

It was either black/silver or silver/black. Can't think of many other colours that would compliment the orange!
1979 GMC CrewCab  C20 1t
454 750 Holley,TH350, 14bolt diff fully floating
Why aren't there 8 days in a week!
A K5 rolling shell *new addition*

Offline Blazin

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Re: How to clean engine for paint
« Reply #14 on: October 24, 2011, 11:01:42 pm »
Why not black and orange?
Some people are like Slinkies. Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs