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04-23-2021, 02:59 PM | #1 |
Junior Member
Join Date: Oct 2014
Location: Westminster, CA
Posts: 14
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Internal engine paint
I just cleaned up an oil pump, the only debris on the screen was flakes of paint from inside the block and/or valve chamber.
What is the reason some people paint the inside of an engine? |
04-23-2021, 04:12 PM | #2 |
Senior Member
Join Date: Mar 2012
Location: Addison,ll.
Posts: 454
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Re: Internal engine paint
They generally coat the interior of block with Glyptol. It seals the pores of the cast iron and the oil remains cleaner.
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04-23-2021, 05:10 PM | #3 |
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Join Date: May 2010
Location: Oregon
Posts: 5,963
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Re: Internal engine paint
I think you ran into a poor backyard job some farmer did years ago.
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04-23-2021, 05:33 PM | #4 |
Senior Member
Join Date: Mar 2012
Location: Ohio
Posts: 1,972
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Re: Internal engine paint
I worked for a professional drag racer when I was a kid. He raced Hemi superstockers. Inside of engine block was painted with EPOXY paint, to let the oil slide off and return to the pan a little faster.
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04-23-2021, 09:01 PM | #5 | |
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Join Date: Oct 2018
Location: Glendive MT
Posts: 155
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Re: Internal engine paint
Quote:
They quit doing this because paint started peeling and clogging the pickup screen. I have not seen it done in the last 20 years. |
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04-23-2021, 09:04 PM | #6 |
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Re: Internal engine paint
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04-23-2021, 09:49 PM | #7 |
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Join Date: May 2010
Location: PASADENA, CA
Posts: 1,884
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Re: Internal engine paint
Glyptal definitely has it's place. It was very common to paint the inside of new castings to trap any sand or other debris that did not get completely cleaned from to pores of the metal.
The problem some folks have with Glyptal coming off is that the casting they are applying it to is old and has a lot of oil imbedded in the surfaces and it was not absolutely clean. Glyptal will not adhear to the surface if it is not clean and free of old grease and oil residue. Chris W. |
04-24-2021, 07:29 AM | #8 |
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Join Date: Jun 2014
Location: Land of Lincoln
Posts: 3,131
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Re: Internal engine paint
In your case I would suggest adding an oil pressure gauge, making sure you don't lose oil pressure (1-2 pounds hot).
__________________
Don't force it with a little hammer tap, tap, tap get a bigger hammer tap done |
04-24-2021, 09:53 AM | #9 |
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Join Date: Jun 2015
Location: Signal Mtn, TN (SE TN)
Posts: 2,372
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Re: Internal engine paint
How much oil could the surface retain? 1-2 oz??
I’d never do it but I’ve seen it mostly 60’s drag racers |
04-24-2021, 10:09 AM | #10 | |
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Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,516
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Re: Internal engine paint
Quote:
As Chris stated above, the coating is totally reliant on the cleaning process. Jet washing does not provide a clean base for a coating. Since many Model-A engine rebuilders do not have enough budget to do a thorough cleaning of the castings, then under those circumstances they should not use any coatings. For those that use a multistep process including thermal and soaking prior to jet washing and shot-blasting, then coatings provide a few added benefits and longevity. |
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04-25-2021, 07:25 PM | #11 |
Senior Member
Join Date: Feb 2019
Location: Erie Pa
Posts: 689
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Re: Internal engine paint
On some Hudson built cars they were red Glyptol from the factory I had a 49 with a six that was painted .
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