inside dif housing cleanup

[nvrstuk]

That's why I brought attention to the word "paint"...latex is a base for paint...too many here and in other other places would hear the word "paint" and use some...not exactly the best solution...

I used to "paint" engine blocks back when it was the thing to do...

 

[ntsqd]

Yeah, the "Coatings" guy at the power plant used to foam at the mouth and start to jump up and down whenever anyone said "paint"....

 

[Skiddy]

FWIW MISF paints the insides of his diffs with POR-15. Not sure that's an ideal use of that paint, but it seems to work for him.

I suspect very few paint inside of a diff housing, but older 8" and 9" Ford diff castings & pinion carriers were painted on the inside with something very similar to the glytal if not actually glyptal. They were painted first, then machined.

we used something similar at work on castings and cylinder body's before machining as well. worked good until there was some casting sand that they painted over. some came loose on an engine frame, crank, bearings, crosshead slides all either trash or reworked. it was only about 125k oopsie

 

[ntsqd]

Supposedly the reason for pai,... er coating the inside of an iron racing engine block was to seal all of that junk so that it can't get between close tolerance parts.

"Crosshead slide", Clark RH-8A gas compressor engine or similar?

 

[Skiddy]

Supposedly the reason for pai,... er coating the inside of an iron racing engine block was to seal all of that junk so that it can't get between close tolerance parts.

"Crosshead slide", Clark RH-8A gas compressor engine or similar?

yes, very similar, superior, ajax, gemini

 

[Steve83]

It surprised me, but the powdercoater I used to use here (until he went out of bidness) was called "National Paint". (I don't consider powdercoat to be paint.)

I paint my engines, but not inside.



I paint inside the exhaust manifolds.

. .

 

[sykanr0ng]

we used something similar at work on castings and cylinder body's before machining as well. worked good until there was some casting sand that they painted over. some came loose on an engine frame, crank, bearings, crosshead slides all either trash or reworked. it was only about 125k oopsie

That seems to be a failure on the prep end, not the pa.. um, coating I meant coating.

 

[Skiddy]

That seems to be a failure on the prep end, not the pa.. um, coating I meant coating.

you know with everything it's all in the prep

 

[bronconut73]

I was told back in the 80's that guys were "coating" the inside of their blocks with that Glyptal(?) product because it was super slick and oil would flow much quicker than it would over the otherwise rough casting.

I thought that was the case up until this thread...

I didn't coat the inside of mine, as Steve83 said it just seemed too risky ....If the coating let go at some point and clogged up a lubricant necessary area....

But I do remember seeing all the magazine engine builds had that coating inside for about 20 years, then you stopped seeing it....

Was just thinking about those old Hot Rod, Car Craft, Popular Hot Rodding, Street Trucks, Popular Mechanics magz I used to read so much of in the 80's. Those writers, like Jim Allen, Steve Stillwell, Brian McCormick, Rick Peve, Christian Hazel, Granville King, and so many more taught this 80's gear head nerd Soooo much.

And yes I have made contact with a few of those printed word gear head God's, including our own Mr. Allen here at CB.
Steve and Brian were emailing Buddies of mine for a few years there.....

 

[Steve83]

...as Steve83 said it just seemed too risky ....If the coating let go at some point and clogged up a lubricant necessary area...

That wasn't me, although I agree it's a concern.

...paint sloughing off and clogging up oil flow to your bearings etc??!!

 

[sykanr0ng]

I was told back in the 80's that guys were "coating" the inside of their blocks with that Glyptal(?) product because it was super slick and oil would flow much quicker than it would over the otherwise rough casting.

I thought that was the case up until this thread...

I didn't coat the inside of mine, as Steve83 said it just seemed too risky ....If the coating let go at some point and clogged up a lubricant necessary area....

But I do remember seeing all the magazine engine builds had that coating inside for about 20 years, then you stopped seeing it....

Was just thinking about those old Hot Rod, Car Craft, Popular Hot Rodding, Street Trucks, Popular Mechanics magz I used to read so much of in the 80's. Those writers, like Jim Allen, Steve Stillwell, Brian McCormick, Rick Peve, Christian Hazel, Granville King, and so many more taught this 80's gear head nerd Soooo much.

And yes I have made contact with a few of those printed word gear head God's, including our own Mr. Allen here at CB.
Steve and Brian were emailing Buddies of mine for a few years there.....

Like you I remember seeing it done then not seeing it, but I also remember that it was around that same time when doing every shortcut possible became the normal way of doing business.
So I have wondered whether it was because it was not needed or was it considered an expense that could be cut and let the next guy worry about it not lasting as long as it should or work as well as it could?

 

[DirtDonk]

...(I don't consider powdercoat to be paint.)...

Most people probably don't. But some of the manufacturers even call it "powder paint" themselves.
The chemistries are very similar too, with epoxy, enamel, polyurethane, and others being the base chemistry. Not sure what pre-process makes one become liquid and the other powder, but I don't think it's completely without precedent to call it paint. Especially if it's in liquid form before becoming a powder.

And the act of painting is to coat something. And you can use a "coat of paint" and probably other similar descriptions. Likely as many similarities as there are differences and reasons to consider it not-a-paint.
Maybe Wikipedia knows the origins!

Paul

 

[Steve83]

[/topic]
IMO, "paint" is applied as a liquid and cures into a solid. It may cure from exposure to oxygen (most common paints), or from the loss of water (water/finger paints) or solvents (oil paints), or from an internal chemical reaction (epoxy paints).

Powdercoating is distinct in my mind because many of the powders are plastics that could never be cured on surfaces if applied as liquids - their chemistry & manufacturing process prohibits it, and they do not dissolve or otherwise liquefy when exposed to most other common chemicals. They only exist as solids in even the most-extreme natural environments, but become liquid within a specific (and relatively high) temperature range. And that's the ONLY way to get the powder to stay on the surface it was applied to - attempting to apply another adhesive material would dislodge most of the powder before the 2nd material could lock it down.

To me, that distinguishes powder in too many significant ways to lump it in with liquid "paint". But it's just my opinion.
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