Painting inside the differential

[mrblaine]

Casting issue/roughness/inconsistencies and to fight porosity.

Someone should send a few drums of it to Tera. I've seen more than a few of their Tera low castings weep trans fluid through the casting due to porosity.

 

[kmas0n]

It’s not just that differential.
It’s two others, both being 14 bolts.

View attachment 68734

View attachment 68735

I mean. it does look nice.

 

[K0LCB]

It’s not just that differential.
It’s two others, both being 14 bolts.

View attachment 68734

View attachment 68735

I think someone found a rattle can of red paint, JMHO

 

[astjp2]

I have a gallon on a table in my shop, it is also used to insulate alternator/starter and generator windings, its that red shit that you can see through the castings on some models, new ones may have been put under a vacuum with hot varnish to get the bubbles out then baked at 250 for 12 hours. I am using it on my lathe rebuild and it was used on the inside of airplane engines to aide in oil flow and some think what was cooling.

 

[chino1969]

:roflmao:
Loving the replies.

Everyone seems to have an opinion and assumption on the subject. But nobody can name the coating/paint or point you in the right direction to find more info on it...

Ive heard old automotive engineers talk about Glyptal resins and paints in rear ends and engine internals. Its used to promote oil circulation and knock down rough castings in the diff. It’s still used inside hydraulic chambers today. Does it have a benefit in newer differentials? Probably not. Is it worth it? One could easily argue, no. Gale Banks talks about is somewhere, just cand find it.
https://www.hisco.com/Catalog/Paints-Coatings/Paints-Primers/Enamel-Paints/1201G-21717

Ford drivetrain and axle engineers used it in 9 inch rear axle applications like it was going out of fashion back when they were still manufactured. :eaea:

Metal technology has come a long way since the early Ford 9 days. Apparently it was to used to fight the inconsistency in metal’s porosity back in the day. Hard to find actual back and white data on that though.

But know that its not just some dumb hillbilly painting the inside of his 14bolt to look cool. It originally was the solution to an engineer’s design requirements as most of my run ins with it have been factory applications.

You beat me to the punch line. Looks like Glyptal to me which, more than likely, was done at the factory for the reasons you mentioned.

 

[Fouledplugs]

I think someone found a rattle can of red paint, JMHO

Check post #9

 

[jjvw]

Check post #9

We solved the mystery a second time, guys! Twice in one thread.

 

[Fouledplugs]

We solved the mystery a second time, guys! Twice in one thread.

Brought back to life just for that fact.

 

[Vinman]

A brightly painted diff interior could help when washing out dirty or contaminated fluid. The bright colour will make it easier to see any crud in the hard to reach places.

 

[astjp2]

Someone should send a few drums of it to Tera. I've seen more than a few of their Tera low castings weep trans fluid through the casting due to porosity.

Chinese quality there...

 

[Paparock1]

All it needs is a clear diff cover

https://www.ebay.com/i/202448445521?chn=ps