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Electrolysis for 500 stove burner/bottom plate?

Posted: Mon May 03, 2021 9:04 pm
by Bob1774
Working on cleaning up a '40 A 500 Speedmaster (first year production).

The fount and ring cleaned up nicely, but the dang screws holding the cast iron burner rings together are just plain frozen, even after weeks of Kroil and PB Blaster, as are the screws that hold the burner to the bottom plate.

I'm thinking of just dunking the entire piece and using electrolysis to clean everything up.

It appears the bottom plate has a lot of original coating, but under 80 years of crud. Thought it might clean up like doing a cast iron skillet.

Any thoughts?

Re: Electrolysis for 500 stove burner/bottom plate?

Posted: Tue May 04, 2021 2:00 am
by Gunhippie
500 bottom plate was painted. Depending on CA or US and years, black or silver.

I've used electrolysis for a lot of things, but never for freeing a stuck screw or bolt. Let us know how that works out!

For crappy greasy stuff, I use lye for my electrolyte. Works wonders but strips paint.

If your fount is nickel-plated, the electrolysis won't hurt that at all. If it's painted, you'll likely be re-painting.

Re: Electrolysis for 500 stove burner/bottom plate?

Posted: Tue May 04, 2021 11:57 am
by Bob1774
Timm,
Thanks for the suggestions. I'm going to go slow, and use the least aggressive steps first. Using some orange cleaner to degrease the plate, then perhaps electrolysis if the paint is already gone.
If those screws break loose after electrolysis, then that would be a bonus. I was just trying to clean the cast iron while still attached to the plate. Fount is off and already shined up nicely. I'll get some photos up later.

Re: Electrolysis for 500 stove burner/bottom plate?

Posted: Tue May 04, 2021 10:00 pm
by Gunhippie
Ah, those screws that hold the burner to the base plate can be a b****. I rebuilt and repainted my 500A without removing them.

If you find any tiny scraps of silver paint on the base plate or burner, Rustoleum High Temp Flat Silver 2,000F is a very good choice. It'll even hold up pretty well on the grate.

Image

That's after a lot of use. Keeping a pot on the grate really helps to cool it--it gets bright red if running with nothing on it.

You can also see that I replaced all the screws I was able to get out with brass. Those will never rust into place.