18 replies to this topic

[Spider]

Caustic is good, it will clean it, especially if heated but it won't de-rust it.

[Bobbins]

Caustic soda, if it's good enough for MED's blocks it's good enough for ours! 😁

Used within the coolant jacket or can a bare block be immersed in a caustic soda solution?

In one of MED's YouTube videos he says the whole block is caustic dipped after removing gallery plugs and core plugs.
Not sure what this would do to alloy bits like water pump if it was run as a temporary caustic coolant.

Thanks, I’ll take a look. My block will be fully stripped with core plugs out but I hadn’t intended to remove the gallery plugs, simply because I’ve never done that job before! Organising a suitable tank and the caustic wouldn’t be too difficult.

[84 City E]

 

 

 

I’ve just used Google to find a source of oxalic acid crystals and came across this …

“Oxalic Acid in its crystal form is now classified as a regulated poison and is no longer available for sale to the general public”

Damn, my block’s nearly fully stripped including core plugs and I did think a bath of oxalic acid might be very useful!

I didn't realise it had gone over, I did find it strange that I couldn't buy another tub. You might want to try going to a "trade" site. It's the same with paint stripper, the only stuff that isn't some form of lemon juice concoction is only sold through the trade.

Shooter

I believe its still sold as premixed 'brick acid' to the trade, relatively easily available on the usual places like amazon etc

I'm by no means a chemist but I thought brick acid was diluted sulphuric acid, another use for oxalic acid is as deck cleaner, I bought mine from an online yacht chandler.

Shooter

 

You are probably right there, but i did see a lot of cases online of people using it for block dipping/cleaning

[stoneface]

You can see a very rusty block I did in Citric Acid here https://www.theminif...zep-commercial/