Engine case/gearbox oxidised corrosion?

[dplum]

Thanks

[kevtherev]

Smoothrite silver
or any engine enamel

[Wychall]

ACF-50

It's an ultra thin anti corrosive spray that prevents corrosion on all metals, even polished. I have used it for many years to prevent corrosion on engine cases and front fork legs of motorcycles, which suffer badly when daily ridden on salt laden roads.
Gave the engine of my T3 a generous spray when I first got it and still receive comments about how clean it looks. It's an oil, not a paint, so wont flake over time.
Also very penetrative so good sprayed on the back of body seems to slow rust which is forming in there.

http://www.acf-50.co.uk/

[kevtherev]

might be using that stuff next year

[AdrianC]

http://www.safety-marine.co.uk/spages/d ... ishers.htm" onclick="window.open(this.href);return false;

There Are Three Main Types Of Dry Powder Extinguishers

1. ABC rated or multi-purpose powder, which contain ammonium phosphate
2. BC rated extinguishers, containing potassium bicarbonate or sodium bicarbonate (otherwise known as bicarbonate of soda or baking soda) Some BC rated powder fire extinguishers contain Monnex. The pressurising gas is usually nitrogen
3. A and D rated graphite powder fire extinguishers are usually used only in Class D fires

Both types of non-graphite dry powder extinguisher are potentially corrosive to soft metal such as aluminium
...
Unfortunately, the additional benefit of ABC rated dry powder fire extinguishers being able to tackle flammable gas fires also has a major drawback. Ammonium phosphate can react with any water present to form phosphoric acid, which is corrosive and can seep into even the slightest cracks in equipment.

Sounds like you're going to have to do a heck of a lot of cleaning - probably a fair bit of stripping-down - to be sure you've got everything off. I don't know if there's some kind of neutraliser which might help, likely a strongish alkali if it was an ABC. Ring the extinguisher manufacturer, mebbe?

[Oldiebut goodie]

Going by the above a liberal soaking of salt solution may well be in order to counteract the acid - or Gaviscon!

[petethefeet]

Hi,
Thats why I bought a big CO2 extingisher.

[supergalaxy]

Hammerite Thinners will clean it up treat. Just make sure you don't use a plastic brush cos it will melt.