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Acid Dipping A Block


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#1 JonnyAlpha

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Posted 12 May 2019 - 08:43 PM

Hi,

I need to get a 1275 block cleaned before getting machining work done. I have found a guy who does shot blasting and has an acid tank but only usually does alloy wheels.
He has said that the acid strip is methalyne chroride with hydrofluric acid in it. Is this ok for a cast mini engine block?
Thanks

#2 whistler

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Posted 12 May 2019 - 09:15 PM

Your machine shop probably has a dip tank.



#3 unburntfuelinthemorning

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Posted 12 May 2019 - 09:34 PM

Or they can send it somewhere that does. 



#4 mini_in_progress

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Posted 12 May 2019 - 10:08 PM

As long as theres no copper, brass or alloy attached it would be fine, once its out and washed off it will begin to rust unless he has a inhibitor tank too. Or you oil coat it....but thats counter productive if you want to paint it.

#5 nicklouse

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Posted 12 May 2019 - 10:13 PM

should be fine.will need neutralising after or it will effect the paint.



#6 Moke Spider

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Posted 13 May 2019 - 12:14 AM

 the acid strip is methalyne chroride with hydrofluric acid in it. Is this ok for a cast mini engine block?

 

I won't hurt the block or anything in it, but equally I don't think it will do the job you want.

 

Phosphoric Acid is one type of Acid for what you want, though, if it's greasy and 'yukky' you might want to put it through a Caustic Bath first, rinse it a zillion times, them do the Acid treatment.



#7 mini_in_progress

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Posted 13 May 2019 - 05:55 AM

Phosphoric acid would remove rust only not paint.

#8 JonnyAlpha

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Posted 13 May 2019 - 06:33 AM

Ok thanks for the info.
My chosen machine shop, old school, has s parts washer (sort of dis washer) but does not acid dip, nor does he send anything away.
The engine has been sat idle for about 15 years so I want to mainly ensure the oil galleries are clear and that the water ways are rust free.

#9 nicklouse

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Posted 13 May 2019 - 07:28 AM

Ok thanks for the info.
My chosen machine shop, old school, has s parts washer (sort of dis washer) but does not acid dip, nor does he send anything away.
The engine has been sat idle for about 15 years so I want to mainly ensure the oil galleries are clear and that the water ways are rust free.

that will do the job. and the plugs for all the oil and water ways should be remove before then scrubbed and washed again and then checked. and then washed again after all machining.






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