cleaning a block on the inside

[Pete]

Originally Posted by JSeery

Acid cleaning would be great for rust, but will it do anything to remove the casting sand Pete? I'm asking because all I have ever done is the normal hot tank cleaning and it does nothing to remove the casting material. My current block has had a least one previous rebuild and after I took it apart and hot tank and water pressure cleaned it there was still an unbelievable amount of crud around the rear cylinders. Should have taken a photo of the pile of sand and other crud that came out of the thing!

Yes, it removes sand. When you get the block back it is bare metal everywhere. There is no residue.

The acid used is a combination of several.