We have a large kiln we can heat the blocks in. Heat to 250 degrees for an hour. Remove block and the sleeves fall out onto the floor. Sometimes just a hot jet wash will do the trick. I have also seen people use a torpedo heater. To install the sleeves we heat the block to 250 degrees and use a Coleman cooler that can hold eight sleeves standing on end and fill the sleeves with dry ice pellets. Costs about $25. Leave in cooler for ½ hour. Wear welding gloves and the sleeves just drop into the block even if it’s an iron block. Doesn’t distort other cylinders. No sledge hammers required.
Ray Barton