TM  10-3930-638-24&P 4-2.   ENGINE   MAINTENANCE   (cont) a. Cylinder Block Assembly (cont). STEP LOCATION ITEM ACTION REMARKS INSPECTION   (cont) c. Measure cylin- Check  taper  and  out-of-roundness  with (cont) der  sleeve bore gauge. If taper or out-of-roundness bores exceeds 0.002 inch, replace block 9 Cylinder  sleeve  (1) a. Inspect Replace if smooth, shiny surface along complete  length  or  heavy  vertical  lines fringed  by  metal  transferring  from  one spot  to  another  are  observed WARNING Blue Vitriol solution contains acid. Wear safety glasses to protect eyes from accidental splashing and avoid splashing solution on skin. If solution is splashed on your skin or in your eyes, wash off immediately with water and get medical aid. b.  Check  chrome Wet inside of sleeve with cotton swab plating saturated with Blue Vitriol solution. If bright copper color is observed, replace sleeve.  Rinse  tested  surfaces  with  water after  check NOTE If Blue Vitriol solution cannot be obtained from druggist, a satis- ‘ factory solution can be made from copper sulfate crystals avail- able at hobby stores or pharmacies. To prepare solution: add one tablespoon fresh battery acid to one cup water; add 1/2 level teaspoon copper sulfate crystals to solution; stir with plastic spoon until crystals are dissolved. c. Check sleeve Use inside micrometer or bore gage. Check inside diameter below top ring location and at several for  taper points down length. Replace if taper is more than 0.002 inch d. Check sleeve Use bore gage. Measure lengthwise just be- out-of-round- low top ring location at four points 90 ness degrees from each other. Replace if out- of-roundness exceeds 0.001 inch. (Use micrometer to check bore gage.) 10 Oil falter to block Inspect Replace if bent or threads damaged adapter  (5)  and stud (3) 4-6