CYLINDERSResizing BoreTABLE NO. 1 (Cont’d.)BASIC ENGINE MODEL STANDARD BORE SIZEOR SERIES DIAMETERMAXMIN.ALUMINUM CYLINDER Milli-Milli-‘InchesMeterInchesMeter5, 5S, 6, N2.0000 50.80 1.999050.7782.2500 57.15 2.249057.1292.2500 57.15 2.249057.12142.6250 66.68 2.624066.6519, 23, 190000, 2000003.000076.202.999076.172300003.0000 76.20 2.999076.172400003.0625 77.79 3.061577.763000003.4375 87.31 3.436587.293200003.5625 90.49 3.561590.46If a boring bar is used, a hone must be used after theboring operation to produce the proper cylinder wallfinish.Honing can be done with a portable electric drill, but it iseasier to use a drill press.To Set Up For HoningClean cylinder at top and bottom to remove burrs andpieces of base and head gaskets.Fig. 2 - Honing Cylinder(See page 8 for enlarged drawing.)Fasten cylinder to a heavy iron bracket or use honingplate. Fig. 2. Some cylinders require shims. Use alevel to align drill press spindle with bore.Oil surface of drill press table liberally. Set plate andcylinder on drill press table. (Do not anchor to drill presstable.) If using portable drill, set plate and cylinder onfloor. Place hone drive shaft in chuck of drill or portabledrill.Slip hone into cylinder; Fig. 2, Illus. 2. Connect driveshaft to hone and set stop on drill press so hone can onlyextend 3/4" (20.0 mm) to 1" (25.0 mm) from top orbottom of cylinder. If using a portable drill, cut a woodblock to place inside of cylinder as a stop for home.
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