CYLINDERS Inspection & Resizing Bore Section 11 CYLINDERS & BEARINGS INSPECTION All Models Always  inspect  the  cylinder  after  the  engine  has  been disassembled.    Visual  inspection  will  show  if  there  are any   cracks,   stripped   bolt   holes,   broken   fins   or   if   the cylinder wall is damaged.  Use a telescoping gauge and dial indicator or inside micrometer to determine  the  size of the cylinder bore.  Measure at right angles.  See Fig. 1.  Table No.  1 lists the standard cylinder bore sizes. If the cylinder bore is more than .003" (.08 mm) oversize, or .0015" (.04 mm) out of round on cast iron cylinders, or .0025" (.06 mm) out of  round  on  lightweight  cylinders,  it must be resized. Fig.  1 - Check Cylinder Bore NOTE:   Do   not   deglaze   cylinder   walls   when   installing piston rings in aluminum cylinder engines. NOTE: Chrome ring sets are available for most models. See Bulletin #479 or Illustrated Parts List.  They are used to  control  oil  consumption  in  bores  worn  to  .005"  (.13 mm)  over  standard  and  do  not  require  honing  or  glaze breaking the bore to seat. RESIZING Resize Cylinder Bore to Next Oversize All Models ALWAYS RESIZE TO EXACTLY .010" (.25 mm) or .020" (.51  mm),  or  .030"  (.76  mm)  OVER  STANDARD  SIZE AS   SHOWN   IN   TABLE   NO.      1.      IF   THIS   IS   DONE ACCURATELY,  THE  STOCK  OVERSIZE  RINGS  AND PISTONS     WILL     FIT     PERFECTLY     AND     PROPER CLEARANCES    WILL    BE    MAINTAINED.        Cylinders, either cast iron or aluminum, can be quickly resized with a  good  hone  such  as  Briggs  &  Stratton  part  #19205  for aluminum     cylinders     or     part     #19211     for     cast     iron cylinders.      Contact   your   Briggs   &   Stratton   source   of supply.  Use the stones and lubrication recommended by the  hone  manufacturers  for  the  various  engine  models, to produce the correct cylinder wall finish. TABLE NO.  1 BASIC ENGINE MODEL STANDARD BORE SIZE OR SERIES DIAMETER MAX MIN. ALUMINUM CYLINDER Milli- Milli- ‘ Inches Meter Inches Meter B, 60000 before 2.3125 58.74 2.3115 58.71 Ser #5810060 60000 after 2.3750 60.33 2.3740 60.30 Ser #5810030 8B, 80000 82000 2.3750 60.33 2.3740 60.30 92000, 93000, 94000 2.5625 65.09 2.5615 65.06 100000 2.5000 63.50 2.4990 63.47 110000 2.7812 70.64 2.7802 70.62 130000 2.5625 65.09 2.5615 65.06 140000 2.7500 69.85 2.7490 69.82 170000, 190000 3.0000 76.20 2.9990 76.17 220000, 250000 3.4375 87.31 3.4365 87.29 (Table No.1 - Cast Iron Cylinders continued on page 2.) JUNE 1981