SAFARI

ENGINE 21 Fig. 2 Honing Of Cylinder Bores : Material to be left for honing 0.05-0.07 mm 1st Stage 2nd Stage Grit of carborundum stone 180 240 Speed of rotation (rpm) 100-120 50-60 Number of double strokes/minutes (up & down) 60 30 Stroke length (mm) 130 130 Cross hatch angle 45 0 -60 0 45 0 -60 0 Material to be left for 2nd stage honing 0.01 mm For example In order to obtain a finished liner size of 97.00 mm, bore the liner to 96.93 to 96.95 mm. Hone to 96.99 mm in first stage and finish to 97.00 mm in the second stage. Parent bore of crankshaft bearings 78.019/78.000 mm Permissible ovality of parent bore 0.01 mm Permissible taper of parent bore 0.01 mm