Chrysler 75 and 85 HP Outboards Service Manual OB 3646, Page 134Get this manual
CResurface cylinder headif it is only slightly warpedlay sheet of No 120 emery cloth on the glass and slide cover around in figure motionexerting light and even pressure DExamine gasket surface area: high spots will be dull, low spots unchangedContinue until entire gasket surface has dull finish Finish off with No180 emery cloth Figure 30 CInspect reed plate screens
Figure 30Resurfacing Cylinder Head
Figure 32Inspecting Cylinder Drain Screens
6Inspect and disassemble cylinder drain reed plate as follows :
DRemove fitting from cover7Inspect and repair cylinder block and crankcase as followsAMeasure the cylinder bores at three points with an inside micrometer or dial indicatorMeasure 1 4" (6.35 mm) down from top, 1 4" (6 .35 mm) up from exhaust port and about 316" (4 .76 mm) down from lower edge of intake portFigure 33Take measurements again at 1 turn from first set