Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 153Get this manual
CleaningInspectionRepair Cylinder Bore
MEASURING CYLINDER BORE 1Measure the cylinder bore diameter "d" at three locations in both and axis2If the cylinder bore is beyond the limits listed in the tables below, it will be necessary to rebore the cylinder to accept the next oversize piston
MEASURING PISTON 1Measure the piston at point 0.4 in (10 mm) from the bottom
aPiston Diameter0.4 in(10 mm)
Cylinder Bore Specifications Diameter (Standard) Bore Wear Limit Taper or Out-of-Round Maximum Limit Diameter 0.010 in(0.254mm) Oversize Bore Wear Limit Taper or Out-of-Round Maximum Limit Diameter 0.020 in(0.508mm) Oversize Bore Wear Limit Taper or Out-of-Round Maximum Limit 2.3232.324 in(59.0059.02 mm) 2.326 in(59.1 mm) 0.003 in(0.08 mm) Standard