Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 149Get this manual
CYLINDER BLOCK AND CRANKCASE
Measuring Inside Diameter of Oil Pan BearingCamshaft
Standard Value Out of the Limit Depends of clearance
0.5515 in(14.01 mm)
Clearance Between the Oil Pan Bearing and Camshaft
Standard Value Out of the Limit If 0.0028 in(0 .07 mm) or more requires replacement
0.00080.002 in(0.020.05 mm)