Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 148Get this manual
CYLINDER BLOC AND CRANKCASE
Measuring Camshaft Lobe HeightA" IntakeExhaust
Standard Value Out of the Limit 1.037 in(26.33 mm) or less requires replacement
1.047 in(26.59 mm)
Measuring Camshaft Bearing DiameterB"
Standard Value
Out of the Limit
0.549 in(13.95 mm) or less requires replacement
0.550 in(13.98 mm)
Measuring Inside Diameter of Oil Pan BearingCrankshaft