Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 151Get this manual
CYLINDER BLOCK AND CRANKCASE
Measuring Clearance Between Inner and Outer Rotors "A"
Standard Value
0.006 in(0.15 mm) or less Out of the Limit If 0.008 in(0.20 mm) or more requires replacement
Measure Clearance Between Outer Rotor and BodyB"
Standard Value
0.0050.008 in(0.120.20 mm)
Out of the Limit
If 0.010 in(0.25 mm) or more requires replacement
Measuring Height of Oil Pump Outer Rotor