Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 8Get this manual
SPECIFICATIONS
Camshaft Dimensions IntakeExhaust "A" Bearing Diameter
1.047 in(26.59 mm) 0.550 in(13.98 mm)
CAMSHAFT
Inside Diameter of Oil Pan Bearing: CrankshaflA" Camshaft "B" B
0.985 in(25.01 mm) 0.5515 in(14.01 mm)