2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 122Get this manual
POWER UNIT INSPECTIONSERVICING
Camshaft Journal Oil Clearance
Measure: !Tioti Camshaft holder inside diameter (Upper side) Camshaft journal outside diameter (Upper side) Camshaft holder inside diameter (Lower side) Camshaft journal outside diameter (Lower side) Micrometer Dial calipers Camshaft holder inside diameter (Upper side) Standard: 25.00025.021 mm (0.98430.9851 in) Camshaft journal outside diameter (Upper side) Standard: 24.95924.980 mm (0.98260.9835 in) Camshaft holder inside diameter (Lower side) Standard: 23.00023.021 mm (0.90550.9063 in) Camshaft journal outside diameter (Lower side) Standard: 22.95922.980 mm (0.90390.9047 in) Oil clearance Standard: 0.0200.062 mm (0.00080.0024 in) Service limit: 0.100 mm (0.0039 in) If exceed service limitReplace: Cylinder head andor Oil pump galley andor Camshaft