2005 SO Johnson 4 Stroke 9.9-15HP Outboards Service Manual, Page 144Get this manual
POWERHEAD CYLINDER HEAD ASSEMBLY Rocker ArmShaft Inspect the cam-riding face and tip of the adjusting screwIf excessive wear is foundreplace the rocker arm andor adjusting screw
ValveNalve Guide To check valve guide to valve stem clearancemeasure the followingValve stem outside diameter Valve guide inside diameter
Valve stem outside diameter: IN 0.2156 to 0.2161 in(5.475 to 5.490 mm) EX 0.2146 to 0.2152 in (5.450 to 5.465 mm) Valve guide inside diameter: IN 0.2165 to 0.2170 in(5.500 to 5.512 mm) EX 0.2165 to 0.2170 in(5.500 to 5.512 mm)
To check rocker arm to shaft clearance, measure the following: Rocker arm shaft outside diameter Rocker arm inside diameter Rocker arm shaft outside diameter: 0.5107 to 0.5112 in (12.973 to 12.984 mm) Rocker arm inside diameter: 0.5118 to 0.5125 in(13.000 to 13.018 mm) Rocker arm to shaft clearance: Standard: 0.0006 to 0.0018 in (0.016 to 0.045 mm) Service limit: 0.0024 in(0.060 mm)