2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 33Get this manual

2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 33

PERIODIC MAINTENANCE VALVE CLEARANCE 3Insert the thickness gauge between the valve stem end and the valve adjusting screw on the rocker armIf the clearance is out of specification, adjust it to within the specified range
Valve clearance (when cold) IN 0.080.12 mm (0.0030.005 in) EX 0.130.17 mm (0.0050.007 in)

Thickness gauge

Adjustment
4Loosen the valve adjusting lock nut

5Turn the valve adjusting screw (2) using the valve clearance adjusting driver to bring it to within the specified range

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