2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 125Get this manual

2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 125

POWER UNIT INSPECTIONSERVICING
Valve Head Thickness
Measure: Valve head thickness

Vernier calipers

Valve head thickness Service limit: IN and EX 0.5 mm (0.02 in) If exceed service limitReplace

Valve Seat Width
Measure: Width of seat contact 1Coat valve seat evenly with Prussian blue (or equivalent)2Install the valve into cylinder head3Put the valve lapper on valve
Valve lapper

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