2006 Johnson SD 30 HP 4 Stroke Outboards Service Repair Manual, PN 5006592, Page 140Get this manual

2006 Johnson SD 30 HP 4 Stroke Outboards Service Repair Manual, PN 5006592, Page 140

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POWERHEAD CYLINDER HEAD

Check the water jackets for clogs or obstructions12

Use straightedge and thickness gauge to measure the cylinder head distortion on the gasket surface