1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 166Get this manual

1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 166

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CYLINDER HEAD
CleaningInspectionRepair
Cylinder Head
1 Inspect the cylinder head for: Mineral depositscorrosion in the water passage ways, clean with brushround scraperCarbon deposit