2006 Johnson SD 30 HP 4 Stroke Outboards Service Manual, PN 5006592, Page 171Get this manual

2006 Johnson SD 30 HP 4 Stroke Outboards Service Manual, PN 5006592, Page 171

POWERHEAD OPERATION
OPERATION
Water Cooling System
The water cooling system includes the water pump, the water supply tube, the water pressure valve, the powerhead water passages, and the thermostatThis system cools both the powerhead and the midsectionIf overheating occurs, the components of the cooling system must be inspected for blockage, corrosion buildup, or damageRETURN HOSE When open

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