2005 SO Johnson 4 Stroke 9.9-15HP Outboards Service Manual, Page 49Get this manual
MAINTENANCE COOLING SYSTEM
COOLING SYSTEM
Check the condition of cooling system components regularlyThe outboard cooling system consists of: water intake screens overboard water pressure indicator water pump all internal water passages thermostat
water pump indicatorIf it does not, shut off the outboard and repair as neededShut OFF the outboardLeave the outboard in VERTICAL (DOWN) position long enough for the water to drain from the powerhead completely
Flushing
Flush the outboard with fresh water following each use in brackish, salt, or polluted water to minimize the accumulation of scale and silt deposits in cooling system passages1Water pump indicator
WARNING
Prevent injury from contact with rotating propeller; remove the propeller before flushing