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JOHNSON 2000 25HP OVERHEATING

B

big_jack

Contributing Member
"GUYS,THIS MOTOR IS STARTING T

"GUYS,THIS MOTOR IS STARTING TO OVERHEAT AT TIMES AND THE
S.L.O.W. KICKS IN. THE TELLTAIL IS SHOOTING
WATER FINE. DOES THE PUMP HAVE TO BE STRONG ENOUGH
TO UNSEAT THE THERMOSTAT SPRING? .......... I REMOVED THE HEAD-HEADCOVER AND EVERYTHING WAS
CLEAN AND THE THERMO TESTED GOOD IN BOILING WATER.
WHY IS THE WATER PASSAGEWAY SO SMALL(ABOUT 1/8 INCH SLOT) UNDER THE HEAD-HEADCOVER? I ORDERED A NEW PUMP,,,,,MANY THANKS."
 
The thermostat should open wel

The thermostat should open well below boiling point. Start opening at 145ish and be fully open at around 165 IIRC.

I belive the pump pressure should lift the thermostat against the spring at speeds above idle

BTW there is NO NEED TO SHOUT!
 
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