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Outboard overheating telltale water very hot within minutes of start

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You have a failed head gasket or sacrifice plate in the exhaust system that is allowing compression or exhaust gas directly into the cooling water.

Posted on Aug 07, 2013

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I have a YAMAHA 225 FOUR STROKE OUTBOARD. WATER PUMPS OUT TELLTALE WHEN ENGINE IS RUNNING, BUT WHEN CONNECTED TO A HOSE FOR FLUSH OUT NO WATER COMES OUT THE TELLTALE.


If you telltale operates under normal conditions, I take it you have the tap on, muffs over the inlet
and engine running, have you checked the muffs are on the correct way round, is water passing through the inlet vanes, is it passing through the hose pipe? If you have checked these and all is good, and still no tell tale then run the engine in a drum filled with water. If still nothing or the telltale is weak then your impeller is on the way out.

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check for water coolant circulation. either you might have a clogged radiator or faulty water pump. to check the radiator after you run the engine for a while switch it off and try to find an easy access to radiator vents and touch all surface to see whether is all ho or if is some,then you remove it and send it for cleaning. as regards water pump,take the thermostat out put water in and start the engine follow the water circulation when you rev.if it rotates the water pump is working if is steady and coming upwards to over flow then the water pump is faulty. Also the other possibility is the matrix to be clogged..

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Mate.The powerhead(engine block) is clogged.Don,t run it anymore untill its cleaned out or the motor will cook.Take the heads off 1st and see whats in the water jackets.It will probably be blocked.A build up of white 'gunk' is the main indicator.If thats the case,a complete cleanout is needed.Hope this helps

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U CAN DISCONNECT THE OIL RESOVIOR SWITCH THAT TAKE IT OUT OF SAFE MODE BUT IM LEANING TOWARD THE POWER PACK

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8hp yamaha runs hot


In most outboards, it will flow through the prop itself (through the inner prop). There should be a stream of water coming from somewhere around the back end of the motor itself, called a telltale, which visually shows that the water pump inside the outboard is pumping water up around the motor. If you cannot see this, then there is obviously a problem with the water pump or pump impeller that needs to be corrected to prevent the outboard overheating.

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thermostat on the gas valve needs to be replaced,, which you will probly have to change the hole gas vale ,, check on the parts and labor and if it is over 6 years old wheigh the diffrence between it and a new unit good luck

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does your have a grining noise? if not its the thermostat.

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1 Answer

Boiler overheating


the problem there a relay stuck or thermostat bring on the pump & you can lower your high limit aquastat!! also the flow valves can bypass hot hot water risers time to put in a seperate water heater domestic coil are not energy efficient !!!! aquastat high limit set @ 180f deg low limit set @ 140f deg!!!
good luck!!! tim

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