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Remove lower unit ,remove impeller inspect replace if damaged,these impellers are normally changed at yearly service interval! check replace gaskets if necessary
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Random water pumping or intermittent water pumping, appears to be quite a commonality with the Grundfos pump. The solution to this is quite a bit of process, the details of which you can get here... http://inspectapedia.com/water/Intermittent-Water-Pump-Cycling.php
I have also attached a video, trust that gives you a bit more insight.
The easiest visual test to see if your motor is pumping cooling water is that the water will come out the "check hole" just below the engine bonnet.
However. it's possible that the check hole has become clogged with debris. A piece of thin wire or even a toothpick should be enough to get the debris loosened so water will flow.
You can buy "ear muffs" at any chandlery to hook your motor up to a garden hose for your test.
WARNING!
If steam is coming out of the hole, SHUT THE MOTOR DOWN IMMEDIATELY! You'll overheat the motor and cause a very spendy repair job.
Assure that the o ring is positioned onto the multi-port throat correctly. That could cause dirt to recycle into the pool water.It could also be issues with the multiport valve in the pool filters.
you most likey reversed the wires or you hooked up the sand filter pipes backwards try reversing the pipes on the pump first. If that does not work try reversing the wires, however you will have to flush the pump before using again or you will damage the pump
hi obviously a fuel fault someware / when motors are winterised the fuel system is usualy emptied, this causes gaskets and diaphrams to dry out and split try it with the tank filler off /replace the diaphram in the carb and i am pretty shure that will solve the problem /nb / as this motor has stood for a time and does not do much work /outboards love work check the water pump impellor and put a spoonful of oil in a full tank of gas hope this helps merlin v12
Have you checked the water pump? Some motors have a heat sensor to keep you from destroying the motor as a result of overheating. Since you already bought parts, ask if your motor has a heat sensor. The only thing to cool the motor is the water pump.
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