Re: tell tale output very sparadic at high speeds
all good suggestions, however ones i had previously thought of. Since we tried sitting still in the water and increasing the revs on the engine and the problem still occurred it was not to do with the water intake rising above the water as we checked it. The impeller is installed correctly, we pulled it out and checked it and all was fine and as for the wind it was not windy when we tested.<br /><br />So, at out wits ends we ripped the leg off again and took out the water pump housing and the base it sits on and we discovered a small gap where it should seal between the piece that sits on top of the vertical shaft bearings and where the exhaust gas flows back down past the bearing housing in the gearbox. We think this would allow exhaust gas to get sucked into the water intake when the exhaust gas pressure increases and the suction from the impeller also increases. So maybe exhaust gas was getting into the water intake. We have rebuilt the leg where it was not sealing properly and reinstalled everything, only thing left to do now is test it. Just waiting for some of the gasket goo to set so in about half an hour we should know if that was the problem...<br /><br />thanx again for all the good suggestions.
