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Old 26-08-2010, 18:11   #16
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Do people feel winter anti-freeze lay up effects the time between changing?

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Old 26-08-2010, 18:49   #17
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Goodness! We have been going through these things about every 6-9 months.
What could be causing such a regular failure do you think??

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Old 26-08-2010, 19:02   #18
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A hundred hours? The engine will only run four days before a breakdown is imminent? Surely that is wrong. 1000 seems about right. Or once a year.
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Old 26-08-2010, 19:05   #19
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annk, I don't know where you are but if you have a lot of silt in the water where you boat, or if you are in shallow sandy water and the sand gets stirred up, that could be the answer.
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Old 29-08-2010, 21:48   #20
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I replaced the impeller this morning. It had been in for eight years but had only done a few hundred hours.
The impeller was visually indistinguishable from a new one, so it will go into the spares container.
Interestingly, the pump cover plate ( and also the plate behind the impeller ) had the profile of a couple of impeller vanes etched into it to the depth of about .015".
It looks like it has been stopped at that position for a while and corrosion has taken place. I had rydlyme in it for a couple of hours last week (see another post) but I doubt that would have caused it.
Was able to flip the cover plate but can do little about the plate behind.
Will see how it goes.
Thanks again for all your input.
Regards, Richard
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Old 30-08-2010, 07:26   #21
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Annk, Some good hypotheses for your dilemma from DeepFrz and Boden36 above. I'd pay particular close attention to any anomolies within the seat of the impellor. Maybe the cam has a burr or fastener sitting proud or something irregular on the coverplate or the gasket. Take care and joy, Aythya crew

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