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Old 16-06-2014, 18:41   #1
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recovering broken impeller

Hi All,
Last year, I ran the engine without water by accident for few minutes, and I believe that impeller in the water pump had some pieces fractured, and moved the cooling system.
Is there a way to remove these pieces, and where I should look for them.
The engine is Yanmar 2QM15.
Thanks,

Andy
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Old 16-06-2014, 18:52   #2
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Re: recovering broken impeller

The heat exchanger would be the first and perhaps the last place to look. Do you have one of those stupid sounding "cuff" things? Beware!
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Old 16-06-2014, 19:08   #3
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Re: recovering broken impeller

Yes, probably the heat exchanger; very small needle nose pliers or surgical clamps can be very handy. I also have some dental picks, but you have to spear the rubber with those and very carefully drag it to where you can grab it with the clamps.

PS: if you still have the rest of that impeller, match up what you find and keep looking until you have all the pieces.
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Old 16-06-2014, 19:25   #4
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Re: recovering broken impeller

Small pieces might go through the heat exchanger and lodge in the mixing elbow.
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Old 16-06-2014, 20:25   #5
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Re: recovering broken impeller

Good periodic maintenance anyway to inspect and clean heat exchanger.
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Old 16-06-2014, 20:56   #6
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Re: recovering broken impeller

Be sure and look in the other direction. The pieces can fall down. I looked thru everything forward, down stream only to find the pieces in full view up stream.
rdw
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Old 17-06-2014, 03:54   #7
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Re: recovering broken impeller

On my boat the impeller bits get trapped at the inlet to the first impeller.

On my boat the easiest / fastest way to collect the bits is to reverse-flush the cooler.
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