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Old 03-07-2021, 02:52   #1
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Impeller Veins Missing Inside Raw Water Cooled 5411

Impeller came apart, about 6 of 12 veins are unaccounted for. Do I need to find and remove them from the coolant system or did they pass through? Where would they likely be? Thanks.
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Old 03-07-2021, 03:13   #2
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Re: Impeller Veins Missing Inside Raw Water Cooled 5411

When it happened to me I pulled the raw water hose from the pump to the heat exchanger and found all of them either jammed in the elbow or stuck in the face of the tubes in the heat exchanger. I have read accounts of people pulling the heat exchanger and using wire to ream out the tubes.
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Old 03-07-2021, 03:23   #3
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Re: Impeller Veins Missing Inside Raw Water Cooled 5411

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When it happened to me I pulled the raw water hose from the pump to the heat exchanger and found all of them either jammed in the elbow or stuck in the face of the tubes in the heat exchanger. I have read accounts of people pulling the heat exchanger and using wire to ream out the tubes.
I've read similar but only concerning fresh water cooled engines.
If my veins didn't pass through, I suppose they'd likely get stuck at the thermostat. I should probably check the thermostat and flush the system in both directions with a water hose.
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Old 03-07-2021, 03:32   #4
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Re: Impeller Veins Missing Inside Raw Water Cooled 5411

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Do I need to find and remove them from the coolant system...?
Yes.

You don't want them causing a current or future blockage.

Fair winds,
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Old 03-07-2021, 04:01   #5
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Re: Impeller Veins Missing Inside Raw Water Cooled 5411

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Originally Posted by fox9988 View Post
I've read similar but only concerning fresh water cooled engines.
If my veins didn't pass through, I suppose they'd likely get stuck at the thermostat. I should probably check the thermostat and flush the system in both directions with a water hose.


I’ve gone hunting impeller vanes in a raw water atomic 4. Found one in the thermostat, one or two in the nipple on the mixing elbow, and the rest in the waterlift muffler.
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Old 03-07-2021, 04:08   #6
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Re: Impeller Veins Missing Inside Raw Water Cooled 5411

I have a raw water cooled Volvo MD7A. While I have not eaten an impeller (on that motor) it is fairly likely your cooling system has some other blockages due to buildups. If the exhaust manifold has not been off in memory it is worthwhile to remove it and clean out blockages from the manifold and engine passages as well. Read up on descaling.

So you get a twofeer, clean out rubber AND scale.

Good luck.
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Old 03-07-2021, 07:28   #7
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Re: Impeller Veins Missing Inside Raw Water Cooled 5411

Thanks for the advice.
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Old 03-07-2021, 08:20   #8
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Re: Impeller Veins Missing Inside Raw Water Cooled 5411

If there is an oil cooler, they often get stuck in there.
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Old 03-07-2021, 09:42   #9
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Re: Impeller Veins Missing Inside Raw Water Cooled 5411

It is an 11 horse power 2 cylinder engine.
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Old 03-07-2021, 10:24   #10
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Re: Impeller Veins Missing Inside Raw Water Cooled 5411

pull and end caps off your Heat exchange, you'll most likely find the remints of the veins in there. At least that were my ended up. Small bits probably passed thru and will never be found
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Old 03-07-2021, 10:48   #11
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Re: Impeller Veins Missing Inside Raw Water Cooled 5411

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pull and end caps off your Heat exchange, you'll most likely find the remints of the veins in there. At least that were my ended up. Small bits probably passed thru and will never be found
There is no heat exchanger. It's a raw water cooled Universal Diesel 5411. Thanks
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Old 03-07-2021, 11:23   #12
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Re: Impeller Veins Missing Inside Raw Water Cooled 5411

Why are these being called veins? They’re not tubes and we’re not mining.

Vanes!!!
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Old 03-07-2021, 11:33   #13
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Re: Impeller Veins Missing Inside Raw Water Cooled 5411

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Why are these being called veins? They’re not tubes and we’re not mining.

Vanes!!!
I stand corrected
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Old 03-07-2021, 11:52   #14
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Re: Impeller Veins Missing Inside Raw Water Cooled 5411

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Why are these being called veins? They’re not tubes and we’re not mining.

Vanes!!!
OOPS ! Me too
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Old 03-07-2021, 14:48   #15
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Re: Impeller Veins Missing Inside Raw Water Cooled 5411

Showing off ones good spelling is just veinity!

Oops, VANEity.
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