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Old 03-06-2020, 14:31   #1
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Impeller Implosion

This was a brand new impeller (replaced beginning of the year) and it was the first time the engine was started up.

I think I forgot to put in some dish soap to lube things up when running dry to prime the pump, but still!

https://i.imgur.com/ImRRfsR.jpg

No issues, just a crazy picture. I think the impeller must have been left exposed to UV light or some kind of solvent or something.

Yes - hose fittings probably need replacement for that pump. I need to find ones that will work.
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Old 03-06-2020, 15:16   #2
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Re: Impeller Implosion

Are you sure that was the correct impeller?
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Old 03-06-2020, 15:29   #3
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Re: Impeller Implosion

Wow, that's ugly! Maybe just an old impeller?
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Old 03-06-2020, 15:43   #4
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Re: Impeller Implosion

looks like somebody took a blowtorch to it
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Old 03-06-2020, 16:50   #5
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Re: Impeller Implosion

Waterproof grease the housing and end plate. It also makes a tighter seal so the pump has more suction the first start on a new impeller.
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Old 03-06-2020, 17:01   #6
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Re: Impeller Implosion

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Originally Posted by Lepke View Post
Waterproof grease the housing and end plate. It also makes a tighter seal so the pump has more suction the first start on a new impeller.
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Old 03-06-2020, 17:31   #7
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Re: Impeller Implosion

Yup definitely the right impeller!

By "brand new" I mean I bought it online so who knows how old the thing really was! Definitely was packaged as if it was unused.
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Old 03-06-2020, 18:58   #8
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Re: Impeller Implosion

You may/probably already know this but the cover plate gasket thickness is critical, assuming it isnt an o-ring sealed cover.
Too little clearance & no lube could possibly cause that but...
That's a spectacular fail, certainly looks like the compound has suffered some sort of an adverse reaction.
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Old 03-06-2020, 19:12   #9
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Re: Impeller Implosion

Better check downstream. Bits may be in your heat exchanger. Better off finding out now rather than trying to diagnose a heating issue in some remote location.
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Old 03-06-2020, 19:59   #10
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Re: Impeller Implosion

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Better check downstream. Bits may be in your heat exchanger. Better off finding out now rather than trying to diagnose a heating issue in some remote location.
Dead right. By the look of it you could almost guarantee that bits of it are in the heat exchanger.
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Old 03-06-2020, 20:43   #11
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Re: Impeller Implosion

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Dead right. By the look of it you could almost guarantee that bits of it are in the heat exchanger.
I wonder! If it failed on its first few revolutions as described, then there was never any flow of water to flush the bits into the HE.

Likely a good idea to check, but I'd not be surprised to find it empty (at least from this impeller).

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Old 03-06-2020, 21:09   #12
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Re: Impeller Implosion

The long serpentine rubber part that crosses almost horizontally looks to be the body that was stripped from the cog that fits over the pump shaft. The blades could have been chewed up as it separated. Not too unusual for individual blades to separate on a failing impeller, but I've never seen the body around the cog separate/disintegrate like that.
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Old 05-06-2020, 10:24   #13
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Re: Impeller Implosion

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Dead right. By the look of it you could almost guarantee that bits of it are in the heat exchanger.
It actually exploded so quickly no water was able to get pumped through the system. I kinda pieced it back together and it seemed to all be accounted for. There's a chance there's a small part somewhere, but I haven't been having any issues with heat or waterflow

Boat was actually on the hard and no water came out the exhaust (I was supplying the pump with water of course through a hose) which was the dead giveaway that something was wrong.
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Old 05-06-2020, 10:30   #14
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Re: Impeller Implosion

I got stupid last year and ran the boat for at least 5 min at idle with the seacock closed.
No damage, there was water in the pump I’m sure but no water flow. This is a stock Yanmar impeller, not any kind of special dry run impeller.
Makes one wonder if the ones that have problems if the pump is above waterline line and drains dry after every shutdown.
Something jammed that impeller I believe, like maybe the blades were bent backward and with no lube they stuck hard enough so the the inner liner was peeled away? Or the liner was only partially bonded to begin with?
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