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  #1  
Old 05-08-2012
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Storing impellers

I just chewed up a brand new impeller that I installed two weeks ago and ran for a total of an hour. Every single blade broke, although, much of that could have happened post failure, due to the heat that built in the pump. We were motoring out, noticed excessive exhaust smoke and shut down. I have a pic, but not on this iPad.

I did have some yard work done between the one run I made and this failure. They changed fuel filters for me and, since I always close the raw water seacock, I wondered if they ran her dry when they bled the system.

Of course, they deny it, as I expected. I will never know for sure.

The only remaining potential is that the impeller dried out. It was on a shelf in the engine compartment for about 9 months. I always keep a spare aboard and use it to commission in the spring and buy another spare. Not much use as a spare, if it fails in an hour.

I've heard of people keeping their impellers packed in glycerin or oil. I never have.

How do you store yours?
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Old 05-08-2012
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Re: Storing impellers

When I take mine out for the winter, I coat it with petroleum jelly. Never thought to do this to a new impellor being saved as a spare.
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Old 05-08-2012
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Re: Storing impellers

Petroleum products can attack the rubber. If you want to store it in something, use olive oil or silicone grease.
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Old 05-08-2012
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Re: Storing impellers

Don't know about storage, I just store mine as it comes and they always seem to work fine. I would guess the overheat buzzer would have gone off for the mechanics. Although I was talking to someone at my boat yesterday meanwhile his was overheating and buzzing away and it was directly in front of mine and neither of us heard it...so you never know.

Anyway, I made a large laminated tag that I snap to the ignition key that says open seacock. I snap it on whenever I close the valve for whatever reason. It's mainly for myself but it also serves for purposes such as this. Just a thought.
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Re: Storing impellers

You also have to wonder how long that impeller has been 'on the shelf' at the vendor. I do suspect that these bits can 'dry out' in time and become somewhat more brittle than they were when new. I think the same applies to other rubber parts like heat exchanger boots etc.
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Re: Storing impellers

I had the same results with an impeller, luckily all rubber parts ended up before the heat exchanger. I suggest using either glycerin or talcum powder for spare storage, and/or vacuumpack individually.
I also had the same problems with belts. I went through two belts in one day, that were stored on board for over a year. They both delaminated.
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Re: Storing impellers

Quote:
Originally Posted by Minnewaska View Post
I just chewed up a brand new impeller that I installed two weeks ago and ran for a total of an hour. Every single blade broke, although, much of that could have happened post failure, due to the heat that built in the pump. We were motoring out, noticed excessive exhaust smoke and shut down. I have a pic, but not on this iPad.

I did have some yard work done between the one run I made and this failure. They changed fuel filters for me and, since I always close the raw water seacock, I wondered if they ran her dry when they bled the system.

Of course, they deny it, as I expected. I will never know for sure.

The only remaining potential is that the impeller dried out. It was on a shelf in the engine compartment for about 9 months. I always keep a spare aboard and use it to commission in the spring and buy another spare. Not much use as a spare, if it fails in an hour.

I've heard of people keeping their impellers packed in glycerin or oil. I never have.

How do you store yours?
We keep two spares (not in the engine compartment which get too hot!). I wipe our newly purchased spare down with the glycerin tab that comes with the impeller, wrap it in wax paper and vacuum seal it in a plastic pouch with our FoodSaver and put the date on the pouch with a marker. We replace the impeller at 100 hour intervals, or one year, whichever comes first, with the oldest spare and buy a new one. Never had a failure.

As others have noted, do not use a petroleum based lube.

FWIW...
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Re: Storing impellers

I practice the rotating inventory method exactly and replace the impeller at least annually. Always during Spring commissioning and again if hours suggest. The only other I've ever had fail was many many years ago, when I was less diligent. I've never had a brand new one fail, although, I have heard of it happening.

I am also suspect of the age of the impeller when I received it. How would one know.

I would rather not use the included glycerin pack for storage, as I would like to use it when it comes time to install. I particularly like to squeeze it right between the blades, after its been installed, to insure a seal for priming.

Spray with silicon spray maybe?
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Re: Storing impellers

EVOO works great.
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Re: Storing impellers

Quote:
Originally Posted by GrumpyPawPaw View Post
EVOO works great.
I've heard of the idea. Sounds pretty weird and worry that the food oil goes rancid.
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