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Old 19-12-2011, 01:31   #46
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Re: Impeller Greasing in Engine Water Pump ?

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Originally Posted by Artif View Post
You can wait for your high temp alarm to tell you your impeller is FUBAR if you want, personally I'd rather check it regularly.
I may have misled in my earlier post. I entirely agree that the impeller should be checked regularly; it's just that some posters seem to be suggesting that you should replace a good (inspected) impeller every year - it's that bit that seems not necessary to me.
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Old 14-03-2013, 05:20   #47
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Re: impeller greasing in engine water pump ?

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Next time you leave the boat, turn of the sea cock, open the water strainer, run the engine with fresh water (your shower) then give a good squirt of dishwashing liquid, before stopping the engine, now your salt water system is full of fresh water and you impeller will be fine. better still change it before you start the engine. They are cheap!!!
Thay're not that cheap! £20 for a bit of rubber.
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Old 14-03-2013, 06:17   #48
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Re: Impeller Greasing in Engine Water Pump ?

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Originally Posted by Wand View Post
I may have misled in my earlier post. I entirely agree that the impeller should be checked regularly; it's just that some posters seem to be suggesting that you should replace a good (inspected) impeller every year - it's that bit that seems not necessary to me.
The problem is you can't tell from inspection whether the rubber is just about to delaminate from the metal bushing. By the time the high temperature alarm goes off, the waterlock may be a puddle of molten plastic. Having had this happen to me twice, I'm firmly in the camp of changing them out each year. You can probably go for two years if you're really cheap.
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Old 14-03-2013, 07:09   #49
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Re: Impeller Greasing in Engine Water Pump ?

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Originally Posted by Ziggy View Post
The problem is you can't tell from inspection whether the rubber is just about to delaminate from the metal bushing. By the time the high temperature alarm goes off, the waterlock may be a puddle of molten plastic. Having had this happen to me twice, I'm firmly in the camp of changing them out each year. You can probably go for two years if you're really cheap.
You would be better off to save money on replacing parts that are still good and spending it on a waterlock built out of fiberglass that doesn't melt down

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Old 14-03-2013, 08:40   #50
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Re: impeller greasing in engine water pump ?

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Originally Posted by Don L View Post
I carry a spare impeller and know how to replace it. I also have temperature indication and alarms. So I have 3 indications that are available before the engine is getting into an overheat (I also don't normally push my engine hard for long times)

When my boat is laid up that seawater pump is flushed with fresh water and then with glycol.

Did a poll once and it isn't common to replace requarly and the number of people who have had their seawater impeller fall apart were a lot fewer than what gets talked about.

Not saying there is anything wrong if someone whats to replace theirs every year.
Only time I ever had one destroyed was on my diesel generator, and that was due to cutting it on and forgetting to open the seacock.

I did have a boat years ago with an Atomic Four in it and when I opened the pump housing to replace the impeller (due to an anemic amount of water coming out of the exhaust when I bought it) and found an impeller with only one blade left.
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Old 14-03-2013, 09:48   #51
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Re: Impeller Greasing in Engine Water Pump ?

I have read somewhere in my distant, hazy past that one should remove the impeller for the winter. Store it in a small container (not so small that the blades are bent) with fresh water.
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Old 14-03-2013, 11:56   #52
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Re: Impeller Greasing in Engine Water Pump ?

What always helps is to make sure that the feed hose towards the impeller pump comes from ABOVE the pump, even when the connection is UNDER the pump. This assures that a water column is present when you shut down the engine and thus there is water to lubricate the impeller during the next start. Everybody... yes everybody, that complained about short impeller life and I checked the install had this problem. The only other possibility is some damage on the inside of the pump housing that cuts into the impeller, or storing it for long periods installed in the same position in the pump. All is preventable.
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Old 14-03-2013, 11:58   #53
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Re: Impeller Greasing in Engine Water Pump ?

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Originally Posted by s/v Jedi View Post
What always helps is to make sure that the feed hose towards the impeller pump comes from ABOVE the pump, even when the connection is UNDER the pump. This assures that a water column is present when you shut down the engine and thus there is water to lubricate the impeller during the next start. Everybody... yes everybody, that complained about short impeller life and I checked the install had this problem. The only other possibility is some damage on the inside of the pump housing that cuts into the impeller, or storing it for long periods installed in the same position in the pump. All is preventable.
Good suggestion. I now have it added to my (multi-page) "to-do" list.
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