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Old 07-03-2016, 19:30   #16
RDW
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Re: Impeller Lube

Anybody just used a silicone impeller? They are advertised as run dry impellers that resist breaking apart with short dry runs.
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Old 07-03-2016, 19:53   #17
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Re: Impeller Lube

the impeller is only a couple bucks. I just replace it every year. I use some hand soap to lube it. Been fine for years.
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Old 07-03-2016, 23:09   #18
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Re: Impeller Lube

Frankly, I'm astonished at the replacement schedules posted above!!!

OUr raw water pumps have always been bog standard Johnston pumps, and the impellers last around a thousand hours before starting to shed vanes. So, I replace them at around 900 to 1000 hours... or if I forget, when the water ceases to flow!

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Old 08-03-2016, 04:18   #19
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Re: Impeller Lube

Quote:
Originally Posted by Jim Cate View Post
Frankly, I'm astonished at the replacement schedules posted above!!!

OUr raw water pumps have always been bog standard Johnston pumps, and the impellers last around a thousand hours before starting to shed vanes. So, I replace them at around 900 to 1000 hours... or if I forget, when the water ceases to flow!

Jim
agree... but they are like $5 each. In the last 7 seasons, I had 2 impellers fail (broken or torn blades) after leaving them in over the winter. I think the blades just don't like to be left bent over a period of time.

They are the least expensive part on the boat. If it comes out for inspection at the end of the year, it doesn't go back in.

I think if it were run more often it would last longer.

It is just part of my winterization. right after I change the oil and filters, I pull the impeller and o-ring and toss them. I leave a new one near the motor to install in the spring.

There are still people who change the oil in their cars every 3,000 miles, even though the interval is now 10-12,000 miles. At least the impeller is a lot less expensive than that!
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Old 08-03-2016, 06:22   #20
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Re: Impeller Lube

Quote:
Originally Posted by Jim Cate View Post
Frankly, I'm astonished at the replacement schedules posted above!!!

OUr raw water pumps have always been bog standard Johnston pumps, and the impellers last around a thousand hours before starting to shed vanes. So, I replace them at around 900 to 1000 hours... or if I forget, when the water ceases to flow!

Jim
My experience as well

I use from silicone mask stuff, from a dive shop. $6 can will outlive me
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Old 08-03-2016, 06:36   #21
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Re: Impeller Lube

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Originally Posted by CS Cruiser View Post
Glycerin is what you want for that, get at drug store cheap compared to marine store under a different label.
Yep, that will work.

I think the lubricant is more for getting the impeller installed than anything else.
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Old 08-03-2016, 06:39   #22
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Re: Impeller Lube

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Originally Posted by Dockhead View Post
............A bit of Googling shows that neither KY nor Astroglide is silicone based, which surprised me. .........
Considering that it's intended to be inserted into the human body, that wouldn't surprise me.
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