Impeller choice?

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UserError
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Impeller choice?

Post by UserError » Tue Oct 24, 2017 6:05 pm

Hello,
I will be inspecting then changing the impeller on our MD11c shortly. (I understand it is best to remove it during lay up?) as I want a new one to start the new season with and ours has been undisturbed for maybe two years.

What names/brands are OK? Is it wise to stick with Volvo & pay their £35, or are CEF OK at almost a third of the price? Or anywhere in between - reliable sources? Also, where do Jabsco fit in? I know they've been around forever - do they make aftermarket parts, I'm a bit confused?

Many thanks
Jonathan
Centaur Polly B
Littlehampton

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philipstevens
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Re: Impeller choice?

Post by philipstevens » Tue Oct 24, 2017 7:04 pm

Have a look at ASAP-Supplies. https://www.asap-supplies.com/pumps/impellers
regards,
Philip.
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Re: Impeller choice?

Post by Nigel Birch » Tue Oct 24, 2017 7:15 pm

I like to run some anti freeze through the engine before I shutdown for the winter. So I always change the impeller in the spring.
Nigel
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Re: Impeller choice?

Post by Willhc » Tue Oct 24, 2017 9:58 pm

I believe (probably incorrectly) that Jabsco makes the water pump on the MD11C. I carry Jabsco impellers as spares for mine. ASAP has the part match. Personally I go for the approach of change every year, and anything could have a failure on day one so is it really worth the extra £15 for VP branding on what is probably the same underlying part?

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Re: Impeller choice?

Post by philipstevens » Tue Oct 24, 2017 11:25 pm

Some VP's had Jabsco pumps, and some had Johnson pumps. Have a look on the cover plate to find out what make and model you have.

If you look on https://www.marinepartseurope.com/en/default.aspx you will be able to see which make/model yours should be.
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Re: Impeller choice?

Post by UserError » Wed Oct 25, 2017 1:04 pm

Philip. Thanks for the link to ASAP and the clarification on the pumps.
I had been on the marineparts site and wasn't quite sure what I was looking for, as there are 3 pumps and superceded parts etc. Looks like I can't get one in advance of my next visit and that I'll have to try & identify it whilst out there.

Nigel, that sounds like a reasonable plan, but not what I need to do now: The boat has been afloat untended for maybe 2 years. The non-boaty seller had a boat-owning friend who handled the sale. He started the engine, but after a while the water flow from the exhaust reduced. The easy answer is marine growth in the intake, but the impeller isn't going to be in great shape so needs investigating anyway - and may be disintegrating. So I plan install a new one & do our familiarisation trips and move with it, and if we run out of time and we can't move her till spring, I'll take the impeller out.

We are looking to move her from Emsworth to Littlehampton so have a number of tides to deal with and need the engine to be as reliable as I can get it (whilst out on the swinging mooring).

With regards to the impeller make, Jabsco seems a reasonable compromise - cheaper than VP but a known quality rather than a cheap CEF one.
Thanks
Centaur Polly B
Littlehampton

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Re: Impeller choice?

Post by TyroSailor » Fri Oct 27, 2017 3:10 pm

If the boat's been unused for two years the impeller will have developed a 'set' with the compressed vanes having permanently adopted their distorted shape. Running the engine with it like this risks them breaking off and bits finding their way into and blocking the heat exchanger (if you have one) or the engine waterways. It's for this reason (my engineer told me the other day!) that the impeller should be removed as part of a winter lay-up. And likewise the alternator belt.
Experience: That which would have been most useful five minutes before you acquired it.

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at Southampton

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Re: Impeller set

Post by UserError » Sun Jan 21, 2018 9:27 am

Yep.
If any other newcomers are wondering, or are in two minds about whether to change the impeller, this is what the 'set' deformation looks like:
IMG_20180120_150633092.jpg
Deformed vanes
IMG_20180120_150633092.jpg (19.32KiB)Viewed 1243 times
Centaur Polly B
Littlehampton

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